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Running Pace Calculator
Convert between running distance, elapsed time, pace and average speed in kilometres or miles. Use Race Pace Calculator mode for a target finish time and optional even-pace splits.
Use this calculator to convert between running distance, elapsed time, pace and average speed.
You can work in kilometres or miles and calculate pace, finish time or distance from the values you know.
Choose a mode and distance unit. Time and pace use separate fields. Changing units changes how entered values are interpreted; split projections assume even pacing.
Calculations run locally in your browser. Your inputs are not saved.
Enter the running values you know.
Example: 5K in 25 Minutes
Static example: 5 km in 25:00 is 1,500 seconds. Pace = 1,500 ÷ 5 = 300 seconds/km = 5:00 min/km. Equivalent mile pace = 300 × 1.609344 = 482.8032 seconds, displayed approximately as 8:03 min/mile. Average speed = 5 ÷ (25 ÷ 60) = 12 km/h.
About this calculator
Pace and average speed
Running pace expresses how much time it takes to cover a unit of distance, usually minutes per kilometre or minutes per mile.
- Average speed expresses the same performance as distance travelled per hour.
- Pace = elapsed seconds ÷ distance. Finish time = distance × pace seconds per unit. Distance = elapsed seconds ÷ pace seconds per unit.
- One mile is exactly 1.609344 kilometres. Multiply seconds/km by 1.609344 for seconds/mile; divide seconds/mile by 1.609344 for seconds/km.
- Average speed = distance ÷ elapsed hours. Kilometres/hour converts to miles/hour by dividing by 1.609344.
- Calculated values retain full precision. Pace and time displays round to the nearest second; distance and speed normally show two decimals.
Example: 10K Target in 50 Minutes
Static example: 10 km in 50 minutes is 3,000 seconds ÷ 10 km = 300 seconds/km, or 5:00/km. The corresponding average speed is 12 km/h.
Even-pace projection assumptions
Race split projections assume perfectly even pacing. Real-world pacing may vary because of terrain, weather, fatigue, stops and race strategy.
- Kilometre views use useful standard race milestones; mile views show mile-based splits.
- Long custom races show evenly spaced milestone splits plus the finish, with a maximum of 50 rows.
- The final partial segment uses its actual distance rather than a full-unit split.
- This calculator provides mathematical running estimates and is not a training or medical recommendation.
Frequently asked questions
How do I calculate running pace?
Divide elapsed time by distance. Convert time to seconds first, then format the seconds per kilometre or mile as minutes and seconds.
How do I convert min/km to min/mile?
Convert the pace to seconds, multiply by 1.609344 and format the result. For example, 5:00/km is 300 seconds/km, equivalent to about 8:03/mile.
What is the difference between pace and speed?
Pace is time per unit of distance; speed is distance per unit of time. They express the same distance-and-time relationship in different ways.
How do I calculate a target race pace?
Divide target finish time by race distance. The result is the constant average pace corresponding to that target; it is not a recommendation of which target to choose.
What is an even split?
An even split assumes a constant pace throughout the distance. Equal-distance segments have the same modeled time; a final partial segment has a proportionally different time.
Why might actual race splits differ from the calculator?
Terrain, weather, fatigue, stops and race strategy can change actual pacing. These projections do not account for those real-world factors or provide a coaching plan.
This calculator provides general mathematical fitness estimates only and is not medical advice or a training prescription.