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How to Convert Units of Measurement

To convert units, enter a value into the matching converter and pick the units — it applies the exact conversion factor instantly. Common ones: 1 inch = 2.54cm, 1kg = 2.205lb, °F = °C × 9/5 + 32.

Last updated: 2026-07-17

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Handy conversions to remember

  • 1 inch = 2.54 cm; 1 foot = 30.48 cm.
  • 1 kilometre ≈ 0.621 miles.
  • 1 kg ≈ 2.205 lb.
  • °F = (°C × 9/5) + 32; °C = (°F − 32) × 5/9.

Why use a tool

Conversion factors are easy to misremember and rounding by hand introduces errors. A converter applies the exact factor every time, which matters for recipes, travel, shipping and engineering.

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Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply the Celsius value by 9/5 and add 32. For example, 20°C × 9/5 + 32 = 68°F.

How many centimetres are in an inch?

Exactly 2.54 centimetres. So 10 inches is 25.4 cm.

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