Pace (min/km) Helper
Convert a running pace in minutes per kilometre to speed in km/h and predict finish time for a chosen distance. Includes a 5:30 pace example and marathon check.
Results
Speed
Finish time
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Educational estimates · not financial advice · free, no signup
Formula / how it works
Pace in seconds per km = minutes × 60 + seconds. Speed (km/h) = 3,600 ÷ pace in seconds. Finish time = pace × distance.
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
Runners talk in pace, minutes per kilometre, while treadmills and many devices show speed in kilometres per hour. This helper converts between them and multiplies pace by a race distance to predict a finish time. It is a simple way to set a target, such as a 55-minute 10K, or to see what a given pace means over a half or full marathon. The calculation assumes you hold an even pace for the whole distance. Real races include hills, weather, fatigue and starts, so use the result as a target and expect variation.
When to use / who it helps
- You want to know what pace is needed for a goal time.
- You want to convert a pace to km/h for a treadmill.
- You are setting split targets for a race.
- You want to estimate a marathon finish from a training pace.
- You are comparing training sessions at different paces.
How to use
Steps
- Enter the pace minutes and seconds per kilometre.
- Enter the race distance in kilometres.
- Read the speed in km/h.
- Read the finish time for that distance.
- Adjust pace by 5–10 seconds to see the effect.
- For miles, convert distance first (1 mile = 1.609344 km).
How to interpret results
- Every 10 seconds per km changes a 10K by 100 seconds.
- Faster pace means a smaller number of minutes per kilometre.
- Even pacing is rarely perfect; positive or negative splits are normal.
- Predictions from short to long races usually overestimate your longer-distance ability because fatigue accumulates.
- Treadmill speeds are not equal to outdoor effort because there is no wind.
Common mistakes & gotchas
- Entering seconds above 59.
- Using miles distance with a km pace.
- Assuming the 10K pace can be held for a marathon.
- Reading speed as pace or the reverse.
- Ignoring terrain and weather in the target.
Worked example
Worked example — 5:30 per km over 10 km
- Pace in seconds: 5 × 60 + 30 = 330 s per km.
- Speed: 3,600 ÷ 330 ≈ 10.91 km/h.
- Finish time for 10 km: 330 × 10 = 3,300 s = 55:00.
- Marathon at the same pace: 330 × 42.195 ≈ 13,924 s ≈ 3:52:04, though most runners slow down late.
Result: 10.91 km/h and a 55:00 finish for 10 km.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
Pace in seconds per km = minutes × 60 + seconds. Speed (km/h) = 3,600 ÷ pace in seconds. Finish time = pace × distance.
Frequently asked questions
How do I convert pace to speed?
Divide 60 by the pace in minutes per km, or 3,600 by the pace in seconds.
What pace is a 50-minute 10K?
5:00 per km.
Is the predicted time realistic?
It assumes an even pace; real races vary.
Can I use miles?
Convert the distance to kilometres, or convert the pace by dividing by 1.609344.
How is this different from a pace per mile?
Minutes per mile is 1.609344 times minutes per kilometre.
How fast is a 6:00 min/km pace?
10 km/h.