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01Health & Fitness toolCalculated result
Running Pace Calculator
Pace, speed and race times from a distance and time.
100% FreeRuns instantlyNo watermark
- 1Enter detailsAdd the numbers for your scenario.
- 2CalculateVootkit updates the result instantly.
- 3ReviewCheck totals, notes and breakdowns.
Private by designProcessed on your device where possible.
Works on any deviceDesktop, tablet and mobile browsers.
No installationOpen the page and start working.
Always free coreUse the free plan for everyday tasks.
How to use Running Pace Calculator
Vootkit updates the result instantly.
02Check totals, notes and breakdowns.
03Copy the answer into your workflow.
04Your files stay private
Your work is processed locally in your browser where possible and is never added to a Vootkit upload library.
Learn more about privacyRunners think in minutes per kilometre; race results are published in total time; treadmills are labelled in kilometres per hour. They are the same fact expressed three ways, and converting between them in your head mid-run is how people mis-pace a race.
What Running Pace Calculator does
Takes a distance and a finishing time and returns pace per unit, speed, and the equivalent pace in the other unit — so a 5:00/km runner immediately sees 8:03/mile.
Also projects the same effort onto half marathon (21.0975 km) and marathon (42.195 km) distances, using the exact official figures rather than rounded ones.
Inputs and outputs
| Distance units | Kilometres or miles |
|---|---|
| Time input | Hours, minutes, seconds |
| Pace output | Minutes per km and per mile |
| Speed output | km/h or mph |
| Half marathon | 21.0975 km / 13.1094 mi |
| Marathon | 42.195 km / 26.2188 mi |
| Conversion factor | 1 mile = 1.609344 km, exact |
| Minimum distance | 0.01 |
Detailed steps
- Enter the distance and choose km or miles.
- Enter the time as hours, minutes and seconds.
- Read pace, speed, and the equivalent in the other unit.
Worth knowing
The race projections assume you hold the same pace over a much longer distance, which almost nobody does. As a rough correction, expect roughly 5% slower per doubling of distance — a 25-minute 5K projects to about 52 minutes for 10K in the arithmetic, but 53–55 is the realistic range.
Frequently Asked Questions
Why is my projected marathon time so optimistic?
Because it is pure arithmetic — your current pace multiplied by 42.195 km. It cannot model fatigue, fuelling or the wall. Established predictors like Riegel apply a fatigue exponent; treat the projection here as a ceiling on your best case.
How do I convert pace between km and miles?
Multiply a per-kilometre pace by 1.609344 to get per-mile. The tool shows both, which avoids the common error of converting the distance and forgetting to convert the pace.
What pace is a treadmill speed?
Divide 60 by the km/h figure to get minutes per km — 12 km/h is 5:00/km. The tool reports speed alongside pace so you can set a treadmill directly.
Are the race distances exact?
Yes. A marathon is 42.195 km and a half is 21.0975 km by definition. Rounding to 42 km would understate a finishing time by about half a minute at typical paces.
Is Running Pace Calculator free?
Yes. The Vootkit free plan includes 5 tool runs a day. Upgrade to Vootkit Pro for unlimited daily use, an ad-free workspace and saved workflows.
Are my files uploaded?
No. Running Pace Calculator runs entirely in your browser — your file is processed on your own device and never sent to a server. There is nothing for us to store or delete.
Do I need to install anything?
No. Running Pace Calculator works in any modern browser on desktop, tablet or phone. Open the page and start.
How often can I use it? Is there a daily limit?
On the free plan you get 5 tool runs a day. When you reach the limit you'll see a prompt to upgrade, and it resets the next day. Vootkit Pro removes the cap entirely for unlimited daily use.
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This tool processes everything locally in your browser. You can disconnect from the internet after the page loads and it will still work.