Running
Running Distance Calculator
Updated 7 Nov 2026 · Source: NIST unit conversion factors ↗
Type your average pace per mile and how long you ran, and the calculator shows how far you went in miles and kilometers. It works for a finished run or for planning one.
Worked example
- 45:00 ÷ 9:30 per mile = 2,700 s ÷ 570 s = 4.74 miles
Miles covered by pace and time
| Pace per mile | 20 min | 30 min | 45 min | 60 min | 90 min |
|---|---|---|---|---|---|
| 7:00 | 2.86 | 4.29 | 6.43 | 8.57 | 12.86 |
| 8:00 | 2.50 | 3.75 | 5.63 | 7.50 | 11.25 |
| 9:00 | 2.22 | 3.33 | 5.00 | 6.67 | 10.00 |
| 10:00 | 2.00 | 3.00 | 4.50 | 6.00 | 9.00 |
| 11:00 | 1.82 | 2.73 | 4.09 | 5.45 | 8.18 |
| 12:00 | 1.67 | 2.50 | 3.75 | 5.00 | 7.50 |
| 13:00 | 1.54 | 2.31 | 3.46 | 4.62 | 6.92 |
Distance is just time divided by pace
Pace tells you how many seconds each mile takes. Divide the total seconds you ran by the seconds per mile and you get miles. With the default inputs, 45 minutes at 9:30 per mile comes out to 4.74 miles, or 7.62 km.
The math is exact, so the result is only as good as the pace you type in. If your pace is a guess, the distance is a guess too.
Getting a pace number you can trust
The best pace comes from a run on a measured route. A standard outdoor track is 400 m per lap in the inside lane, so four laps are 1,600 m, just 9.3 m short of a mile. Time a few laps at your normal effort and you have a solid pace to work with.
On a treadmill, the belt speed gives you pace directly: 6.0 mph is a 10:00 mile. The treadmill pace chart lists every common speed. A GPS watch or phone app also reports pace, but read the next section before you trust it on every route.
Why your GPS and a measured route can disagree
Satellite signals bounce off tall buildings and fade under heavy tree cover. The watch then guesses your track, and a run with many sharp turns can come out a bit long or a bit short.
If your watch says 5.2 miles on a loop you know is 5.0, use the known distance and your total time to work out your true pace. That number will be more useful for the next run than the watch's figure.
Planning a run by time instead of miles
Many runners plan easy days by minutes, not miles. That keeps the effort steady on hilly days, hot days and tired days, when pace slows down on its own. This calculator turns those minutes back into miles so you can still log your weekly total.
The table below the tool shows how far common paces take you in 20 to 90 minutes. At a 10:00 pace, an hour is 6.00 miles; at 12:00, the same hour is 5.00 miles. A slower pace for the same time is not a worse run, just a shorter one.
Miles, kilometers and race distances
One mile is exactly 1,609.344 m, so 1 km is about 0.62 miles. The tool shows both. If you think in kilometer pace, convert it first with the km to mile pace converter.
Want to know whether a run was longer than a 5K (3.107 miles) or a 10K (6.214 miles)? Compare the result with those numbers, or use the pace calculator to go the other way, from a distance and time to a pace.
Related pages
Running Cadence, VO2 Max Calculator, How Long Is a Half Marathon?, How Far Is a 5K?
Questions
How far do I run in 30 minutes?
It depends on your pace. At 10:00 per mile you cover 3.00 miles, at 12:00 per mile 2.50 miles, and at 8:00 per mile 3.75 miles.
Should I enter my moving time or my total time?
Use the time that matches your pace. If your watch paused at stoplights and gave a moving pace, enter the moving time too, or the distance will come out too long.
Can I use this for walking?
Yes. The math is the same for any pace. Enter a walking pace such as 17:00 per mile and the time you walked.
Why does my result differ from my running app?
The app measures distance from GPS points, which can drift. This tool trusts the pace you enter, so a pace from a measured route gives the more reliable answer.
How we calculate: every formula, with its author and year, is on our method page; data sources and their licenses are on sources.
gymnical.com gives estimates from published formulas and public data. It is not medical advice and not a training prescription. Last reviewed November 2026.