Pace
calculator.
Enter any two of distance, time and pace to get the third, for a run, a walk or a race. You get pace per mile and per kilometer, speed in mph and km/h, an even-splits table and your finish time for every standard race at that pace.
Covering 5K (5 km) in 28:30 is a pace of 9:10 per mile (5:42 per km), or 6.54 mph (10.53 km/h).
- Pace per mile
- 9:10
- Pace per kilometer
- 5:42
- Speed
- 6.54 mph · 10.53 km/h
- Distance
- 5 km · 3.10686 mi
- Time
- 28:30
- 5K at this pace
- 28:30
pace = time ÷ distance = 1,710 s ÷ 5 km = 342 s/km = 5:42 /km; × 1.609344 = 9:10 /miTime over distance,
split by split.
- Pace = time ÷ distance, time = distance × pace and distance = time ÷ pace. Speed is the reciprocal of pace: mph = 3,600 ÷ seconds per mile.
- 1 mile = 1,609.344 m exactly. A marathon is 42.195 km and a half marathon 21.0975 km, as World Athletics defines them; 5K and 10K are 5,000 m and 10,000 m.
- Times are typed as h:mm:ss or m:ss. Minutes and seconds after the first part must be under 60, and only the last part may have decimals.
- Nothing is rounded until display. Paces and times are shown to the nearest second, and each split is the difference of the rounded elapsed times, so the splits add up to the finish time.
- Splits assume an even pace from start to finish.
How do you calculate running pace?
Divide the time by the distance. A 5K in 28:30 is 1,710 seconds ÷ 5 km = 342 seconds per km, which is 5:42 per km. A mile is 1.609344 km, so the pace per mile is 342 × 1.609344 = 550.4 seconds, or 9:10 per mile. Pace is the reverse of speed: 5,000 m in 1,710 s is 2.92 m/s, or 6.54 mph (10.53 km/h).
pace (s per km) = time (s) ÷ distance (km)
pace per mile = pace per km × 1.609344How do you work out a finish time from a pace?
Multiply the distance by the pace. A marathon is 42.195 km, or 26.2188 miles. At 11:00 per mile (660 seconds) that is 26.2188 × 660 = 17,304 seconds, a finish of 4:48:24. At 9:00 per mile it is 3:55:58. Choose “Finish time”, pick the race and enter your pace or speed.
time = distance × paceHow far is a marathon and a half marathon?
World Athletics gives the marathon as 26 miles 385 yards, or 42.195 km. That distance comes from the 1908 London Olympics. A half marathon is exactly half: 21.0975 km, or 13.1094 miles. Certified courses are measured along the shortest route a runner could take, so a GPS watch that follows your real line usually reads a little long. That is why the calculator works from the official distance.
How do you convert pace per mile to pace per km?
Divide the pace per mile by 1.609344, or multiply the pace per km by it. 8:00 per mile is 480 ÷ 1.609344 = 298.3 seconds, or 4:58 per km. To get speed, divide 60 by the pace in minutes: 60 ÷ 8 = 7.5 mph. Going the other way, 7.8 mph is 60 ÷ 7.8 = 7.69 minutes, or 7:42 per mile.
pace per km = pace per mile ÷ 1.609344
mph = 60 ÷ pace (minutes per mile)What are even splits?
Splits are the times at each mile or kilometer marker. With even pacing, every split is the same: a 2:00:00 half marathon is 5:41 per km, so you should pass 5 km at 28:26, 10 km at 56:53 and 20 km at 1:53:45. Many coaches suggest starting slightly slower than goal pace on race day, but an even-split table is the usual starting point. Switch the table between miles and kilometers to match the course markers.
How far do I walk or run in a given time?
Divide the time by the pace. 45 minutes at 5:00 per km is 2,700 ÷ 300 = 9 km, or 5.59 miles. A walk of 1 hour at 3 mph is 3 miles. If you count steps instead, the steps to distance calculator turns a step count into miles or kilometers, and you can then enter that distance here to find your walking pace.
distance = time ÷ pace = time × speedWorked examples.
Pace for a 5K
A 5K finished in 28:30.
9:10 per mile (5:42 per km), 6.54 mph.
Load this exampleMarathon finish time at 11:00 per mile
A marathon run at an even 11:00 per mile.
4:48:24.
Load this exampleHalf marathon goal of two hours
A half marathon in 2:00:00, with splits per kilometer.
5:41 per km (9:09 per mile).
Load this exampleDistance in 45 minutes
45 minutes at 5:00 per km.
9 km (5.59 miles).
Load this exampleTreadmill speed to pace
A 3-mile run at a steady 7.8 mph on a treadmill.
23:05 for 3 miles, at 7:42 per mile.
Load this exampleWhat this calculator
does not do.
- It assumes an even pace. Real splits change with hills, wind, heat, crowding and fatigue.
- It does not predict a race time from a different distance. The finish times listed for other races are at the same pace, which most runners cannot hold over a longer race.
- A GPS watch often measures a course long, so its pace can differ slightly from the pace by the official distance.
- It is for planning and training arithmetic only, not medical or coaching advice.
Common questions.
How do I calculate my pace?
Divide your time by your distance. 30 minutes for 5 km is 6:00 per km, which is 9:39 per mile.
What pace is a 4-hour marathon?
9:09 per mile, or 5:41 per km: 14,400 seconds ÷ 26.2188 miles = 549.2 seconds per mile.
Is a marathon 26.2 miles?
26.2 is a rounding. The official distance is 26 miles 385 yards, which is 42.195 km or about 26.2188 miles.
How do I enter a time?
As h:mm:ss, for example 1:45:30, or m:ss for times under an hour, such as 28:30. A single number is read as minutes.
Can I use speed instead of pace?
Yes. Under “Pace given as” choose mph or km/h and type the speed, for example from a treadmill display.
- World Athletics: Marathon — “athletes run a distance of 26 miles and 385 yards (42.195km)”; distance set at the 1908 London Olympics
- World Athletics: Half marathon — “exactly half the length of a marathon, at 13.1094 miles or 21.0975km”
- NIST Special Publication 811, Appendix B.8: Factors for units listed alphabetically — mile = 1.609 344 E+03 m and mile per hour = 4.4704 E−01 m/s, both exact
- Compendium of Physical Activities: Unit Conversions — pace in min per mile from mph (60 ÷ mph); worked example 7.8 mph = 7:42 per mile
Distances are converted to meters and times to seconds, and the missing value comes from pace = time ÷ distance. Splits and race times are computed from the unrounded speed and rounded to the second only for display. Our tests check hand-worked cases, including Strava’s published marathon, 10K and 5K times and the Compendium’s 7.8 mph example. They also run 500 seeded random cases for the round trip between all three modes, agreement between pace and speed entry, splits that add up to the finish, and time parsing. Validation tests cover every field.
Built and reviewed by CalculatorLab against the sources above; every worked example on this page is re-checked by our automated test suite before each release. How we build and check calculators. Found a problem? Tell us.