Speed Calculator

Enter distance and elapsed time to get m/s, km/h, mph, knots, and feet per second.

Distance

Time

—m/s

—km/h

—mph

—knots

—Average speed = distance / time

These are idealized classical-physics calculations. Real systems can differ because of air resistance, friction, deformation, measurement uncertainty, non-constant forces, or other effects not included in the selected model.

How to use this Speed Calculator

Calculate speed from distance and time with common metric and US units. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.