Pace calculator
This running pace calculator solves for pace, time or distance from whichever two you already know, converting between min/km, min/mi, km/h and mph in one place. Pick what to solve for, enter your two known values, and read off the missing number plus a full table of what that pace means over 5K, 10K, half marathon and marathon distances, making it easy to sanity-check a workout plan or race goal in seconds.
Pace
5:00min/km
Time at this pace
| Race | Time |
|---|---|
| 5K | 25:00 |
| 10K | 50:00 |
| Half marathon | 1:45:29 |
| Marathon | 3:30:59 |
How it works
Pace, time and distance are locked together by one relationship: time equals distance divided by speed. The calculator rearranges that relationship depending on which value you're solving for, so entering distance and time gives pace, distance and pace give time, and time and pace give distance.
Every pace is stored internally in seconds per kilometre and converted to seconds per mile, kilometres per hour or miles per hour only for display, so switching units never changes the underlying number, only how it's shown.
The table below applies your solved pace to four common race distances, which is a quick way to sanity-check a goal pace against the finishing time it implies for a race you're actually training for.
Frequently asked questions
How do I calculate my running pace?
Divide your total time by your distance: a 30-minute 5K is 6 minutes per kilometre. This calculator does that division for you and also converts the result to min/mi, km/h and mph at once, so you don't need a separate lookup for each unit.
What pace do I need to run a marathon in 4 hours?
Set the solver to pace, enter the marathon distance and a 4:00:00 time, and the calculator returns roughly 5:41 per kilometre, or about 9:09 per mile. The table also shows what that same pace produces over 5K, 10K and half marathon.
Why does my pace change slightly when I switch to miles?
It doesn't change, only the display does. A pace stored as seconds per kilometre becomes a larger number of seconds when shown per mile, since a mile is longer than a kilometre, but it represents the exact same running speed either way.
Related tools
- Pace converterConvert running speed between km/h, mph, min/km and min/mi instantly, free, with a reference table spanning 6 to 22 km/h for quick lookup.
- Race time predictorPredict your 5K, 10K, half and marathon time from a recent race using the Riegel formula, free, the same model the Overload app uses.
- VDOT calculatorCalculate your Daniels VDOT, VMA and VO2max from a race result, free, with training pace zones the same way the Overload app computes them.
- Heart rate zones calculatorWork out your five running heart rate zones from age or a known HRmax, free, with the Karvonen method for a more personal result.
Overload keeps your running bests per distance
Log a run and Overload automatically tracks your best pace and time for every distance you cover, no manual calculation needed. Free on iOS and Android.