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Convert units with formula, context and precision
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Unit family
Speed
Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.
| Unit | Symbol | Formula |
|---|---|---|
| Metres per second | m/s | base |
| Kilometres per hour | km/h | 1 km/h = 0.277777... m/s |
| Miles per hour | mph | 1 mph = 0.44704 m/s |
| Knot | kn | 1 kn = 0.514444... m/s |
| Feet per second | ft/s | 1 ft/s = 0.3048 m/s |
Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.
Sources
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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. Speed. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.
Common questions
Which base unit does Speed use?
UnitCloud normalises this family through m/s. That keeps tables, direct conversions and batch output consistent.
What is the most common mistake for Speed?
Knots are nautical miles per hour. mph and knots are not interchangeable imperial speeds.
How does UnitCloud round?
UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.
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