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Income Tax CalculatorPopularPersonal income tax by the latest Bangladesh slabs, with investment rebate and minimum tax Pay Fixation 2026 (New Pay Scale)PopularFixation in the 2026 scale per the Services (Pay and Allowances) Order 2026, the 1 July 2026 increment, phased payment and arrears Gazetted Officer Arrear Bill (T.R. 13)NewJuly–September 2026 pay-scale arrears on the official T.R. 13 form, with special-benefit and excess-HRA adjustments Monthly Salary Calculator (2026–28)Phased basic, frozen allowances and the 2028 rates — gross and net monthly pay with a period-by-period comparison National Pay Scale 2026 TableNewEvery step of all 20 grades in the 2015 and 2026 scales, amount search, and step-by-step 2015 → 2026 fixation Pension Revision 2026 (Existing Pensioners)NewNew net pension from the 30 June 2026 net pension under the para 8(1)(kha) slabs, increment and phased payment New Allowance Rates (2028)NewHouse rent, medical, education, tiffin, conveyance and mobile allowances at the rates effective 1 January 2028 Pension & Gratuity CalculatorMonthly pension, lump-sum gratuity and allowances from service length & last basic (as fixed in the 2026 scale)GPF / CPF CalculatorYear-by-year provident fund balance from monthly subscription and slab-based profit Earned Leave CalculatorFull-pay and half-pay earned leave accrued and remaining under govt rules Retirement & PRL DatePRL start, retirement date, service length and days remaining from date of birth Job Age Limit CheckerYour exact age on the circular's cut-off date and whether you qualify Loan Instalment (EMI) PlannerMonthly instalment, total interest and full amortization schedule DPS CalculatorMaturity amount from monthly deposit, tenure and profit rate FDR & Sanchayapatra CalculatorFDR and family/pensioner savings certificate profit and maturity VAT CalculatorPrice with/without VAT and the VAT amount at 15% or any rate Zakat CalculatorNisab check and zakat due from cash, gold/silver, trade goods minus debts Interest CalculatorSimple and compound interest with total profit and final amount Currency ConverterLive rates for BDT to USD, SAR, MYR, GBP and 150+ currencies Electricity Bill CalculatorNewYour monthly bill from the fans, lights, fridge, AC and other devices in your home, or from meter units — on the current slab rates (editable), with demand charge, VAT and each device's share Percentage CalculatorPercent of, discount, increase/decrease — every percentage calculation Figures into WordsPopularAmounts in Bangla and English words — for cheques, vouchers and deeds Bangla ↔ English NumeralsConvert digits in any text between Bangla and English numerals Old Bijoy Text into UnicodePopularConvert SutonnyMJ (Bijoy) text to Unicode and back Tidy and Count TextWord/character count, case change, dedupe lines, sort, find & replace Unit ConverterLength, weight, temperature, volume and data unit conversion Build a Strong PasswordStrong, secure passwords — choose length and character types Type Bangla with English SpellingPopularType in English letters and get Bangla instantly — the familiar Avro-style key map with conjuncts and reph; nothing to install OCR: Scan to Editable TextNewRead Bangla and English text from photos or scanned PDFs into editable text, TXT or Word — in the browser One Date, Every CalendarNewOne date in 20+ formats — English, Bangla digits, Bangabda, Hijri; convert a whole list at once to CSV Translator (18 languages)NewInstant translation between Bangla, English, Hindi, Arabic, Urdu, Malay and 13 more — offline in Chrome when the language pack is installed Bangla–English–Hijri DateAny date in Bangla, Gregorian and Hijri calendars; dual dates for office letters Work Out an AgeExact age in years-months-days, total days and next birthday Day Counter & Date MathDays between two dates (incl. working days) and add/subtract days from a date Holiday Calendar & Long-Weekend PlannerNew2026 holidays for three kinds of institution — government offices (the gazette's general, executive-order and optional days) and schools and colleges (the education ministry's own lists, with the Ramadan, summer and winter vacations). Plus a countdown, month grid, bridge-day planner and phone-calendar export Write a Leave ApplicationNewCasual, earned, medical and maternity leave applications — fill in and print or save as PDF Notices for Schools & OfficesNotices and announcements for a school, college, society or private office, with heading, memo