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Speed Calculator

Solve speed, distance or time and convert between speed units.

Calculators Reviews Free · no sign-up

speed = distance ÷ time

Fill in two, leave the third blank.

Distance
Time
Speed

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Kilometres per hour—
Miles per hour—
Metres per second—
Knots—
Feet per second—

Average speed over legs

Not the average of the speeds — total distance over total time.

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Quick Tool Overview

The Speed Calculator solves for speed, distance or time from the other two, and converts every answer into kilometres per hour, miles per hour, metres per second and knots. An average speed panel handles journeys made of several legs — which is not the average of the speeds.

What it does
Solves speed, distance or time and converts the units
You give it
Any two of speed, distance and time
You get back
The third value in four common speed units
Best for
Journey planning, physics homework, sailing and aviation
Calculators Free, unlimited use No sign-up Runs in your browser

About the Speed Calculator

Enter any two of speed, distance and time to get the third. Speed is the distance covered divided by the time taken, and the same relationship rearranges to give distance as speed times time, or time as distance divided by speed.

Every answer is converted into the four units people actually use — kilometres per hour, miles per hour, metres per second and knots — because the unit a figure arrives in is rarely the one you need it in. There is also an average speed panel for a journey made of several legs at different speeds, which is not simply the average of those speeds: it is total distance over total time, and the difference between the two is a classic trap.

Key features of the Speed Calculator

Four units on every answer

km/h, mph, metres per second and knots, because the unit a figure arrives in is rarely the one you need.

Rearranges automatically

Distance over time, speed times time, or distance over speed — the calculator picks the right form.

Average speed across legs

Total distance over total time, not the average of the leg speeds — the difference is a classic trap.

Mixed units accepted

Enter a distance in miles and a time in minutes without converting first.

Instant results

Every conversion updates as you type.

How to use the Speed Calculator

  1. 1

    Enter two values

    Fill in any two of speed, distance and time, and leave the one you want blank.

  2. 2

    Pick your units

    Choose the units for distance and speed independently — mixing kilometres with miles per hour is handled.

  3. 3

    Read every conversion

    The speed is shown in kph, mph, metres per second and knots at the same time.

Frequently asked questions

Speed equals distance divided by time. Rearranged, distance equals speed times time, and time equals distance divided by speed.

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