Conversions
Length Converter
Convert between metric and imperial length units.
Let’s calculate.
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THE IDEA, SIMPLY
How it works
Convert the original length to metres, then convert metres to your chosen unit.
Result = value × source factor / target factor
A worked example
1 metre = 100 centimetres. 1 inch = exactly 2.54 centimetres.
Formula & detailed explanation
Factors in metres: mm = 0.001, cm = 0.01, m = 1, km = 1000, in = 0.0254, ft = 0.3048, yd = 0.9144, mi = 1609.344. International inch, foot, yard and mile definitions are used. Length must be nonnegative.
Calculations use decimal arithmetic with 40 significant digits internally. Choose 0–8 decimal places for the displayed result. Trailing zeros are omitted. Rounding affects only the displayed and copied result; very small values may round to zero. Accepted inputs have up to 100 characters and magnitudes from 10⁻¹⁰⁰ to 10¹⁰⁰, plus zero.