Speed Distance Time Calculator

Any one of the three from the other two, in four units.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Solve for

Distance

Time

Speed (m/s)

36 km/h · 22.37 mph

Speed10 m/s

In km/h36

In mph22.37

Distance100 m

Time10 s

Time in minutes0.167

Speed is distance over time, and the three quantities determine each other completely — any two give the third. The conversions matter more than they look: 10 m/s is 36 km/h, and the factor is exactly 3.6 because there are 3,600 seconds in an hour and 1,000 metres in a kilometre.

How the Speed Distance Time Calculator works

Speed is distance over time, and the three quantities determine each other completely — any two give the third. Results come in m/s, km/h and mph, because the conversion is where most of the mistakes actually happen.

Also known as: average speed calculator · how to calculate speed · distance and time calculator · speed formula calculator

Where to go next

The Speed Distance Time question rarely arrives on its own. These are the ones that usually come with it:

Velocity Calculator — Final velocity under constant acceleration, with the distance.
Acceleration Calculator — Acceleration in m/s² and in g, which is the legible one.
Momentum Calculator — Momentum, impulse, and the principle behind crumple zones.
Free Fall Calculator — Fall speed and time, with the air resistance caveat stated.

Sources

Frequently asked questions

How do I calculate speed?

Divide distance by time. 100 metres in 10 seconds is 10 m/s.

How do I convert m/s to km/h?

Multiply by 3.6. The factor is exact: 3,600 seconds in an hour divided by 1,000 metres in a kilometre.

How do I convert m/s to mph?

Multiply by 2.23694. So 10 m/s is 22.37 mph.

Is this average speed or instantaneous speed?

Average. It assumes a constant rate over the whole distance, which is what distance divided by time gives you regardless of how the speed varied along the way.

Put this calculator on your own site

Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.

The one-line version

<iframe src="https://www.thecalclibrary.com/embed/speed-distance-time-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Speed Distance Time Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;margin:6px 0 0;color:#64748b">Powered by <a href="https://www.thecalclibrary.com/speed-distance-time-calculator" style="color:#64748b">Speed Distance Time Calculator</a> from The Calc Library</p>

The only condition is that the credit line below the frame stays in place. That one line is what pays for the tool being free — it is how anyone else finds it.