Running Pace Calculator
Pace per km and mile from your distance and time
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Running Pace Calculator
Running pace is the time it takes to cover one kilometre or mile. Set a race distance and goal time to see the pace you must hold, then plan training around it. Even pacing is the most efficient way to hit a marathon or 10K target.
How to use this running pace calculator
Pick a race preset — 5K, 10K, half marathon (21.0975 km) or marathon (42.195 km) — or choose 'custom' and type any distance in kilometers. Then enter your finish time in hours, minutes and seconds and press calculate. You instantly get your pace per kilometer, pace per mile and average speed in km/h, with no sign-up required.
How to read your result
Pace is the time needed to cover one kilometer or one mile, so a lower number means you are faster. Use the per-km split to plan checkpoints — at 6:00/km you should pass 5 km around 30:00 — and use the km/h value to set a treadmill. Comparing the per-km and per-mile figures also helps when a race abroad uses different distance markers.
The formula and the math behind it
Pace per kilometer = total time ÷ distance; the per-mile figure multiplies it by 1.609344, and speed is the inverse: distance ÷ time, expressed in km/h. It is the same simple arithmetic used by race organizers and running watches worldwide. For example, a 4-hour marathon works out to about 5:41 per km, or roughly 10.5 km/h.
Limits and practical tips
The calculator assumes perfectly even splits, but real courses add hills, wind, crowds and late-race fatigue, so treat the result as an average target — many runners deliberately start a touch slower and finish strong. A pace you can hold for 5K will not hold for a marathon. Try our race time predictor, heart rate zone and VO2 max calculators too, and log your runs and meals in the CaloNote app.
Frequently Asked Questions
- What does the running pace calculator do?
- It converts a distance and target finish time into your required pace. Enter a race such as 5K, 10K, half marathon or marathon and your goal time, and the tool returns pace per kilometre, pace per mile and your average speed.
- How do I calculate pace per kilometre?
- Pace equals total time divided by distance. Enter your target time and the distance, and the calculator does the division for you, returning pace per km and per mile so you know exactly how fast each segment needs to be.
- How can I use pace to plan a race?
- Pick your goal finish time and read off the required per-kilometre pace, then practise holding it in training. Running even splits at that pace is usually more efficient than starting fast, so use the figure as your steady target on race day.