We use 343 m/s (sea level, dry air, 20 °C). Real mach varies with altitude and temperature — treat the value as a reference.

How precise is the knot conversion?

1 knot = exactly 0.514444 m/s (1 nautical mile / hour). The converter applies that factor in full precision.

Why include the speed of light?

For physics demos and fun comparisons. c = 299,792,458 m/s exactly per SI definition.

Yes — once the page loads, every conversion runs in your browser without a network call.

Speed converter

Base unit: m/s · 7 units

From

km/h — Kilometer per hour

62.137119

mph — Mile per hour

All units