Utility
Unit converters, calculators and everyday helpers.
61 tools
Length Converter
Convert length and distance instantly: meters, feet, inches, miles, centimeters and more — right in your browser.
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Weight Converter
Convert kilograms, pounds, ounces, stones and grams instantly — free, private and works offline.
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Temperature Converter
Celsius to Fahrenheit and Kelvin, instantly. Live results plus freezing and boiling reference points.
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Data Size Converter
Convert bytes, KB, MB, GB and TB — both decimal (1000) and binary (1024) conventions, side by side.
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Speed Converter
km/h, mph, knots, m/s and more — convert running pace, wind speed and vehicle speed instantly.
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Volume Converter
Liters, gallons, cups, milliliters and cubic meters — US and UK units clearly labeled.
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Area Converter
Square meters, square feet, acres, hectares and more — for real estate, land and flooring.
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Time Unit Converter
Seconds, minutes, hours, days, weeks, months and years — with the month/year caveat explained.
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Pressure Converter
bar, psi, pascal, atmosphere, mmHg and more — for tires, diving, weather and HVAC.
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Energy Converter
Calories, kilojoules, joules, kWh, Wh and BTU — food labels, electricity bills and physics in one place.
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Currency Converter
Convert 160+ world currencies with fresh mid-market rates — loaded once online, calculated and cached privately in your browser.
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Time Zone Converter
Compare times across 21 major cities with live clocks and an hour-by-hour table — DST handled exactly, everything runs in your browser.
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Binary Converter
Convert between decimal, hexadecimal, octal and binary in one live grid — supports arbitrarily large integers, grouping for readability.
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Roman Numeral Converter
Convert numbers to Roman numerals and back, in both directions at once — with strict classical validation of subtractive notation.
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Age Calculator
Work out an exact age in years, months and days, total days lived, and a live countdown to the next birthday — calendar accurate.
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BMI Calculator
Calculate Body Mass Index from metric or imperial inputs and see exactly where the value lands in the official WHO weight categories.
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Percentage Calculator
Three percentage problems in one live tool: X% of Y, X is what percent of Y, and the percent change between two values.
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EMI Calculator
Compute the fixed monthly EMI for any loan — principal, rate and tenure in, total interest and total repayment out, instantly.
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Loan Calculator
See the full picture of a loan: monthly payment, total interest and a year-by-year amortization table showing principal and interest splits.
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GST Calculator
Add or extract GST at the 5%, 12%, 18% and 28% slab rates — net, tax and gross amounts computed live in your browser.
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VAT Calculator
Add VAT to a net price or extract it from a gross price at any custom rate — net, VAT and gross amounts live, private and instant.
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Discount Calculator
Price plus one or two stacked discounts in: final price, money saved and the true combined percentage — worked out as you type.
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Profit Calculator
Cost and selling price in: profit or loss, profit margin and markup percentage out — the pricing numbers sellers mix up, sorted live.
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Scientific Calculator
A full scientific calculator in your browser: trig, log, ln, powers and roots with a live result — no eval, no server, no tracking.
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Date Calculator
Days between two dates in years, months and days — or add and subtract days from any date — with leap years handled exactly.
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QR Code Generator
Turn any text or URL into a crisp QR code with adjustable size, colors and error-correction level — download as PNG or SVG.
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Barcode Generator
Create scannable CODE128, EAN-13 and UPC-A barcodes with adjustable bar width and height — vector SVG output, rendered in your browser.
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Color Picker
Pick a color from the swatch or grab one straight from your screen with the EyeDropper API — hex, RGB and HSL copied in one click.
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Color Converter
Paste a color in hex, rgb() or hsl() and get all three formats plus a ready-made row of tints and shades for your design system.
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Unix Timestamp Converter
Convert Unix seconds or milliseconds to human dates and back, with a live clock, local-timezone and UTC output — all in your browser.
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Tip Calculator
Bill plus tip percentage plus split between friends: see the tip, the total and exactly what each person owes — live, no math at the table.
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Fuel Cost Calculator
Distance, efficiency and pump price in: fuel needed, trip cost and cost per kilometer or mile out — metric or imperial, with round trip.
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Aspect Ratio Calculator
Given a ratio like 16:9 and one dimension, get the missing width or height instantly — plus presets from 1:1 to 21:9 for video and design.
