Free Online Unit Converter
Convert length, weight, temperature, volume, speed, area and data units instantly: cm to inches, kg to lbs, Celsius to Fahrenheit and more.
39 tools
Unit ConverterConvert length, weight, volume, temperature, area and speed between metric and imperial units instantly, with Acres to Hectares ConverterConvert Acres to Hectares instantly with the exact formula (1 ac = 0.404686 ha), a quick table and the reverseCelsius to Fahrenheit ConverterConvert Celsius to Fahrenheit instantly with the exact formula (°F = °C × 9/5 + 32), a quick table and the revCentimeters to Feet ConverterConvert Centimeters to Feet instantly with the exact formula (1 cm = 0.032808 ft), a quick table and the reverCentimeters to Inches ConverterConvert Centimeters to Inches instantly with the exact formula (1 cm = 0.393701 in), a quick table and the revCups to Ml ConverterConvert Cups to Ml instantly with the exact formula (1 cup = 236.58824 ml), a quick table and the reverse convFahrenheit to Celsius ConverterConvert Fahrenheit to Celsius instantly with the exact formula (°C = (°F − 32) × 5/9), a quick table and the rFeet to Centimeters ConverterConvert Feet to Centimeters instantly with the exact formula (1 ft = 30.48 cm), a quick table and the reverse Feet to Inches ConverterConvert Feet to Inches instantly with the exact formula (1 ft = 12 in), a quick table and the reverse conversiFeet to Meters ConverterConvert Feet to Meters instantly with the exact formula (1 ft = 0.3048 m), a quick table and the reverse conveFl Oz to Ml ConverterConvert Fl Oz to Ml instantly with the exact formula (1 fl oz = 29.57353 ml), a quick table and the reverse coGallons to Liters ConverterConvert Gallons to Liters instantly with the exact formula (1 gal = 3.785412 L), a quick table and the reverseGB to MB ConverterConvert GB to MB instantly with the exact formula (1 GB = 1024 MB), a quick table and the reverse conversion.Grams to Ounces ConverterConvert Grams to Ounces instantly with the exact formula (1 g = 0.035274 oz), a quick table and the reverse coHectares to Acres ConverterConvert Hectares to Acres instantly with the exact formula (1 ha = 2.471054 ac), a quick table and the reverseHP to kW ConverterConvert HP to kW instantly with the exact formula (1 hp = 0.7457 kW), a quick table and the reverse conversionInches to Centimeters ConverterConvert Inches to Centimeters instantly with the exact formula (1 in = 2.54 cm), a quick table and the reverseInches to Feet ConverterConvert Inches to Feet instantly with the exact formula (1 in = 0.083333 ft), a quick table and the reverse coInches to Millimeters ConverterConvert Inches to Millimeters instantly with the exact formula (1 in = 25.4 mm), a quick table and the reverseKB to MB ConverterConvert KB to MB instantly with the exact formula (1 KB = 0.000977 MB), a quick table and the reverse conversiKg to Lbs ConverterConvert Kg to Lbs instantly with the exact formula (1 kg = 2.204623 lb), a quick table and the reverse conversKilometers to Miles ConverterConvert Kilometers to Miles instantly with the exact formula (1 km = 0.621371 mi), a quick table and the reverkm/h to mph ConverterConvert km/h to mph instantly with the exact formula (1 km/h = 0.621371 mph), a quick table and the reverse coKW to HP ConverterConvert KW to HP instantly with the exact formula (1 kW = 1.341022 hp), a quick table and the reverse conversiLbs to Kg ConverterConvert Lbs to Kg instantly with the exact formula (1 lb = 0.453592 kg), a quick table and the reverse conversLiters to Gallons ConverterConvert Liters to Gallons instantly with the exact formula (1 L = 0.264172 gal), a quick table and the reverseMB to GB ConverterConvert MB to GB instantly with the exact formula (1 MB = 0.000977 GB), a quick table and the reverse conversiMeters to Feet ConverterConvert Meters to Feet instantly with the exact formula (1 m = 3.28084 ft), a quick table and the reverse convMeters to Yards ConverterConvert Meters to Yards instantly with the exact formula (1 m = 1.093613 yd), a quick table and the reverse coMiles to Kilometers ConverterConvert Miles to Kilometers instantly with the exact formula (1 mi = 1.609344 km), a quick table and the reverMillimeters to Inches ConverterConvert Millimeters to Inches instantly with the exact formula (1 mm = 0.03937 in), a quick table and the reveMl to Fl Oz ConverterConvert Ml to Fl Oz instantly with the exact formula (1 ml = 0.033814 fl oz), a quick table and the reverse coMph to Km/H ConverterConvert Mph to Km/H instantly with the exact formula (1 mph = 1.609344 km/h), a quick table and the reverse coOunces to Grams ConverterConvert Ounces to Grams instantly with the exact formula (1 oz = 28.349523 g), a quick table and the reverse cSquare Feet to Square Meters ConverterConvert Square Feet to Square Meters instantly with the exact formula (1 ft² = 0.092903 m²), a quick table andSquare Meters to Square Feet ConverterConvert Square Meters to Square Feet instantly with the exact formula (1 m² = 10.76391 ft²), a quick table andStone to Kg ConverterConvert Stone to Kg instantly with the exact formula (1 st = 6.350293 kg), a quick table and the reverse conveTablespoons to ml ConverterConvert Tablespoons to ml instantly with the exact formula (1 tbsp = 14.786765 ml), a quick table and the reveYards to Meters ConverterConvert Yards to Meters instantly with the exact formula (1 yd = 0.9144 m), a quick table and the reverse conv
About Unit Converters
Convert any unit in seconds
A recipe in cups, a height in feet, a weight in pounds, a speed limit in miles per hour: units get in the way every day. These free converters give you the answer instantly, in your browser, with no app and no sign-up. Use the all-in-one unit converter for anything, or open a dedicated converter for the pair you need most.
Length, weight and temperature
- Length and height: cm to inches, inches to cm, feet to meters, mm to inches and km to miles.
- Weight: kg to lbs, lbs to kg, ounces to grams and stone to kg.
- Temperature: Celsius to Fahrenheit and Fahrenheit to Celsius.
Cooking, speed and data
Convert cups to ml, tablespoons to ml and gallons to liters in the kitchen or at the pump, mph to km/h and km/h to mph on the road, and MB to GB or GB to MB for file sizes and data plans.
Area, land and power
Work out floor space with square feet to square meters and back, land with acres to hectares, and engine power with HP to kW and kW to HP. For sums rather than units, see the calculators.
Tips
- US and UK gallons and cups are different sizes, so check which one your recipe or source uses.
- Round only at the end; rounding in the middle of a calculation adds up errors.
- Handy anchors for a quick sanity check: 1 inch is exactly 2.54 cm and 1 mile is about 1.609 km.