Speed Calculator
Speed, Distance and Time Calculator works out Average speed and Average velocity from Distance, Displacement and Elapsed time. The default figures on this page give average speed of 10; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
1 step
- Average speed = 100 / 10 = 10
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the Speed, Distance and Time Calculator calculates
Solves the speed, distance and time relationship for whichever quantity is unknown, and handles signed displacement for average velocity.
How to use this Speed, Distance and Time Calculator
Enter Distance, Displacement and Elapsed time. Average speed updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Average speed, Average velocity and Travel time.
The method follows Newtonian mechanics: v = dx/dt, F = ma, J = F dt = dp, and the work-energy relations and BIPM, The International System of Units (SI Brochure).
Research R2426-GT-1: 100 units in 10 units of time example
With Distance: 100, Elapsed time: 10, the calculator returns Average speed: 10. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Average speed, Average velocity and Travel time. The inputs you can vary are Distance, Displacement, Elapsed time, Speed and Initial velocity.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What information do I need for the Speed, Distance and Time Calculator?
You need Distance, Displacement, Elapsed time, Speed, Initial velocity and Acceleration. The page opens with default figures that give average speed of 10, so you can see the scale before entering your own.
What does this Speed, Distance and Time Calculator show?
It shows Average speed, Average velocity, Travel time, Distance, Final velocity and Solved for, with the working and any warnings for your entries.
Can I check how the Speed, Distance and Time Calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.