Speed Distance Time Calculator

What is speed distance time calculator?

Speed, distance and time are linked by one simple rule. If you know any two, you can find the third. People use it for travel planning, fitness, school physics and shipping.

This calculator solves any of the three, accepts kilometers, miles or meters, and shows the answer in km/h, mph and m/s so you can compare.

How to use the speed distance time calculator

1. Choose what to find.
2. Fill in the other two values. Leave the unused field as it is.
3. Read the results.

How the speed distance time calculator works

Speed equals distance divided by time. Distance equals speed times time. Time equals distance divided by speed. All values are converted to meters and seconds first, then back to your units.

Worked example

Common uses of the speed distance time calculator

• Planning a road trip.
• Estimating delivery times.
• Running and cycling goals.
• Physics homework.
• Flight and ship planning.

Tips and common mistakes

Average speed on a trip is total distance divided by total time, including stops.

Match units: do not mix miles with km/h without converting.

Background: what to know before you rely on it

The relationship between speed, distance and time is the first formula most students meet in physics. It assumes constant speed, which real trips rarely have, so the answer is an average. Traffic, stops and speed limits change the real time. For planning, add a buffer. In aviation and shipping, speeds are in knots and distances in nautical miles, which relate to degrees of latitude. Keeping units consistent is the key to avoiding mistakes.

Private, free and fast

This tool runs entirely in your browser. What you type or choose is not uploaded to a server and is not saved after you close the page, which keeps it fast and private. It is free to use as often as you like. See more in all calculators, or browse the full list of tools.

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Results are for information and education. For legal, financial, medical or security decisions, check with a qualified professional. Financial results are estimates and exclude fees and taxes unless the tool says otherwise.