11 free tools
Unit Converters
Length, weight, temperature & more. Each listed tool has free public access, with processing and account requirements labeled where applicable.
- Free public access
- Account rules labeled
- Processing clearly labeled
- Instant results
Most used unit converters tools
Universal Unit Converter
One converter with seven category tabs — length, weight, area, volume, storage, speed, and temperature — showing every unit at once as you type.
Length Converter
Convert between mm, cm, m, km, inches, feet, yards, and miles with exact factors, precision control, a live all-units grid, and a reference table.
Weight Converter
Convert kilograms, grams, milligrams, tonnes, pounds, ounces, and stones with exact factors, a live all-units grid, and precision control.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin with the real offset formulas, precision control, and a reference table from absolute zero to oven heat.
All unit converters tools
Universal Unit Converter
One converter with seven category tabs — length, weight, area, volume, storage, speed, and temperature — showing every unit at once as you type.
Length Converter
Convert between mm, cm, m, km, inches, feet, yards, and miles with exact factors, precision control, a live all-units grid, and a reference table.
Weight Converter
Convert kilograms, grams, milligrams, tonnes, pounds, ounces, and stones with exact factors, a live all-units grid, and precision control.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin with the real offset formulas, precision control, and a reference table from absolute zero to oven heat.
Data Storage Converter
Convert bits, bytes, KB, MB, GB, TB, and PB in both the decimal (1000) and binary (1024) conventions — the split behind the missing gigabytes.
Speed Converter
Convert km/h, mph, m/s, ft/s, knots, and Mach with exact factors, a live all-units grid, precision control, and copyable results.
Area Converter
Convert square metres, square feet, square yards, hectares, acres, square kilometres, and square miles with exact factors and a live grid.
Volume & Cooking Converter
Convert millilitres, litres, cups, tablespoons, teaspoons, pints, quarts, and gallons — with explicit US, UK, and metric cup systems.
Fuel Economy Converter
Convert US MPG, UK MPG, km/L, and L/100km — handling the reciprocal math where lower is better — with all four measures shown at once.
Shoe & Clothing Size Converter
Compare US, UK, EU, and Indian shoe sizes plus clothing sizes across five charts, anchored to real foot-length and chest measurements.
Roman Numeral & Number-to-Words Converter
Convert numbers to Roman numerals and back (1–3999, strictly validated), and write numbers as words — international or Indian style, with ordinals and cheque amounts.
Why use these unit converters tools
One converter for everything
The Universal Unit Converter handles many measurement types in one place, while focused tools like the Length Converter and Temperature Converter do a single job well.
Accurate across systems
Convert cleanly between metric and imperial — the Weight Converter and Length Converter use exact conversion factors, not rounded guesses.
Handy for real tasks
From a recipe to a workshop to homework, get the number you need instantly with no formula to remember.
What you can do with Unit Converters
Convert a recipe between grams and cups with the Volume & Cooking Converter.
Switch a measurement between metric and imperial using the Length Converter or Weight Converter.
Convert a temperature between Celsius and Fahrenheit with the Temperature Converter.
Look up a clothing or shoe size across regions with the Shoe & Clothing Size Converter.
How to choose the right tool
Not sure which unit?
Start with the Universal Unit Converter, which covers many categories on one screen.
Converting one thing often?
Bookmark a focused tool like the Length Converter, Weight Converter or Temperature Converter for one-tap access.
Everyday, non-metric needs?
The Volume & Cooking Converter helps in the kitchen and the Shoe & Clothing Size Converter handles international sizes.
About Unit Converters
Convert measurements instantly with our comprehensive unit conversion tools. Whether you're dealing with length, weight, temperature, volume, or area, these calculators provide precise translations between metric, imperial, and other standard systems. Perfect for students, engineers, chefs, and DIY enthusiasts, these fast, web-based converters eliminate the need for complicated formulas. Experience seamless, ad-free conversions that run completely offline in your browser, helping you get accurate numbers right when you need them.
Unit converters run in your browser and keep working offline once loaded. The values you enter are processed on your device and are never uploaded.