Calculate running pace, speed, time, and race predictions
What is the Pace Calculator?
The pace works like this: it converts between finish time, distance and running pace, and shows splits per kilometre or mile. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the Pace Calculator
Enter the values the calculator asks for.
Double-check the unit or period next to each field (per month vs per year, cm vs m).
Read the result together with the breakdown shown beneath it.
Adjust one input at a time to compare scenarios side by side.
Features
Calculate running pace, speed, time, and race predictions
Instant result, no page reload
Works in any modern browser, desktop or mobile
Free with no signup
Common mistakes to avoid
Mixing units or periods between fields
Rounding inputs before the final calculation
Treating estimates as guarantees for major decisions
Examples
Input
Result
10 km in 52:30
Pace 5:15 /km · 8:27 /mile
Best used for
Getting a reliable answer for pace without installing an app
One-off tasks done in under a minute from any device
Checking results before committing them to something important
Working on a phone where desktop software is unavailable
Privacy
Calculations run in your browser. Enter only what the calculation needs.
Frequently asked questions
What is a good pace for beginners?
6:00-7:00 per kilometre is a common comfortable range; pace improves quickly in the first months of consistent running.
How do I convert a finish time into a training pace?
Enter the distance and target time - the per-kilometre and per-mile splits appear instantly, and long-run/training zones are typically 60-90 seconds slower per kilometre than race pace.
Does it handle arbitrary distances?
Yes - the distance field accepts decimals, so 21.1 for a half marathon or 42.195 for the full distance works with the same split math.