Running Pace Calculator
Calculate running pace, time, or distance with kilometer and mile splits plus Riegel race time predictions for 5K, 10K, half, and marathon.
Running Pace Calculator
Calculate running pace, time, or distance. Predict race times with the Riegel formula and view kilometer and mile splits.
Given distance and time, find your pace
Results
Split Table
| Checkpoint | Distance | Split | Cumulative |
|---|---|---|---|
| 1K | 1.000 km | 5:00 | 5:00 |
| 2K | 2.000 km | 5:00 | 10:00 |
| 5K | 5.000 km | 15:00 | 25:00 |
Standard Race Times Predictor
Enter a known race distance and finishing time. We use the Riegel formula T₂ = T₁ × (D₂ / D₁)^1.06 to predict equivalent performances at standard distances.
| Race | Predicted Time | Pace /km | Pace /mi |
|---|---|---|---|
| 5K | 25:00 | 5:00 /km | 8:02 /mi |
| 10K | 52:07 | 5:12 /km | 8:23 /mi |
| Half Marathon | 1:55:00 | 5:27 /km | 8:46 /mi |
| Marathon | 3:59:46 | 5:40 /km | 9:08 /mi |
Frequently Asked Questions
How does it work?
Enter any two of distance, time, or pace and it computes the missing value plus speed in km/h, mph, and m/s. Generates a split table at standard race checkpoints.
What is the Riegel formula?
T2 = T1 x (D2/D1)^1.06 — extrapolates a finish time at a target distance from a known race. Most accurate when the two distances are within a factor of 4.
Which units?
Distance in km, miles, meters, yards. Pace in min/sec per km or per mile. Outputs show metric and imperial side by side.
Is the Running Pace Calculator free to use?
Yes, the Running Pace Calculator is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.
Is my data safe with this tool?
Absolutely. The Running Pace Calculator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the Running Pace Calculator work on mobile devices?
Yes, the Running Pace Calculator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the Running Pace Calculator in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
How do I use the Running Pace Calculator?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The Running Pace Calculator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
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About Running Pace Calculator
Running Pace Calculator is a free, browser-based tool in our Calculator Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.