Unit Converter

Convert length, weight, volume, and temperature instantly.

From

Enter a value above

How to use the unit converter

Pick a category (length, weight, volume or temperature), enter a value, and choose the units to convert from and to. The result appears as you type, and the swap button reverses the two units.

What it covers

Length: millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.
Weight: milligrams, grams, kilograms, ounces, pounds, stone and metric tons.
Volume: milliliters, liters, teaspoons, tablespoons, cups, fluid ounces, pints, quarts and gallons.
Temperature: Celsius, Fahrenheit and Kelvin.

Length, weight and volume convert by taking your value to a base unit (meters, kilograms or liters) and then to the unit you want. Temperature uses formulas because the scales have different zero points: °F = °C × 9/5 + 32, and K = °C + 273.15.

Common conversions

Conversion	Value
1 inch	2.54 cm (exact)
1 foot	0.3048 m (exact)
1 mile	1.609344 km (exact)
1 pound	about 0.4536 kg
1 US gallon	about 3.785 liters
1 stone	14 pounds, about 6.35 kg

Worked examples

Height: 5 ft 10 in is 70 inches, and 70 × 2.54 = 177.8 cm.

Weight: 150 lb × 0.453592 ≈ 68.04 kg.

Temperature: 350°F is (350 − 32) × 5/9 ≈ 176.67°C. Body temperature of 98.6°F is 37°C, and 20°C is 68°F.

Watch out for these

Ton: here it means a metric ton (1,000 kg), not the US short ton of 2,000 lb, which is about 907 kg.
Gallons, pints and quarts are US liquid measures. A UK (imperial) gallon is about 4.546 liters, roughly 20% larger.
Ounces: the weight ounce is not the same as the fluid ounce, and one doesn't convert to the other without knowing the ingredient. For cooking, use the cooking converter, which handles it by ingredient.

Why not just search "X to Y" on Google?

Google's built-in converter is quick for a single one-off value, but it resets every time and only handles one conversion at a time. This tool keeps your value in view while you try several target units, remembers your last category as you scroll, and covers a wider set of units in one place, including stone, nautical miles, and metric tons, which Google's quick answer often doesn't offer directly.

More reference points

Conversion	Value
1 stone	14 pounds
1 nautical mile	1.852 km
1 metric ton	1,000 kg (about 2,204.6 lb)
1 cup (US)	236.588 ml
1 UK gallon	4.546 liters
−40°	the one point where Fahrenheit and Celsius are equal

Frequently asked questions

How precise are the results?

Results show up to six decimal places using standard conversion factors, which is far more precision than most everyday tasks need.

How do I convert a percentage or a price?

Use the percentage calculator for percent changes and the discount calculator for prices. For body measurements, see the BMI calculator, which accepts imperial and metric units.