Converting speed
Speed is distance travelled per unit of time. One kilometre per hour is 1,000/3,600 metres per second. A knot is one nautical mile per hour.
How the calculation works
Multiply the source value by its base-unit factor, then divide by the destination factor. For example, 1 km/h ≈ 0.6213711922 mph.
Precision and rounding
Choose 6, 10 or 15 significant figures for the displayed result. Calculations use unrounded JavaScript numbers. The ≈ symbol indicates that displayed results may be rounded; significant figures are display precision, not measurement accuracy.