How to Calculate Running Pace and Speed
Convert running time and distance into min/km, min/mile, and average speed.
Running pace measures time per unit of distance, while speed measures distance per unit of time. They describe the same effort from different perspectives but use different units.
Basic pace formula
Pace = elapsed time ÷ distance
If you run 5 km in 25 minutes, your average pace is 5 minutes per kilometer, usually displayed as 5:00 min/km. To express pace in minutes per mile, convert the distance into miles first or multiply minutes per kilometer by approximately 1.609344.
Speed from pace
Speed = distance ÷ elapsed time
A 5 km run completed in 25 minutes is 5 ÷ (25/60) = 12 km/h. You can convert to miles per hour by dividing km/h by about 1.609344.
Projecting finish time
For a constant average pace, multiply the planned race distance by your pace. A 5:00 min/km pace produces a projected 10 km time of 50 minutes. Longer-distance performance is rarely a simple linear extension: fatigue, terrain, temperature, and pacing strategy affect actual finishing time.
Moving time versus elapsed time
Elapsed time includes pauses unless you explicitly exclude them. Some fitness devices report moving pace separately. Comparing moving pace from one activity with elapsed pace from another can be misleading. Use the same definition when tracking progress.
Common pacing errors
Do not read 5:30 as 5.30 decimal minutes: 5 minutes 30 seconds is 5.5 minutes. Watch unit labels when switching between miles and kilometers. GPS measurements may be imperfect, and treadmill pace can differ from outdoor routes.
Using pace to plan training
A pace calculator is useful for interval splits, race targets, and comparing training sessions. However, a calculated training pace is not a substitute for considering your conditioning, recovery, health, and environmental conditions. Start with manageable targets and adapt as needed.