FitFileLab

Running pace calculator

Enter any two of distance, time and pace — the third is calculated instantly, along with your speed in km/h and mph and your projected times over the classic race distances. Works in min/km and min/mile, entirely in your browser.

Calculate
Pace5:00 /km8:03 /mi
Time50:00
Distance10.00 km6.21 mi
Speed12.00 km/h7.46 mph

Race times at this pace

DistanceTime
1 km5:00
1 mile8:03
5 km25:00
10 km50:00
Half1:45:29
Marathon3:30:59
50 km4:10:00
100 km8:20:00

How to use the pace calculator

  1. 1

    Choose what to calculate

    Pace, finish time or distance — pick the value you're missing.

  2. 2

    Fill in the other two fields

    Pick a race distance (5K, 10K, half, marathon) or type your own, then enter your time or pace, in km or miles.

  3. 3

    Read your results

    Your pace in min/km and min/mile, speed in km/h and mph, and projected times for every classic distance appear instantly.

Frequently asked questions

How do I calculate my running pace?
Divide your time by your distance. For example, 50 minutes over 10 km is 5:00 min/km. This calculator does it instantly and also converts to min/mile, km/h and mph.
What pace do I need for a sub-4-hour marathon?
5:41 min/km, or 9:09 min/mile. For sub-3:30 you need 4:59 min/km, and sub-3:00 requires 4:16 min/km.
What's the difference between pace and speed?
Pace is time per distance (min/km or min/mile); speed is distance per time (km/h or mph). They're inverses: 5:00 min/km equals exactly 12 km/h.
Is this pace calculator free?
Yes — free, with no sign-up. Everything runs in your browser and nothing is sent to a server.

Related pace charts

Pace plan (grade adjusted) → Plan a race pace per km adjusted for the hills.