Length Converter
Length conversion workspace
Enter a decimal, fraction or quick calculation — for example 12.5, 3/8 or (12*4)+6.5.
Batch conversionconvert up to 100 values at once
No values yet.
Compare all length units
One input, every supported equivalent. Select any row as the main target.
| Unit | Equivalent | Target action |
|---|---|---|
| Meters m | 1 | SourceSource |
| Feet ft | 3.28 | TargetSelected |
| Centimeters cm | 100 | |
| Millimeters mm | 1,000 | |
| Inches in | 39.37 | |
| Yards yd | 1.09 | |
| Kilometers km | 1E-3 | |
| Miles mi | 6.21E-4 | |
| Nautical Miles nmi | 5.4E-4 |
Length measures distance or dimension.
Sourced factorsFormula
value in target = value × source factor / target factor
Calculations use the central unit catalog and preserve precision until the result is formatted.
Common conversions
| Input | From | To | Result |
|---|---|---|---|
| 1 | Kilometers | Miles | 0.621371192237 |
Common length conversions
Curated references with worked examples, formulas and the full interactive converter.
Frequently asked questions
How long are an inch and a foot exactly?
The international inch is exactly 25.4 millimeters. One foot is exactly 12 inches, so it equals exactly 0.3048 meters.
Are the results rounded?
The calculation retains full JavaScript number precision; the precision control only formats the displayed result.
Accuracy & transparency
Sources & methodology
Calculations keep full numeric precision until display formatting. These references describe the definitions, variants or factors used; links do not imply affiliation.
SI definitions and published coefficients for selected non-SI units.
Reference factors and named variants for commonly used units, including US liquid cooking measures and British stone.
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