Running Pace Calculator
Calculate your per-km pace and split times from a target finish time
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
Enter a target finish time for 5K, 10K, half marathon, full marathon, or any custom distance, and this tool instantly shows the required pace per kilometer, average speed, and a split times table for each checkpoint. It's built for runners planning training runs or race-day pacing strategy, and every calculation happens right in your browser with nothing sent to a server.
How to use
- Pick a distance from the tabs — 5K, 10K, Half, Full — or choose Custom to enter any distance in km.
- Enter your target finish time in hours and minutes.
- Your required pace per km (min:sec) and target average speed (km/h) appear instantly at the top.
- Scroll the split times table below to see exactly when to pass each checkpoint.
FAQ
- What intervals does the split times table use?
- For distances of 15 km or less it shows 1 km splits; for longer distances like a half or full marathon it switches to 5 km splits, always ending with the final target distance.
- Can I enter my own custom distance?
- Yes, select the Custom tab to enter any distance in kilometers, down to 0.01 km precision.
- Is my data saved or sent anywhere?
- No, all calculations run instantly in your browser and nothing is stored or transmitted to a server.