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Pace Calculator

Calculate running pace, finish time, or distance — enter any two and solve the third. Shows pace per mile and per kilometer, speed, and finish times for common race distances.

Pace per Mile

8:03 /mi

Pace per Kilometer
5:00 /km
Speed
7.46mph
Speed
12.00km/h

Your finish times at this pace

RaceFinish Time
5K25:00
10K50:00
Half Marathon1:45:29
Marathon3:30:59
Pace per Mile8:03 /miView results

Enter any two of time, distance, and pace, and this calculator solves for the third. Switch the mode to choose what you want to find — your pace from a finished run, the finish time for a target distance and pace, or how far you'd go at a given pace and time. It also shows your speed and finish times for common race distances.

Formula

The three quantities are linked by one relationship:

pace     = time ÷ distance
time     = pace × distance
distance = time ÷ pace

Internally every value is converted to seconds and metres, the missing quantity is solved, then formatted back into your chosen units.

Pace gets smaller as you get faster (less time per mile), while speed gets larger. A 5:00/km pace equals 12 km/h.

Common race distances

RaceDistance
5K5 km (3.11 mi)
10K10 km (6.21 mi)
Half Marathon21.0975 km (13.11 mi)
Marathon42.195 km (26.22 mi)

Examples

Pace from a 10 km run in 50:00

3,000 seconds ÷ 10 km = 300 s/km = 5:00 per kilometer (about 8:03 per mile, or 12.0 km/h). At that pace a marathon would take about 3:30:59.

Finish time for a half marathon at 5:00/km

21.0975 km × 300 s/km = 6,329 seconds = 1:45:29.

Frequently asked questions

How do I calculate running pace?
Pace is your time divided by distance. Convert the time to a single unit (seconds) and divide by the distance, then express the result as minutes and seconds per mile or per kilometer. For example, 50 minutes for 10 km is 3,000 seconds ÷ 10 km = 300 seconds = 5:00 per kilometer.
What is the difference between pace and speed?
Pace is time per distance (for example 5:00 per kilometer) and gets lower as you get faster. Speed is distance per time (for example 12 km/h) and gets higher as you get faster. They describe the same effort from opposite directions — this calculator shows both.
How do I convert pace between miles and kilometers?
Multiply a per-mile pace by 0.6214 to get per-kilometer pace, or multiply a per-kilometer pace by 1.6093 to get per-mile pace. A 5:00/km pace is about 8:03/mile.
How can I predict my race finish time?
Multiply your pace by the race distance. At 5:00 per kilometer, a marathon (42.195 km) takes about 3:30:59. The "Calculate Time" mode does this for any distance and pace, and the pace mode shows finish times for common races at once.
What is a good running pace?
It depends entirely on fitness, age, and distance. Recreational runners often cover a 5K between 25 and 40 minutes (roughly 5:00–8:00 per kilometer). Use your own recent races as a baseline rather than comparing to a fixed number.

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