Speed Converter

How to use the Speed Converter

Convert common road, marine, and scientific speed units using standard conversion factors.

Convert speeds among meters per second, kilometers per hour, miles per hour, knots, and other common rates. Each value represents distance traveled per unit time.

The conversion runs locally using the stated factors or formulas. Keep enough precision for the task and verify regulated or engineering work against its controlling standard.

1. Enter the speed value.
2. Choose the source unit and destination unit.
3. Fieldlet converts through meters per second and displays the equivalent speed.

Last reviewed for accuracy: 2026-09-01

Worked examples

How the result is produced

The tool converts the distance numerator and time denominator to a common meters-per-second base, then applies the requested output factor.

• 1 m/s = exactly 3.6 km/h
• 1 international mph = exactly 1.609344 km/h
• 1 knot = 1 nautical mile per hour

Speed units combine distance and time

A speed unit is a distance divided by a duration. Converting kilometers per hour to meters per second therefore changes both components instead of treating the number as a length alone.

• 1 m/s equals exactly 3.6 km/h.
• 1 mph equals exactly 0.44704 m/s.
• A knot uses a nautical mile per hour, not a statute mile.

Limitations and common mistakes

• Displayed speed does not account for wind, current, slope, or measurement uncertainty.
• Navigation and safety decisions should use calibrated instruments and applicable local standards.

Common questions