Speed Calculator
Speed —
Also in mph —
For general unit conversion between speed units (m/s, knots, ft/s, etc.) without solving an equation, use the Unit Conversion Calculator's Speed category instead.
Free speed calculator that solves for speed, distance, or time from the other two — using speed = distance ÷ time from any direction.
How it works
- Choose what you want to solve for: speed, distance, or time
- Enter the other two values
- See the result instantly, with speed also converted to mph
Frequently asked questions
How is this different from a pace calculator?
This is a general physics equation solver (speed = distance ÷ time) for any scenario — driving, cycling, or physics homework. The Pace Calculator is specifically built for runners, working in minutes-per-mile pace rather than speed.
I just need to convert between speed units
Use the Unit Conversion Calculator's Speed category instead — it converts between m/s, km/h, mph, knots, and more without needing a distance or time value.
Related tools
From the blog
Update history
- 2026-09-02 Launched: speed calculator that solves for speed, distance, or time (speed = distance ÷ time). Entirely client-side.