A worked example
42.195 km at 5:30/km takes 3:52:04.35, displayed as 3:52:04 after rounding to a second.
Finish time
Estimate elapsed time from a constant pace and distance. Includes 5K, 10K, half-marathon and marathon presets.
YOUR LITTLE WORKBENCH
Finish time
Start with the example, then make it your own. Results update as you type.
How this is calculated
Finish time = distance in km × pace in seconds per km. One mile = 1.609344 km.
YOUR PLAN / LIVE RESULT
Projected finish time
3:52:04- Pace per km
- 5:30 /km
- Pace per mile
- 8:51 /mi
- Average speed
- 10.9091 km/h
- Average speed
- 6.7786 mph
- Distance
- 42.195 km
This is a constant-pace projection, not a prediction of fitness or race performance. The pace input is always minutes and seconds per kilometre, even when the distance is entered in miles.
THE METHOD / 01
Know what goesinto your result.
Finish time = distance in km × pace in seconds per km. One mile = 1.609344 km.
Keep the assumptions clear
This is a constant-pace projection, not a prediction of fitness or race performance. The pace input is always minutes and seconds per kilometre, even when the distance is entered in miles.
A FEW USEFUL ANSWERS
Good to know.
Are my inputs uploaded?
No. Calculations run locally in your browser. The host still receives normal requests for website pages and assets.
Can I keep my result?
Export a CSV, or use Print / PDF and choose Save as PDF in your browser. Inputs are not saved between visits.
Do I need an account?
No sign-up, paid API or subscription is required. Both language versions use the same calculation logic.
STRIDEKIND / TOOLKIT
A little help for every step.
01
Pace calculator
Enter distance and elapsed time to calculate pace per kilometre, pace per mile and average speed.
Open tool03
Race splits
Create an even-pace split card for a target finish time, including the final partial kilometre or mile.
Open tool04
Speed converter
Convert km/h or mph to running pace and calculate a constant-speed 400-metre lap time.
Open tool