Free Online Unit Converters
Convert length, weight, temperature, area, speed, volume and time units online for free. Accurate two-way conversion with instant results.
79 tools in this collection — free, private and instant.
Measurement
Length Converter
Convert between metres, feet, inches, miles, yards & more.
Weight Converter
Convert kg, g, mg, lb, oz and ton instantly.
Area Converter
Square metres, feet, acres, hectares — instant conversion.
Volume Converter
Litres, ml, m³, gallons, cups and pints.
Length Converter
Convert between all common length units instantly.
Weight Converter
Convert between all common weight units instantly.
Area Converter
Convert between all common area units instantly.
Volume Converter
Convert between all common volume units instantly.
Science & motion
Temperature Converter
Celsius, Fahrenheit and Kelvin conversions.
Speed Converter
Convert m/s, km/h, mph, knots and ft/s.
Speed Converter
Convert between all common speed units instantly.
Pressure Converter
Convert between all common pressure units instantly.
Energy Converter
Convert between all common energy units instantly.
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin.
Numbers & time
Time Converter
Seconds, minutes, hours, days, weeks, months, years.
Roman Numeral Converter
Convert numbers ↔ Roman numerals (I, V, X, L, C, D, M).
Number to Words (Indian)
Convert numbers to words in the Indian numbering system.
Binary / Decimal Converter
Convert between decimal, binary, octal and hexadecimal.
Hex to RGB Converter
Convert HEX color codes to RGB and see a live swatch.
Time Converter
Convert between all common time units instantly.
Centimetre to Inch Converter
Convert centimetre to inch — and back — with exact factors.
Inch to Centimetre Converter
Convert inch to centimetre — and back — with exact factors.
More free online unit converters
Data Storage Converter
Convert between all common data storage units instantly.
Power Converter
Convert between all common power units instantly.
Angle Converter
Convert between all common angle units instantly.
Frequency Converter
Convert between all common frequency units instantly.
Fuel Economy Converter
Convert between all common fuel economy units instantly.
Metre to Foot Converter
Convert metre to foot — and back — with exact factors.
Kilometre to Mile Converter
Convert kilometre to mile — and back — with exact factors.
Foot to Metre Converter
Convert foot to metre — and back — with exact factors.
Mile to Kilometre Converter
Convert mile to kilometre — and back — with exact factors.
Yard to Metre Converter
Convert yard to metre — and back — with exact factors.
Millimetre to Inch Converter
Convert millimetre to inch — and back — with exact factors.
Foot to Inch Converter
Convert foot to inch — and back — with exact factors.
Kilogram to Pound Converter
Convert kilogram to pound — and back — with exact factors.
Pound to Kilogram Converter
Convert pound to kilogram — and back — with exact factors.
Gram to Ounce Converter
Convert gram to ounce — and back — with exact factors.
Kilogram to Tola Converter
Convert kilogram to tola — and back — with exact factors.
Tonne to Kilogram Converter
Convert tonne to kilogram — and back — with exact factors.
Stone to Kilogram Converter
Convert stone to kilogram — and back — with exact factors.
Square foot to Square metre Converter
Convert square foot to square metre — and back — with exact factors.
Square metre to Square foot Converter
Convert square metre to square foot — and back — with exact factors.
Acre to Hectare Converter
Convert acre to hectare — and back — with exact factors.
Bigha to Square foot Converter
Convert bigha to square foot — and back — with exact factors.
Acre to Square foot Converter
Convert acre to square foot — and back — with exact factors.
Cent to Square foot Converter
Convert cent to square foot — and back — with exact factors.
About these tools
Unit conversion should take one second, not five tabs. Each converter here works both ways: type into either field and the other updates immediately.
Alongside the metric and imperial basics you will find the units Indian users need day to day — square feet to gaj and bigha for property, kilometres per litre for mileage, and Celsius to Fahrenheit for weather and cooking.
Popular searches
Frequently asked questions
How accurate are the conversions?
Conversions use standard SI factors and full floating-point precision, then round only for display.
Can I convert in both directions?
Yes. Every converter is bidirectional — edit either side and the other recalculates.
Do the converters work offline?
Once the page has loaded, the conversion itself needs no network connection.
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