UnitCloud is a calculation aid. Standards, contracts, medical decisions, engineering approvals and official requirements need original sources.
Unit console
Convertir des unités avec formule, contexte et précision
UnitCloud est un laboratoire de mesure local pour le quotidien, la technique, l'informatique, l'énergie, la mobilité et le design.
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Unit family
Longueur
Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.
| Unit | Symbol | Formule |
|---|---|---|
| Nanometre | nm | 1 nm = 0.000000001 m |
| Micrometre | µm | 1 µm = 0.000001 m |
| Millimetre | mm | 1 mm = 0.001 m |
| Centimetre | cm | 1 cm = 0.01 m |
| Metre | m | base |
| Kilometre | km | 1 km = 1000 m |
| Inch | in | 1 in = 0.0254 m |
| Foot | ft | 1 ft = 0.3048 m |
| Yard | yd | 1 yd = 0.9144 m |
| Mile | mi | 1 mi = 1609.344 m |
| Nautical mile | nmi | 1 nmi = 1852 m |
Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.
Sources
Search and practice paths
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Factors come from the stored source family and are not derived from rounded display values.
UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.
Do not use as the sole basis for official, medical, safety-critical or contractual decisions.
Citation note: UnitCloud, conversion with formula, sources current as of May 2026. Longueur. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.
Common questions
Which base unit does Longueur use?
UnitCloud normalises this family through m. That keeps tables, direct conversions and batch output consistent.
What is the most common mistake for Longueur?
Inch, foot and mile use fixed factors. Errors usually come from early rounding or from mixing land miles and nautical miles.
How does UnitCloud round?
UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.
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