number, subject, distribution and copies. A government office's forms differ — those are in Official Letters & Memos Envelopes & Address LabelsNewSender and recipient printed straight onto the envelope — DL, C5, C6, C4, 9×4 inch or your own size; or 24, 21, 14 or 8 labels on an A4 sticker sheet. Paste many addresses and they all print in one pass, in Bangla or English Official Letters & MemosNewOfficial letters, memoranda, office orders, circulars, D.O. letters, U.O. notes, notices and notifications on the Secretariat Instructions 2014 forms — salutation, courtesy and recipient placement follow the type Design an Award CertificateNewParticipation, achievement, training, appreciation and merit certificates — four designs, your own colour, logo, seal and signatures; paste a list of names and every certificate prints in one go Write a CertificateNewEmployment, character, experience certificates and NOC letters Bill, Voucher, Receipt & QuotationSix documents — expense voucher, cash memo, invoice, money receipt, quotation and delivery challan; VAT, AIT at source, BIN, revenue stamp and the amount in words Lay Out a CV or BiodataNewClean, ATS-friendly CV in Bangla or English — print or PDF Family Card ApplicationNewApplication to the ward member, councillor or UNO for a subsidised-goods family card — with member list and office-use box; print/PDF/Word Fuel Allocation ApplicationNewApplication to a dealer, chairman or UNO for diesel/octane for pumps, tractors or generators — with machinery list and approval box Résumé Screening Software Can ReadNewSingle-column résumé without photo or needless personal details, so applicant-tracking software parses it correctly; print/PDF/Word Document Scanner (phone camera)NewPhotograph a page, straighten the edges, clean away shadows and yellowing, and merge several pages into one PDF Presentation MakerNewImport pictures and video, build slides from an outline, present fullscreen — tables, big-number slides, speaker notes; export PowerPoint (.pptx) or 1/2/4/6-up handouts Banner & Poster DesignerNew12 ready templates (opening, admission, circular, mourning, milad, Eid, Puja) — round guest portraits, two logos, your own colours, plus bleed and crop marks for the press Notes & To-doNewOffice notes, meeting points or personal lists — auto-saved, colour-coded, pinnable, searchable, exportable to Word or text Job CircularsNewLatest government, bank, NGO and forces circulars in one place — filter by type or district, with links to the official application portals Image to PDFCombine JPG/PNG images into one PDF — choose page size and margins Combine PDFs into OneJoin multiple PDF files into one — reorder as needed Break a PDF ApartExtract page ranges or split every page into its own file Organize & Rotate PDFRotate, delete and reorder pages Slim Down a PDFPopularShrink scanned PDFs to fit upload size limits Save PDF Pages as PicturesConvert each PDF page to a JPG or PNG image Both Sides of an NID on One PagePopularNID, smart card or licence front & back on one page at true size PDF Password: Set or RemoveNewPut an AES-256 password on a confidential file, or strip a known password to make an open copy — all in the browser PDF Print & Copy ControlNewDecide who may print, copy, edit or comment — locked behind an owner password Stamp & Watermark PDFNew"DRAFT", "CONFIDENTIAL" or your logo — diagonal, centred or tiled; Bangla text renders perfectly Pull Images out of a PDFNewEvery embedded picture at original quality as JPG/PNG — one by one or as a ZIP Change PDF Page SizeNewLetter to A4, A5 to A4 or any custom size — vectors intact, text stays crisp Trim PDF MarginsNewCut wide white margins or dark scan edges — auto-detects whitespace, makes phone reading easier Lift a Table out of a PDF into ExcelNewPay bills, result sheets or statements to .xlsx/CSV — Bangla digits become real numbers Fix a Broken PDFNewWon't open, cut-off download or xref error — rebuilds the structure, or recovers pages as images Number the Pages of a PDFNew1, Page 1, 1/10 or your own wording — Bangla, English or Roman digits in any of six spots; skip a cover, mirror for double-sided printing Flatten a PDF's Forms & CommentsNewMake typed form answers, highlights and comments part of the page so they can't be changed on their own — or turn whole pages into images Make a Scanned PDF Searchable (OCR)NewAn invisible Bangla and English text layer over image-only PDFs — search, copy and screen readers work, and the scan itself is untouched Read & Search a PDFNewRead books, gazettes or