Speed Calculator

Use it when your task matches one of these common needs: Find average speed for a drive, run, ride, or race. Convert the same speed into mph, km/h, and m/s. It works best when you already know the measurements, amounts, units, or options the page asks for.

In plain language: The calculator converts hours, minutes, and seconds into decimal hours, then divides distance by time. The examples on the page are there so you can compare your inputs with a worked example before copying the answer.

Distance miles: the total distance covered across the whole trip or activity. Hours, minutes, seconds: the full elapsed time for that same distance, including stops if you want whole-trip average speed. Average speed: distance divided by total time, not the fastest speed reached.

Read the headline answer, then check the supporting lines and examples to understand how the calculator got there. If one input changes, rerun the tool and compare the new answer instead of guessing.

This gives average speed over the whole distance. It does not show instant speed, stops, traffic, pace changes, or route conditions. Also check the unit, scale, mode, and result limit because small input changes can change the answer.

Average speed spreads the whole distance over the whole time. Stops, slower sections, and waiting time all lower the average even if you were moving faster for part of the trip.

No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.