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Measurement › Length
Length
How far is it? Everything from the thickness of a hair to the distance to the moon.
Unit converter
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The metric ladder
- 1 cm = 10 mm. About the width of a fingernail.
- 1 m = 100 cm. A tall step.
- 1 km = 1000 m. About 12 minutes' walk.
Each step up the ladder multiplies by 10, 100, or 1000. That's why metric is fast — moving the decimal point does the converting.
Imperial / US
- 12 inches = 1 foot
- 3 feet = 1 yard
- 1760 yards = 1 mile
Useful conversions to memorise
1 inch ≈ 2.54 cm · 1 foot ≈ 30 cm · 1 mile ≈ 1.6 km · 1 m ≈ 3.28 ft