What this calculator does
Speed, distance and time are linked by a simple relationship. This calculator solves for any one of the three when the other two are known.
Formula used
Speed equals distance divided by time. Distance equals speed multiplied by time. Time equals distance divided by speed.
How to read the result
Use consistent units. This calculator uses kilometres, hours and kilometres per hour, then also shows miles per hour where speed is calculated.
Assumptions
- Assumes constant average speed.
- Uses kilometres and hours.
- Does not account for acceleration, stops, terrain or traffic.
Sources and checks
This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.
Frequently asked questions
Is this average speed or instant speed?
It is average speed across the whole distance and time. Instant speed can change moment by moment.