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Compound Interest Calculator
See how savings grow with compound interest — enter a deposit, monthly contributions and a rate to get the final balance and a year-by-year table.
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Random Name Picker
Paste your list, spin the wheel and let a cryptographically random draw pick the winner — fair for classrooms, raffles and team stand-ups.
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QR Code Scanner
Decode a QR code from any image or straight from your camera — read locally in your browser, with copy and open-as-link output and nothing uploaded.
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Mortgage Calculator
Work out the monthly payment on a home loan — P&I plus tax, insurance and HOA — with loan amount, total interest and a yearly amortization table.
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Salary to Hourly Calculator
Convert an annual salary into hourly, daily, weekly, biweekly and monthly pay — and see the adjusted hourly rate once unpaid days off are factored in.
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Hourly to Salary Calculator
Turn an hourly rate into daily, weekly, biweekly, monthly and annual pay at your real schedule — default 40 hours a week across 52 weeks.
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Break-Even Calculator
Find the units and revenue where a product stops losing money — fixed costs, price and variable cost in, contribution margin and profit table out.
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Pace Calculator
Compute running pace per km and per mile from any distance and time, then predict race times with Peter Riegel's 1.06 exponent formula.
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One Rep Max Calculator
Estimate your one-rep max from any weight-and-reps set with Epley and Brzycki formulas, plus a 1–12 rep training table with percentages of 1RM.
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Sleep Calculator
Find the best bedtime for a set wake-up time — or when to wake if you sleep now — using 90-minute sleep cycles plus 15 minutes to fall asleep.
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Business Days Calculator
Count business days between two dates or add and subtract workdays from any date — with your own weekend definition and a custom holiday list.
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Cooking Conversion Calculator
Convert cups, tablespoons and teaspoons to grams and ounces for 24 common ingredients, with an oven °F↔°C table — all averages, no server round-trips.
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BMR Calculator
Calculate your basal metabolic rate with the Mifflin-St Jeor equation (1990) — the calories your body burns at complete rest every day.
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Calorie Calculator
Turn your BMR into daily calorie targets: five activity levels (×1.2–1.9) plus lose, maintain or gain goals of about ±500 kcal a day.
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Body Fat Calculator
Estimate body fat percentage with the US Navy tape method (Hodgdon & Beckett, 1984) from height, neck and waist — hips for women.
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Ideal Weight Calculator
See your ideal weight from the Devine formula (1975) and the healthy BMI band (18.5–24.9) for your height, shown in kg or pounds.
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Water Intake Calculator
Get a daily water target: 35 ml per kilogram of body weight plus about 350 ml for every 30 minutes of exercise, with hot-weather guidance.
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Overtime Pay Calculator
Work out overtime pay at 1.5× or 2× your hourly rate — regular pay, the overtime premium, your weekly total and an annualized figure from a salary.
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Rent Affordability Calculator
Find the maximum rent your monthly income can carry under the 30%, 33% or 40% rule — then see what remains after debts and renter insurance each month.
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APY Calculator
Convert a nominal APR into the effective APY — and back again — for daily, monthly, quarterly or annual compounding, with optional growth of a deposit over time.
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GPA Calculator
Turn this semester's courses into a GPA on the 4.0 scale with standard quality points, then blend your prior credits into one honest cumulative GPA.
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Heart Rate Zones Calculator
Turn max and resting heart rate into five training zones with the Karvonen method — warm-up, fat burn, aerobic, anaerobic and VO₂ max, in bpm.
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Shoe Size Converter
Convert shoe sizes between US, UK, EU and Japanese systems for men and women — anchored to foot length in centimeters.
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Stopwatch
A precise online stopwatch with lap times — start, pause, lap and reset, with drift-free timing anchored to the system clock.
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Countdown Timer
Set a countdown with a progress ring and a chime at zero — 1 to 25 minute presets or any custom duration.
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Contrast Checker
Check the WCAG contrast ratio between two colors with AA and AAA pass/fail for normal and large text, plus a live preview. Runs entirely in your browser.
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Grade Calculator
Weighted or points-based grade calculator: add assignments, see your current grade and letter, and find out exactly what to score on the final exam.
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CSS Gradient Generator
Blend two to five colors into linear, radial or conic CSS gradients with a live preview, ready-to-paste code and one-click harmonized palettes.
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