Explanation and example

For constant speed, distance equals speed times time: s = v × t. Leave the quantity you want to find blank and enter the other two. The fields use metres, metres per second and seconds. Convert other units before entering a value.

Example: travelling at 12 m/s for 30 seconds covers 360 metres. Covering the same 360 metres at 10 m/s takes 36 seconds. Substituting the answer back into s = v × t checks either calculation.

Limits

The model assumes speed remains constant throughout the interval. Stops, acceleration and changes of direction need a different model. A zero distance over zero time cannot determine a unique speed.