What units does distance and time use?

Distance is in kilometers and time is in hours. If your time is in minutes, divide by 60 (e.g. 30 minutes = 0.5 hours).

How is speed converted between units?

Internally the calculator works in m/s. It converts km/h by dividing by 3.6 and mph by dividing by 2.23694 (1 mph ≈ 0.44704 m/s).

Yes — pick the corresponding button at the top. The other two fields become inputs and the third is solved.

Check that you entered time in hours (not minutes) and distance in km. A 2-hour trip covering 120 km is 60 km/h, not 7200 km/h.

No — the calculation runs entirely in your browser.

Solve speed, distance or time from the other two — km/h, m/s, mph.

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