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Unit Converter

Convert between the most common units of length, weight and volume in one place. Pick a category, type a value, choose the units and get an instant answer, with the option to copy the results.

How it works Report a problem

Universal Converter

Legendary multi-dimension translation across all scales.

CONVERTED VALUE
0.00
Unit Name

Alternative Scales

About the Unit Converter

Convert between the most common units of length, weight and volume in one place. Pick a category, type a value, choose the units and get an instant answer, with the option to copy the results.

How to use the Unit Converter

  1. Choose a category at the top: Length, Weight or Volume.
  2. Enter the Value and select the Unit you are converting from.
  3. Press Convert to see the value in the other units, then use Copy Results if you need to paste them elsewhere.

Formula and method

Every conversion multiplies by a fixed factor. The converter first converts your value to a base unit (metres, kilograms or litres) and then to the unit you want.

Handy conversion factors
From To Multiply by
inches centimetres 2.54
miles kilometres 1.609344
pounds kilograms 0.453592
US gallons litres 3.78541

Worked example

5 miles Ă— 1.609344 = 8.05 km. 150 lb Ă— 0.453592 = 68.04 kg.

When to use the Unit Converter

  • Converting recipe amounts between metric and imperial units.
  • Checking measurements on product specs, shipping labels and manuals.
  • Solving physics and chemistry problems that mix different unit systems.

Common mistakes to avoid

  • Confusing US and UK units. A US gallon is about 3.785 litres, and a UK gallon is about 4.546 litres.
  • Converting a squared or cubed unit with the plain length factor. 1 m² is 10,000 cm², not 100.
  • Rounding too early in a multi-step calculation.

Tips

  • US and imperial gallons, pints and fluid ounces are different sizes. Check which one you need.
  • Round only at the end of a calculation to avoid accumulating errors.

Frequently asked questions

Which units are metric?
Metres, grams and litres and their multiples (kilo-, centi-, milli-) are metric. Miles, pounds and gallons are US customary or imperial units.
How many centimetres are in an inch?
Exactly 2.54.
Is a ton the same everywhere?
No. A US short ton is 2,000 lb, a UK long ton is 2,240 lb and a metric tonne is 1,000 kg.