Speed calculator
Average speed over the entire journey.
Speed = distance ÷ time
Formula
Distance ÷ time
How the calculation works
Find average speed from distance and elapsed time. Enter each measurement in the unit shown beside the input. The result updates when you change a value; incomplete or unsupported inputs display an explanation.
Worked example
150 km traveled in 2 hours gives an average speed of 75 km/h.
When to use this calculator
Use total elapsed time, including stops, for a journey average.
Common mistakes and limits
An average speed is not the instantaneous speed shown at one moment.
Check your result
Check that all measurements describe the same object or time period. Repeat the calculation with unrounded values, then round only the final quantity to a precision suitable for the task.
Frequently asked questions
Does this calculator need an account?
No. Calculations run in your browser without an account.
How precise is the displayed result?
The display rounds to six decimal places. Measurement uncertainty can be larger than this rounding.
Sources & references
- Speed and Velocity — OpenStax