notices — search the text, zoom, jump through the contents, night mode, full screen; it remembers where you stopped Black Out Private Details in a PDFNewFind phone, NID, email or names, or draw boxes by hand — the covered text is removed from the file itself, not just hidden Write On & Edit a PDFNewAdd text, fill in printed forms, place pictures and logos, white out mistakes and type over them, draw lines, arrows and ticks — Bangla stays perfect Sign a PDFNewDraw it, type it in a handwriting style or use a photo of your paper signature, then place it — on every page if needed; office seals, dates and ticks too Comment On & Highlight a PDFNewHighlight, underline or strike out text, draw, add arrows and boxes, leave comments — they show, and stay editable, in Acrobat and other readers Fill In a PDF FormNewType into a fillable form's boxes, tick them, choose from lists — Bangla answers print properly; no boxes? type anywhere Application Photo and Signature to SizePopular300×300 photo (≤100KB) and 300×80 signature (≤60KB) for govt job applications Process Many Photos at OnceNewOne recipe over hundreds of photos — turn, centre-crop, resize, convert, cap the KB and rename — in a single pass in your browser, delivered as one ZIP Slim Down a PhotoReduce image size to a target KB while keeping quality Set a Photo's DimensionsResize by pixels or percent and crop to a fixed ratio Make a Passport-Size PhotoNewCrop to the Bangladesh e-passport 40×50 mm size — or passport, stamp or visa size — and lay out 4/8/12 copies on a print sheet Change a Photo's FormatJPG, PNG, WebP — convert between formats, with background colour Draw Your SignatureSign with mouse or finger and save as transparent PNG Make a QR CodeQR codes for links, text, phone, Wi-Fi or vCard — PNG/SVG Make a BarcodeBarcodes in CODE128, EAN-13, UPC and more Cut Out the Background (on-device AI)AIIsolate people, products or logos into a transparent PNG or a white/colour background — model downloads once, then works offline; nothing is uploaded Crop Any Part of a PhotoNewDrag a box to cut any region — free-form or fixed ratios (1:1, 16:9, passport, cover)Watermark PhotosNewAdd text or a logo — position, opacity, angle; batch-stamp many photos into a ZIP Flatten Transparent ImageNewGive a transparent PNG logo or signature a white (or any) background and export JPG — no more black boxes on forms Colour Code from ImageNewClick for HEX, RGB, HSL, CMYK; dominant-colour palette; pick from anywhere on screen Signature from Typed NameNew18 handwriting styles (Bangla & English), ink colour, slant, flourish — transparent PNG or JPG Recolour a LogoNewSwap one colour of a logo or icon for another while keeping shading and edges — or tint the whole thing Shrink a GIFNewFewer colours, fewer frames, smaller size — much lighter GIFs for stickers, chats and websites Passport Pages to A4 PDFNewCrop bio and visa page photos to international size on A4 — for visa, bank and office submissions Reduce Video SizeNewMake phone videos several times smaller for WhatsApp, email or uploads — pick the quality, all in the browser Cut a Video ClipNewKeep just the part you need by start/end time — frame-accurate or a seconds-fast cut Join VideosNewSeveral clips into one video in order — no re-encoding when they come from the same camera Pull the Sound out of a VideoNewSave the sound of a lecture, song or meeting as MP3, M4A, WAV or OGG Brand a VideoNewOverlay your logo or © text — corner, opacity and size of your choice; Bangla text works Adjust Video VolumeNewBoost a faint recording or tame a loud one — in dB, with optional auto-levelling Speed Up / Slow Down VideoNewFrom 0.25× slow motion to 4× fast — audio pitch preserved Turn a Clip into a GIFNewA palette-optimised GIF from a few seconds of video — choose size, fps and dithering Rotate or Flip VideoNewStraighten sideways videos — 90°, 180°, mirror — plays correctly in every player Mute a VideoNewDrop the audio track for a silent video — no re-encoding, done in seconds Convert Video FormatNewMOV, MKV, WebM, AVI → MP4 (or back) — instant and lossless when the streams already match Board Result Finder & GPANewThe SMS format for results (16222), board codes and official links; GPA from a group's subject list (two-paper subjects graded together), target-GPA working, a printable marksheet, and university CGPA on the 4.00 scale Scientific CalculatorNewTrigonometry, hyperbolics, logs, powers, roots, factorial, nCr/nPr — a 2nd key for each button's inverse, M+/M−/MR memory, the answer as a