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Running pace calculator

Choose what you want to find: pace, time or distance. Enter the other two values and the running pace calculator shows your pace, speed, splits and the times for the standard race distances.

Source: NIST SP 811, NIST Special Publication 811, Appendix B.8 – mile (international) = 1.609 344 km (exact). Updated: .

km / mi
In the selected unit. Half marathon = 21.0975 km (13.109 mi), marathon = 42.195 km (26.219 mi).
As mm:ss or h:mm:ss, e.g. 50:00 or 1:45:30.
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Result

Result
5:00 min/km (8:03 min/mi)
Time
50:00
Distance
10 km (6.214 mi)
Speed
12.00 km/h (7.46 mph)
Splits
DistanceSplit time
1 km5:00
2 km10:00
3 km15:00
4 km20:00
5 km25:00
6 km30:00
7 km35:00
8 km40:00
9 km45:00
10 km50:00
Race times at this pace
RaceTime
5K25:00
10K50:00
Half marathon (21.0975 km)1:45:29
Marathon (42.195 km)3:30:59
The calculation assumes an even pace; hills, wind and drink stops change your real time. The figures are a guide and are not a substitute for medical advice.

How it is calculated

How running pace is calculated

Pace is the time per kilometre (or per mile): pace = time ÷ distance. The two reverse forms are time = pace × distance and distance = time ÷ pace. Speed is the inverse: km/h (or mph) = 60 ÷ pace in minutes.

How to calculate running pace

  1. Choose what to calculate – pace, time or distance – and the unit (km or miles).
  2. Enter the two values you know, e.g. distance and time.
  3. Read pace, speed, split times and times for standard race distances.

Worked example

10 km in 50:00: 3,000 s ÷ 10 km = 300 s per km = 5:00 min/km, i.e. 60 ÷ 5 = 12 km/h. Per mile that is 300 s × 1.609344 = 482.8 s = 8:03 min/mi (7.46 mph). At this pace a marathon takes 42.195 × 300 s = 12,658.5 s ≈ 3:30:59.

Kilometres and miles

One international mile is exactly 1.609344 km (NIST SP 811). A pace of 5:00 min/km therefore equals 8:03 min/mi, and 8:00 min/mi equals 4:58 min/km.

Standard race distances

RaceLength
5K / 10K5 or 10 km (3.107 or 6.214 miles)
Half marathon21.0975 km (13.109 miles)
Marathon42.195 km (26.219 miles)

Splits assume an even pace. The results are a training aid and do not replace medical advice – if you have a health condition, get checked before hard training.

More running calculators: predict times for other distances with the race time predictor, set training zones with the heart rate zone calculator, and estimate fitness with the VO2 max calculator.

Frequently asked questions

What does pace mean in running?

Pace is the time you need for one kilometre or one mile, e.g. 5:30 min/km. The smaller the number, the faster you run.

How do I convert pace to speed?

Divide 60 by the pace in minutes. 5:00 min/km is 60 ÷ 5 = 12 km/h; 10:00 min/mi is 6 mph.

What pace do I need for a sub-4-hour marathon?

4 hours are 14,400 s; divided by 42.195 km that is 341.3 s, so about 5:41 min/km or 9:09 min/mile.

How do I enter the time?

As minutes:seconds (50:00) or hours:minutes:seconds (1:45:30). With two parts the minutes may exceed 59, e.g. 95:00.

Why do my race splits differ from the table?

The calculator assumes an even pace. The start, hills, wind and aid stations shift your real splits, and GPS watches often measure a little too much distance.

What pace do I need for 10 km in 50 minutes or a half marathon under 2 hours?

10 km in 50 minutes = 5:00 min/km (12.0 km/h), in 60 minutes = 6:00 min/km. Half marathon in 2:00 h = 5:41 min/km (10.5 km/h), in 1:45 h = 4:59 min/km, in 1:30 h = 4:16 min/km (14.1 km/h). The marathon paces are the same at double the time: 4:00 h = 5:41, 3:30 h = 4:59, 3:00 h = 4:16 min/km.

Sources and legal basis

As of: · Editorial policy

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