Running pace calculator.
Enter a distance and a time and get your pace in min/km and min/mi, your speed in km/h and mph, and predicted finish times for the 5K, 10K, half marathon, and marathon - all at the pace you just ran. Works in kilometres or miles, with one-tap race-distance presets.
calculate your pace
Quick presets
5:00 min/km
Pace
8:03 min/mi
Speed
12.0 km/h
Speed
7.5 mph
| Race | Distance | Predicted time |
|---|---|---|
| 5K | 5 km | - |
| 10K | 10 km | - |
| Half marathon | 21.0975 km | - |
| Marathon | 42.195 km | - |
Predicted times assume you hold this exact pace start to finish. Real races run slightly slower per kilometre as the distance climbs, so treat longer-race predictions as an optimistic target, not a guarantee.
the short answer
Running pace is time divided by distance. Run 10 km in 50:00 and your pace is 50 minutes / 10 km = 5:00 min/km, which is 8:03 min/mi and a speed of 12.0 km/h. Multiply that pace by a race distance to predict a finish time: at 5:00/km a marathon (42.195 km) takes 3:30:59 and a 5K takes 25:00.
What running pace is and how it is calculated.
Pace is how long it takes you to cover one unit of distance, written as minutes and seconds per kilometre or per mile. It is the single number that ties together distance, time, and speed: give the calculator any two and it solves for the third. The core maths is simple - pace = time / distance - and speed is just the inverse, distance covered per hour.
Take a 10 km run in 50:00. Pace is 50 minutes divided by 10 km, or 5:00 per kilometre. Convert to miles by multiplying by 1.60934 and you get 8:03 min/mi. Flip it for speed: 10 km in 50 minutes is 0.2 km per minute, or 12.0 km/h (7.5 mph). Every value on the result card comes from that one run.
The finish-time predictor reuses your pace against the standard race distances - 5 km, 10 km, the 21.0975 km half marathon, and the 42.195 km marathon. At 5:00/km that is a 25:00 5K and a 3:30:59 marathon. The predictor assumes an even pace, which is the honest best case; endurance and fatigue mean real races usually drift a little slower the longer they get.
Turning a pace into a week of conditioning.
Pace is how coaches set intensity. A goal-race pace anchors the hard work - threshold runs and intervals are prescribed relative to it - while easy runs sit deliberately below it to build an aerobic base. The most common mistake in endurance training is running easy days too hard, which quietly erodes recovery and blunts the quality sessions that actually drive progress.
That is why pace works best paired with effort. Pace is precise on flat, fresh, measured ground but misleads on hills, in heat, or when a runner is fatigued, so coaches cross-check it against heart rate zones to keep easy runs genuinely easy and hard days sharp. Inside coaching software a coach can set a pace target per client and program every conditioning session off it, so the whole plan scales the moment a runner gets faster.
Set pace and effort targets for every client - automatically.
This calculator is a handy one-off. Coachway lets coaches set conditioning targets per client and build the work around them inside a workout builder, with per-session logging and progress tracking - so when a runner gets faster, the next block reflects it. Clients follow the plan and log their runs in their own branded app.
Coachway is the operating system for online fitness and nutrition coaches. See how it fits your client list on the pricing page, or book a 15-minute demo.
Frequently asked questions.
How do you calculate running pace?
Running pace is time divided by distance. Run 10 km in 50:00 and your pace is 50 minutes / 10 km = 5:00 min/km. Convert to miles by multiplying by 1.60934, so 5:00 min/km is 8:03 min/mi. Speed is the inverse: 10 km in 50 minutes is 12.0 km/h. This pace calculator does all three at once.
What is a good running pace per kilometre?
It depends on the runner and the goal, so there is no single good pace. A 5:00 min/km pace gets you a 25:00 5K and a sub-3:31 marathon, which is solid for a trained recreational runner. Beginners often run easy efforts at 6:30-7:30 min/km. Use your own recent race or time-trial pace as the honest baseline.
How do I convert min/km to min/mile?
Multiply your min/km pace by 1.60934, because one mile is 1.60934 kilometres. A 5:00 min/km pace is 5.0 x 1.60934 = 8.05 minutes, which is 8:03 min/mi. To go the other way, divide your min/mile pace by 1.60934. This calculator shows both units side by side so you never have to do the maths in your head.
How does pace predict my finish time?
Multiply your pace by the race distance. At 5:00 min/km, a marathon of 42.195 km takes 42.195 x 5:00 = 3:30:59, and a 5K takes 25:00. The predictor assumes you hold an even pace, which real races rarely do, so treat the numbers as a target. Endurance and fatigue mean longer races usually run slightly slower per kilometre.
How do coaches use pace targets in training?
Coaches set pace targets to control intensity across a week. Goal-race pace drives threshold and interval work, while easy runs sit well below it to build aerobic base without digging a fatigue hole. The trap is running easy days too hard, so coaches pair pace with heart-rate zones to keep easy genuinely easy and hard days sharp.
Should I train by pace or heart rate?
Use both. Pace is precise on flat, fresh, measured ground but lies on hills, in heat, or when you are tired. Heart rate reflects true effort and self-corrects for those conditions. Set the workout target in pace, then check it against your heart rate zones so easy stays easy. The two together are far better than either alone.
Predicted finish times assume an even pace and ideal conditions, so they read as an optimistic target rather than a promise - real races drift slower as the distance climbs. This tool is general fitness information, not medical advice.
Keep building the plan: pair pace with heart rate zones so easy runs stay easy, then handle the nutrition side with the macro calculator and TDEE calculator. For programming, read our guide to software for strength and conditioning coaches.
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Open calculator ->See what Coachway can do for your coaching business
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