Small steps. Big conversions.
Travel distances, compare speeds and make sense of unfamiliar units, wherever the day takes you.
Speed
1 km/h = 0.621371192237 mph
What are you measuring?
Speed reference
One knot is one nautical mile per hour. These are constant-speed unit conversions; they do not estimate travel time or account for stops.
| Unit | Equivalent |
|---|---|
| Meters per secondm/s | 27.7777777778 |
| Kilometers per hourkm/h | 100 |
| Miles per hourmph | 62.1371192237 |
| Knotskn | 53.9956803456 |
| Feet per secondft/s | 91.1344415281 |
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Choose the right family
Length, weight, temperature and more. Units must measure the same kind of quantity.
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See the whole picture
Read the result, check the working, or compare your value across the reference table.
How precise are the results?
We display up to 12 significant digits. Very small or large values use scientific notation. Floating-point arithmetic and rounded definitions can introduce small differences.
Does this work without JavaScript?
Yes. Enter your value, choose your units and press Convert. With JavaScript, the result and table update as you type.
Can I convert between different families?
Only units of the same quantity can be converted directly. For example, converting liters to kilograms requires the material's density.