fraction, a bracket-balance hint, and Bangla digits Maths ToolkitNewFractions, GCD/LCM, prime factors, quadratics and 2–3 unknown systems (with determinant and inverse), geometry (area, volume, litres), arithmetic and geometric series, statistics, number bases, percentages and ratios Question Paper GeneratorNewBTEB diploma finals, mid-terms and class tests in one press from 63,000+ ready questions across 480 subjects, picture questions included; SSC-style and your own layouts too — instructions and marks worked out Bloom's Taxonomy Question BuilderNewWrite questions from level verbs and templates, check what level a question asks for, and see how the marks are balanced Continuous Assessment CalculatorNewTC, PC and PF under BTEB Probidhan-2022 for a whole class — attendance marks, pass or fail and eligibility to sit the final; or your own scheme Lesson Plan GeneratorNewReady plans for every unit and practical job of each BTEB subject in one press — outcomes, timed phases, teacher and student activities, assessment; all editable; print or Word BTEB Digital ContentNewReady material for every Probidhan-2022 subject: unit slides (PowerPoint), lecture notes, question sets, glossaries, the syllabus, job sheets and a teaching schedule — preview, then save as PPTX, Word, PDF or Excel Prayer Times & QiblaNewFive daily prayers for all 64 districts, sehri and iftar, countdown to the next prayer, qibla bearing and a printable monthly timetable Weather ForecastNewCurrent temperature and feels-like for your district or location, 24-hour and 7-day forecast, rain chance and UV Cook With What You HaveNewTick what's in your kitchen and get full recipes you can cook now, with anything missing listed; Bangladeshi, Indian, Chinese and more Newspapers & Today's HeadlinesNewLatest headlines from Prothom Alo, The Daily Star and more on one page, plus direct links to 60+ papers and channels Daily Practical TipsNewBite-size advice on health, office life, digital safety, money, government services and correct Bangla — a new one each day Send Files Between Your DevicesNewMove photos, video, PDFs — any file — straight between your phone, laptop and tablet. Pair with a code or by scanning a QR; the files are never stored on a server, they go encrypted from one device to the other BMI & Healthy WeightNewBMI from height and weight, the healthy weight range for that height, and what your waist says — on the cut-offs set for South Asian bodies, where overweight starts at 23 rather than 25 Daily Calories & ProteinNewHow many calories a day your body needs, what to eat to lose or gain, and the protein, fat and carbohydrate behind it — shown in portions you actually eat How Much Water a DayNewYour day's water from weight, activity and the heat, counted in glasses — with a tally for today that resets by itself each morning Blood Pressure CheckerNewWhich band a reading falls in, what to do about it, and how to measure properly — with a log and a running average to show your doctor Blood Sugar & DiabetesNewWhere a fasting or after-meal reading falls, what an HbA1c says about the last two to three months, and mg/dL ↔ mmol/L Child Vaccination Schedule (EPI)NewEvery dose from BCG to MR dated from the child's birthday, with what has been given ticked off, what is overdue flagged, and the whole card printable Polytechnic Admission Form (1st Semester)NewFill the Board's 1st-semester admission form for Diploma-in-Engineering by typing — your own session, with a photo, downloaded as Word or PDF or printed straight off Muslim Inheritance (Faraid)NewShares for 29 kinds of heir under Hanafi faraid — who takes what, who is excluded and by whom, with awl and radd; exact fractions, and amounts in taka if you want them Hindu Inheritance (Dayabhaga)NewShares under Dayabhaga and the 1937 Act — the widow's limited estate and where daughters stand; India's 1956 Act does not apply in Bangladesh Christian & Other InheritanceNewShares for spouse, children and kindred under the Succession Act 1925, with the sections cited; sons and daughters take equally Land Unit ConverterConvert between shotangsho, katha, bigha, acre, hectare and square feet Khatian Share to LandNewTurn an ana-gonda-kora-kranti-til share into actual land, or work the share back from the land Whole Khatian AnalysisNewSeveral dags and several owners at once — each owner's land in every dag, their total, and whether the shares fill the record; printable Dividing a Dag Between SharersNewWhat each sharer in a dag takes, and whether all the shares add up to