Running Pace Calculator: Pace, Time & Race Splits
Find minutes per mile or kilometer, finish time, and even-pace splits. Enter any two of distance, time, and pace.
What Is Running Pace?
Running pace is the time it takes to cover one unit of distance, usually minutes per mile or minutes per kilometer. It is the inverse of speed. A 25-minute 5K is 5:00 per kilometer and 8:03 per mile. That is the same effort described as 12 km/h or 7.46 mph.
How to Use the Running Pace Calculator
- Choose Pace, Finish time, or Distance. The tool solves the missing value from the other two.
- Enter a custom distance or tap a race chip. Half marathon and marathon use 21.0975 km and 42.195 km, not 13.1 and 26.2.
- Enter time as mm:ss or hh:mm:ss. A two-part clock is always minutes and seconds.
- Read min/mile, min/km, mph, and km/h. Open race projections or splits when you want a chart.
Running Pace Formula
The calculator keeps one unrounded relationship and rounds only for display:
- Pace (seconds per km) = time in seconds ÷ distance in km
- Pace (seconds per mile) = seconds per km × 1.609344
- Finish time (seconds) = distance in km × seconds per km
- Distance (km) = elapsed seconds ÷ seconds per km
- Speed (km/h) = 3600 ÷ seconds per km
- Speed (mph) = 3600 ÷ seconds per mile
Example: 1,000 meters is 1 km. 5:00 per km is 300 seconds per km, which is exactly 12 km/h. The same pace is 8:03 per mile.
Calculate Pace for 5K, 10K, Half Marathon and Marathon
Official road-race distances are what the chips use. A 5K is 5.000 km. A 10K is 10.000 km. A half marathon is 21.0975 km. A marathon is 42.195 km. Planning from 13.1 or 26.2 miles shifts the last few seconds.
| Goal | min/km | min/mile |
|---|---|---|
| 25:00 5K | 5:00 | 8:03 |
| 50:00 10K | 5:00 | 8:03 |
| 2:00:00 half marathon | 5:41 | 9:09 |
| 4:00:00 marathon | 5:41 | 9:09 |
| Marathon at 5:30/km | 5:30 | 3:52:04 finish |
Pace Per Mile vs. Pace Per Kilometer
US road races and most US treadmills talk in minutes per mile. Track workouts and many training plans talk in minutes per kilometer. They describe the same speed. Multiply seconds per kilometer by 1.609344 to get seconds per mile. An 8:00 mile is 4:58 per kilometer.
| min/mile | min/km | mph |
|---|---|---|
| 6:00 | 3:44 | 10 |
| 7:00 | 4:21 | 8.57 |
| 8:00 | 4:58 | 7.50 |
| 9:00 | 5:36 | 6.67 |
| 10:00 | 6:13 | 6 |
| 11:00 | 6:50 | 5.45 |
| 12:00 | 7:27 | 5 |
| min/km | min/mile | km/h |
|---|---|---|
| 4:00 | 6:26 | 15 |
| 4:30 | 7:15 | 13.3 |
| 5:00 | 8:03 | 12 |
| 5:30 | 8:51 | 10.9 |
| 6:00 | 9:39 | 10 |
| 6:30 | 10:28 | 9.23 |
| 7:00 | 11:16 | 8.57 |
Running Pace and Treadmill Speed
Treadmill consoles usually show mph or km/h. Pace is 3,600 divided by that speed, in seconds per mile or per kilometer. 7.5 mph is 8:00 per mile. 12 km/h is 5:00 per kilometer. Open the treadmill control on the calculator to convert a belt speed without changing your race inputs.
Indoor belt speed and outdoor GPS pace can disagree. The conversion here is arithmetic on the number you enter, not a calibration of a specific treadmill.
How to Read Running Splits
A split is the elapsed clock when you pass a kilometer or mile mark. Even pacing uses one average pace from start to finish. The last row is the finish time, not a rounded sum of already-rounded splits.
The optional 2% negative-split plan spends a little more time on the first half and a little less on the second half, and still lands on the same finish. That is a clock plan. It is not a claim that negative splits will make you faster, and it does not model hills or fatigue.
Real Running Pace Examples
- 25-minute 5K: 5:00/km, 8:03/mile.
- 30-minute 5K: 6:00/km, 9:39/mile.
- 50-minute 10K: 5:00/km, 8:03/mile.
- Two-hour half marathon: 5:41/km, 9:09/mile.
- Four-hour marathon: 5:41/km, 9:09/mile.
- Eight-minute mile: 8:00/mile, 4:58/km, 7.50 mph.
- 30 minutes at 5:15/km: 5.714 km (3.551 mi).
- 5 km in 24:30: 4:54/km, 7:53/mile — 24.5 ÷ 5 = 4.9 minutes per km, then × 1.609344.
Common Running Pace Mistakes
- Treating pace and speed as the same number. 5:00/km is 12 km/h, not 5 km/h.
- Reading a kilometer pace as a mile pace. 5:00/km is 8:03/mile, not 5:00/mile.
- Planning a marathon from 26.2 miles instead of 42.195 km. The extra 0.0188 miles still moves the clock.
- Typing 3:30 for a 3:30:00 marathon. Two-part time is minutes and seconds on this page.
- Using a watch’s instantaneous GPS pace as if it were the average you just typed.
- Treating a constant-pace projection as a guaranteed race result. Course, weather, and fitness still decide the day.
- Calling one numeric pace a universal “half-marathon effort.” The same 5:00/km is easy for some runners and unsustainable for others.
Frequently Asked Questions
- How do I calculate running pace?
- Divide total time by distance. 25 minutes for 5 km is 5:00 per km. This page does the unit conversion and shows the matching mile pace.
- How many minutes per mile is a 25-minute 5K?
- 8:03 per mile, or 5:00 per kilometer.
- What pace is needed for a four-hour marathon?
- About 5:41 per km and 9:09 per mile on the official 42.195 km course, at even pace.
- How do I convert min/km to min/mile?
- Multiply the kilometer pace, in seconds, by 1.609344. 5:00/km becomes 8:03/mile.
- How do I convert treadmill mph to running pace?
- Minutes per mile = 60 ÷ mph. 7.5 mph is 8:00 per mile. The treadmill box on the calculator does the same conversion.
- What is the difference between running pace and running speed?
- Pace is time per distance. Speed is distance per time. They invert each other: 3600 ÷ seconds per mile = mph.
- How do I calculate mile splits?
- Open Splits and choose per mile. Each row is elapsed time at that mile. The last row equals the calculated finish.
- Can I calculate running distance using time and pace?
- Yes. Choose Distance. 30:00 at 5:15/km is 5.714 km.
- Is this calculator free?
- Yes. No account is required.
- Does this calculator save my running data?
- No. Distance, time, and pace stay in this browser tab. They are not uploaded or written to a database. A share link only repeats the numbers you choose to put in the URL. Pasted personal notes are not part of this tool.