Calculatoo

Unit Converter

Pick what you are measuring, enter a value and choose the two units.

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Conversion factors

Quantity Base unit Factors
Length metre mm 0.001, cm 0.01, km 1000, in 0.0254, ft 0.3048, yd 0.9144, mi 1609.344
Mass kilogram mg 0.000001, g 0.001, lb 0.45359237, oz 0.028349523125

To convert, multiply by the factor of the starting unit and divide by the factor of the target unit.

Temperature

  • Celsius to Fahrenheit: °F = °C × 9 ÷ 5 + 32
  • Celsius to Kelvin: K = °C + 273.15

Worked examples

  • 1 mile to kilometres: 1 × 1609.344 ÷ 1000 = 1.609344 km.
  • 100 °C to Fahrenheit: 100 × 9 ÷ 5 + 32 = 212 °F.

Frequently asked questions

How many kilometres are in a mile?

One mile is exactly 1.609344 kilometres. To convert miles to kilometres, multiply by 1.609344.

How do I convert Celsius to Fahrenheit?

Multiply the Celsius value by 9, divide by 5 and add 32. Water boils at 100 °C, which is 212 °F.

Why do I get an error for a temperature?

No temperature can be below absolute zero: 0 K, −273.15 °C or about −459.67 °F. Values lower than that are not valid.

How we calculate

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