the whole plot Plot Area from Tape MeasurementsNewDecimal, katha and bigha from sides and a diagonal, a triangle, or an irregular plot — and how much the averaging shortcut overstates Bike Number Plate DesignerNewThe front plate BRTA now requires — live preview as you type, seen on your own bike, the 20 mm character check and a from-a-distance test; PNG, JPG, actual-size PDF, Word and an A4 print sheet Seller's Protection PapersNewWhen a buyer never transfers the vehicle, the fines and the summons keep coming to the seller — a signed handover acknowledgement, a notice to BRTA and a notice to the buyer, all three together Ownership Transfer ChecklistNewWhich paper is needed from whom before you go to BRTA, what a financed vehicle adds, ticked off and printable Bike Doctor — Motorcycle TroubleshooterNewPick your bike and the symptom; answer one question at a time for possible causes, safe checks and when to see a mechanic — with maintenance guides, a service log and a repair-cost estimate Used Vehicle Inspection ChecklistNewPapers, engine, chassis, brakes, electrics and history — thirty-odd checks, with the ones that end a purchase on their own marked separately Used Vehicle Value EstimateNewA rough figure from what it cost, its age, its condition and the work it needs — not a market price, somewhere to start bargaining Ownership Transfer TimelineNewFrom the purchase date: papers, affidavit, forms, submission and the new Blue Book, each with a date Sale Receipt & DeclarationsNewA receipt for the money, a seller's declaration and a buyer's — three separate papers, Word or print BRTA Form Data SheetNewEvery detail the forms ask for, entered once and printed to copy from — with the engine and chassis numbers spaced character by character so they are not miscopied Vehicle Sale AgreementNewA written agreement for a bike or car sale — both parties, the vehicle, the price and who carries which liability; Word or print Ownership Transfer AffidavitNewAn affidavit draft ready to print on stamp paper, in Bangla or English, to be sworn before a notary Bike & Car Ownership CostNewFuel, servicing, insurance, tax and parking as a monthly figure — with depreciation, the largest cost and the one nobody counts Fuel Cost CalculatorNewWhat a distance costs in fuel, or how far a budget takes you — range on a full tank, cost per kilometre Mileage CalculatorNewYour vehicle's real mileage from your own fill-ups — a quick one-tank check, or a full log with partial fills, monthly spending, city against highway and the maker's claim Trip Cost CalculatorNewFuel, tolls, parking and driver added up for the whole journey, and what each person owes Service Cost TrackerNewWhat was done, when, and what it cost — totals, averages, cost per kilometre, and a record worth showing a buyer Next Service ReminderNewDistance or date, whichever falls due first, and how much of either is left Tax Token Due Date & CostNewWhen the token expires, how many days are left or overdue, and the total with surcharge — the amounts come from BRTA's schedule, not from us BRTA Fee WorksheetNewEvery line a transfer bill is made of, including the hire-purchase withdrawal people forget, with VAT separated — amounts to be filled from the schedule Car & Bike EMI CalculatorNewThe monthly instalment with down payment, registration and insurance — the total interest, and what the vehicle really costs by the end GPA Calculator (SSC & HSC)NewGPA from subject grades or marks, applying the optional fourth-subject rule correctly — which most calculators get wrong CGPA & Semester GPANewCredit-weighted semester GPA and CGPA across semesters, on the 4.00 scale used by diplomas, polytechnics and universities Marks Needed for a Target GPANewWhat the remaining semesters or subjects must average to reach the CGPA you want — and says plainly when it is out of reach Word & Character CounterNewWords, characters, sentences and paragraphs, plus how long it takes to read or present — Bangla conjuncts counted as they appear Fraction CalculatorNewAdd, subtract, multiply and divide fractions, answered in lowest terms and as a mixed number; decimals convert too Ratio & ProportionNewReduce a ratio, share an amount out in it, or find the missing term of a proportion Average, Median & DeviationNewMean, median, mode, range and standard deviation for a set of numbers, population and sample both Quadratic Equation SolverNewRoots, discriminant and vertex of ax² + bx + c = 0, with the complex pair where there are no real roots Speed, Distance & TimeNewAny two of the three give the third, in km/h, m/s, mph or knots Ohm's Law & PowerNewAny two of voltage, current, resistance and power give the other two, with the units used per hour Physics FormulasNewThe formulas for motion, force, energy, electricity, waves and heat — searchable in either language, each with what its symbols mean Study Timer (Pomodoro)NewTwenty-five minutes of work, five of rest — lengths adjustable, and it remembers the day's rounds Exam Study PlannerNewHow many hours a day each subject needs, split by chapters and difficulty, with the nearest exam first OMR Answer Sheet MakerNewA printable multiple-choice answer sheet for any number of questions and options, in columns, with instructions Assignment & Lab Report Cover PageNewA printable cover page from the institution, course, student and teacher details — for assignments, lab reports and projects Citation & Reference GeneratorNewReferences for books, journals and websites in APA, MLA or Chicago, with the list sorted alphabetically Text ↔ ASCII, Binary & HexNewTurn text into decimal, binary or hex and back — and see how characters differ from bytes in Bangla Storage & File Size ConverterNewBytes to petabytes in both the 1024 and 1000 systems, plus how long a file takes to download IP & Subnet CalculatorNewNetwork, broadcast, mask and usable hosts from an address and prefix — and it names the prefix for a number of hosts Useful Govt LinksNID, passport, tax return, land, jobs, payslip — direct links to essential services IMEI Check & Handset DetailsNewCheck whether a phone or tablet's IMEI is well formed — check digit, TAC, serial and the marks of a made-up number — and build the KYD message that asks BTRC's NEIR whether the handset is registered Emergency Hotlines999, 333, 106, 109 and other national hotlines — tap to call AI Letter & Application WriterAIDescribe the situation; get a complete letter in polished Bangla or English — applications, job cover letters, government job applications, leave, resignation, school letters and more AI Translate & ProofreadAIBangla ↔ English translation and grammar/spelling fixes in an official tone AI Summarizer & Email WriterAISummarize long notices or reports; turn bullet points into professional emails Power Factor & CorrectionNewPower factor, kVA and kVAR from kW, voltage and current — and the capacitor kVAR to reach a target Cable Load & Voltage DropNewCurrent from the load, and voltage drop, percentage and cable loss for a length and size (mm²) — copper or aluminium Transformer CalculatorNewPrimary and secondary full-load currents from the kVA rating, and the turns ratio and secondary turns from the voltages Motor Power CalculatorNewInput and output kW, hp and torque from voltage, current, power factor and efficiency — or full-load current from the power Resistor Colour CodeNewPick the colours of a 4- or 5-band resistor for its value (Ω, kΩ, MΩ), tolerance and minimum and maximum values — per IEC 60062 LED Resistor CalculatorNewThe series resistor for LEDs from supply voltage, forward voltage and current — its power, the next E12 value and the current with it Voltage DividerNewOutput voltage from two resistors, or R2 for a wanted output — with the divider current and the power in each resistor RC & RL Time ConstantNewτ = RC and τ = L/R, the capacitor voltage at any time while charging or discharging, and the time to 63.2 % and practically full (5τ)555 Timer CalculatorNewFrequency, high and low time and duty cycle in astable mode, and pulse width in monostable mode — from R and C Alternator Frequency, Speed & PolesNewf = P × N ÷ 120 — frequency from poles and rpm, synchronous speed from frequency, or the number of poles needed Power Plant Efficiency & Heat RateNewOverall efficiency and heat rate of a thermal power plant from electrical output, fuel flow and calorific value — or the fuel needed at a given efficiency Torque CalculatorNewTorque from force and arm length (N·m, kgf·m, lbf·ft), shaft torque from kW and rpm, and power (kW, hp) from torque and speed RPM CalculatorNewDriven pulley rpm from the diameters, spindle rpm from cutting speed for lathe, milling and drilling (and back), and a motor's synchronous speed from frequency and poles Gear Ratio CalculatorNewGear ratio, output rpm and output torque (with efficiency) from the tooth counts — one gear pair or a two-stage compound train Belt Length CalculatorNewOpen or crossed belt length, angle of contact, belt speed and driven pulley speed from the two pulley diameters and the centre