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Pace is the runner's core number: how long it takes to cover one kilometre or one mile. It's how training plans, race goals and treadmill settings are expressed — "a 5:00 per km pace" says everything a speed in km/h can't at a glance. Enter how far you ran and how long it took, and this calculator gives your pace and speed.
Enter the distance, its unit and your time in minutes, and the pace per km and per mile plus your speed appear at once.
How is it calculated?
The calculation
Pace = time ÷ distance. Run 10 km in 50 minutes and your pace is 50 ÷ 10 = 5 minutes per kilometre, written 5:00/km. Speed is the inverse: distance ÷ time, so 10 km in 50 minutes (5/6 of an hour) is 12 km/h.
Pace vs speed
- Pace (min/km or min/mile): time per distance — lower is faster. Runners think in pace.
- Speed (km/h or mph): distance per time — higher is faster. Treadmills and cyclists use speed.
They're reciprocals: a 5:00/km pace is 12 km/h. The tool shows both, and pace in both km and miles.
Using pace for goals
Pace makes race planning concrete. To finish a marathon (42.195 km) in 4 hours, you need 240 ÷ 42.195 = 5:41 per km, held for the whole distance. Knowing your target pace lets you check each kilometre against it during the race, rather than guessing from a finish-time estimate.
Where it helps
- Checking your pace after a run
- Setting a target pace for a 5K, 10K, half or marathon
- Converting a treadmill speed to a pace, or vice versa
Worked example
You run 10 km in 50 minutes. Your pace is 50 ÷ 10 = 5.00 minutes per kilometre — 5:00/km — and per mile it's about 8:03/mi (since a mile is longer). Your speed is 10 km ÷ (50/60 h) = 12 km/h. To turn that into a race goal: holding 5:00/km for a half marathon (21.1 km) would finish in about 1:45:30. For a full marathon in exactly 4 hours, you'd instead need a slightly easier 5:41/km — which is why knowing your sustainable pace, not just a finish time, is what makes a race plan realistic.
FAQ
How do I calculate running pace?+
Divide your time by the distance: 50 minutes over 10 km is 50 ÷ 10 = 5:00 per km. The tool gives pace per km and per mile, plus your speed.
What is the difference between pace and speed?+
Pace is time per distance (min/km) — lower is faster; speed is distance per time (km/h) — higher is faster. They're reciprocals: 5:00/km equals 12 km/h.
How do I convert pace per km to pace per mile?+
Multiply the per-km pace by 1.609 (a mile is longer, so the time is greater): 5:00/km is about 8:03/mile. The tool shows both automatically.
What pace do I need for a sub-4-hour marathon?+
About 5:41 per km (or 9:09 per mile), held for the full 42.195 km. That works out to 240 minutes ÷ 42.195 km. Slightly faster gives you a time buffer.
How do I turn a treadmill speed into a pace?+
Pace per km = 60 ÷ speed in km/h. A treadmill at 12 km/h is a 5:00/km pace. Enter your distance and time and the tool shows both.
Is a lower or higher pace better?+
Lower is faster — less time to cover each kilometre. A 4:30/km pace is quicker than 5:00/km. (Speed is the opposite: higher is faster.)