Speed Calculator

Calculate speed, distance, or time. Convert between mph, km/h, m/s, knots, and more.

Calculate

Speed

Speed Unit

Distance

Distance Unit

Time

Time Unit

Speed

—

All Unit Conversions

How It Works

Speed = Distance / Time. Enter any two values to calculate the third. All inputs are converted to standard units (m/s for speed, meters for distance, seconds for time) before calculation.

About this Calculator

The Speed Calculator is a free, easy-to-use tool for mph, km/h, distance. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.