distance Pressure, Force & Hydraulic PressNewPressure (Pa, kPa, bar, psi, kgf/cm²) from force and area, force from pressure, and the ram force of a hydraulic press from plunger and ram diameters or areas Engine CC & Compression RatioNewEngine cc and litres from bore, stroke and cylinders, compression ratio from the clearance volume, and the clearance volume from a ratio Tyre Size CalculatorNewSidewall, overall diameter, circumference and revolutions per km from a marking like 185/65 R15 — and two sizes compared with the speedometer difference Road Speed & Engine RPMNewVehicle speed (km/h, mph) from engine rpm, gear ratio, final drive and tyre diameter — or the engine rpm at a given speed Concrete Mix CalculatorNewCement bags, sand and aggregate in m³ and cft for a concrete volume at 1:1.5:3, 1:2:4, 1:3:6 or your own ratio — with water Rebar Weight CalculatorNewWeight per metre and per foot from the bar diameter (d²/162), and the total in kg and tonnes for a number of bars and their length Brick CalculatorNewNumber of bricks (with joints and wastage), mortar volume, and bricks per m³ and per cft from a wall's length, height and thickness Mortar & Plaster CalculatorNewCement bags and sand (m³ and cft) for plaster by area and thickness, or for a mortar volume, at 1:4, 1:5, 1:6 or your own mix Beam Load CalculatorNewReactions, maximum shear force, bending moment and deflection of simply supported and cantilever beams under a point load or UDL — for study and checking Slope & Gradient CalculatorNewGradient as 1 in n, percent and angle from a rise and run or two reduced levels — and the rise for a given gradient Drawing Scale ConverterNewReal size from a drawing measurement, and drawing size from a real one, at 1:50, 1:100, 1:200, 1:500, 1/8″ = 1′-0″ or your own scale BTU to Ton & AC SizeNewConvert cooling capacity between BTU/h, tons (TR), kW and kcal/h — and the nearest common AC size for a heat load with a safety margin Cooling Load EstimateNewA room's sensible and latent heat gain from walls, roof and glass (U × A × ΔT), people, lights, equipment and outside air — in W, BTU/h and tons COP & EER CalculatorNewRefrigerator and heat pump COP, the Carnot COP from evaporator and condenser temperatures, and COP from EER Superheat & SubcoolingNewSuperheat and subcooling from measured suction- and liquid-line temperatures and saturation temperatures read from a gauge or PT chart, with a general reading Data Transfer TimeNewHow long a download or upload takes from file size (MB, GB or MiB, GiB) and link speed (Mbps, MB/s) — or how much data moves in a given time Decibel (dB) ConverterNewPower ratio (10 log) and voltage ratio (20 log) to dB and back, and watts to dBm and dBW Wavelength & FrequencyNewλ = v ÷ f — wavelength (m, cm, mm, λ/2, λ/4) from frequency or frequency from wavelength, with a cable velocity factor Free-Space Path Loss & Link BudgetNewFree-space path loss (dB) from distance and frequency, and received power (dBm) from transmit power and antenna gains Dilution & MolarityNewAny one of C1V1 = C2V2, molarity from mass and molar mass, and percent w/v — the arithmetic for making up solutions Pearson Square (Blending)NewHow much of two ingredients to blend for a target fat, sugar or other content — cream and milk to 10 % fat, say Brine & Syrup StrengthNewSalt or sugar and water for a brine or syrup of a given strength, and the strength, salometer and Brix of a mix Moisture Content & DryingNewWet- and dry-basis moisture conversion, and how much water to remove to dry to a target moisture and what mass remains Thermal Process (D, z & F Values)NewLog reductions and process time from the D-value (a 12D cook, say), and D at another temperature from the z-value — sterilisation and pasteurisation Product Yield & LossNewYield and loss from raw material and product, the raw material a target output needs, and raw-material cost per kg of product Yarn Count ConverterNewConvert between Ne, Nm, Tex and Denier, and find a yarn's count from a measured length and weight Fabric GSM CalculatorNewGSM and oz/yd² from a cut sample's weight, and an estimate for woven fabric from EPI, PPI, counts and crimp Loom Production CalculatorNewMetres or yards of fabric per hour and per shift from loom speed, PPI and efficiency Yarn Twist (TPI & TPM)NewTwists per inch and per metre from the twist multiplier and count, or from spindle speed and delivery Dyeing Recipe CalculatorNewDye, liquor volume, and salt, soda and auxiliaries by g/L, from the material weight, shade % and liquor ratio