Running Pace Calculator: min/km, km/h and Miles
Pace is how long one unit of distance takes you, and it comes from one division: total time divided by distance. Enter the distance you covered and the clock time it took. The calculator works in kilometers and returns min/km plus the matching km/h; the mile column is in the table below.
Your pace
5:00/km
Equals 12.0 km/h.
How we got this number
Pace = time ÷ distance = 25min ÷ 5 km = 5:00/km
The arithmetic behind it
Pace = total time ÷ distance. Speed is the same fact turned inside out: speed = distance ÷ time in hours. Multiply pace in minutes per kilometer by speed in km/h and you always get 60, because there are 60 minutes in an hour.
Worked out: 10 km in 50 minutes gives 50 ÷ 10 = 5:00/km, which is 10 ÷ (50/60) = 12 km/h. The same effort in US units is 8:03 per mile at 7.46 mph, because a mile is 1.609344 km exactly by NIST’s conversion table — not the rounded 1.6 most charts use.
Pace, speed and the mile column side by side
| Pace (min/km) | Speed (km/h) | Speed (mph) | Pace (min/mile) |
|---|---|---|---|
| 4:00 | 15.00 | 9.32 | 6:26 |
| 4:30 | 13.33 | 8.28 | 7:15 |
| 5:00 | 12.00 | 7.46 | 8:03 |
| 5:30 | 10.91 | 6.78 | 8:51 |
| 6:00 | 10.00 | 6.21 | 9:39 |
| 6:30 | 9.23 | 5.74 | 10:28 |
| 7:00 | 8.57 | 5.33 | 11:16 |
The rule of thumb worth memorizing: a min/mile pace is about 1.6 times the min/km pace. Nine and a half minutes per mile is close to six minutes per kilometer, and the gap between the two numbers widens as you slow down.
The four road distances, in both units
World Athletics standardized the marathon at 26 miles 385 yards — 42.195 km — in 1921, after the 1908 London course was stretched to finish in front of the royal box. The half is exactly half of it, 13.1094 miles or 21.0975 km. The 5K and 10K carry their metric names even on American start lines, which is why every US race bib says 5K and every finish-line clock is a metric split.
| Race | Kilometers | Miles |
|---|---|---|
| 5K | 5 | 3.11 |
| 10K | 10 | 6.21 |
| Half marathon | 21.0975 | 13.11 |
| Marathon | 42.195 | 26.22 |
A pace only means something if the course was measured. USATF certifies road courses precisely so performances can be compared between races, and no US road result counts as a record or a ranking without a certified course. A GPS watch that reads 3.24 miles on a 5K is measuring your wandering, not the race.
Pick the calculator for your distance
The pace you can hold falls as the race gets longer, so a single number will not plan four races:
- 5K pace calculator and 10K pace calculator
- Half marathon pace calculator and marathon pace calculator
- Walking pace calculator, for anything slower than a jog
Related pace tools
- Pace to km/h converter — the same conversion, both directions, live
- Treadmill speed to pace — for the number on the console
- Track workout pace calculator — for 400s and 800s
- Negative split calculator — for splitting a race in two
To put the pace inside a training intensity rather than a race plan, the heart rate zone calculator and the max heart rate calculator work from the other side of the same effort.
Frequently asked questions
How do you calculate running pace?
Divide total time by distance. Ten kilometers in 50 minutes is 50 ÷ 10 = 5:00 per kilometer. There is no coefficient and no error band in this one — it is arithmetic, unlike an estimate such as VO2 max.
What is pace in running?
The time it takes to cover one unit of distance, written as minutes and seconds: 5:00/km, or 8:03/mile. Runners use it instead of speed because it drops straight into race math — 5:00/km means each kilometer marker arrives five minutes apart.
How do I convert min/km to min/mile?
Multiply the min/km figure by 1.609344, the exact number of kilometers in a mile per NIST. A pace of 6:00/km is 6 × 1.609344 = 9.66 minutes, or 9:39 per mile.
Does this calculator work in miles?
It runs on kilometers and returns min/km plus km/h. For miles, use the conversion table below — or enter your distance in kilometers, since a 5K is 3.11 miles, a 10K is 6.21, a half is 13.11 and a marathon is 26.22.
Why is my race pace slower than my training pace?
Usually it is not — most runners race faster than they train. What changes with distance is the pace you can hold: the ceiling drops as the race gets longer, which is why each distance below gets its own target.
Sources
- World Athletics — Marathon (26 miles 385 yards, standardized at 42.195 km in 1921)
- World Athletics — Half Marathon (13.1094 miles or 21.0975 km)
- NIST Guide to the SI, Appendix B.9 — Factors for Units Listed Alphabetically (1 mile = 1.609 344 km exactly)
- USA Track & Field — Course Certification
Written by Lucas Silva · Reviewed by Lucas Silva · Updated on August 15, 2026