Running Pace Calculator
Get your pace from a distance and time, or a finish time or distance from a pace — per km and per mile, speed, splits and 5K to marathon predictions.
Predicted finish times
- 5Keven pace 25:00 · Riegel 23:59
- 10Keven pace 50:00 · Riegel 50:00
- Halfeven pace 1:45:29 · Riegel 1:50:19
- Marathoneven pace 3:30:59 · Riegel 3:50:01
Bold is Riegel’s prediction, T₂ = T₁ × (D₂/D₁)^1.06, which allows for the slowing that a longer race brings. Grey is the pace you entered held flat over the distance.
Splits
Even splits, every 1 km
| At | Elapsed |
|---|---|
| 1 km | 5:00 |
| 2 km | 10:00 |
| 3 km | 15:00 |
| 4 km | 20:00 |
| 5 km | 25:00 |
| 6 km | 30:00 |
| 7 km | 35:00 |
| 8 km | 40:00 |
| 9 km | 45:00 |
| 10 km | 50:00 |
Training paces
From your result: race paces predicted by Riegel’s formula, placed on RunCalcs’ training zones. A starting point for a plan, not a prescription. The pace you could race for an hour sets tempo’s quicker edge.
| Zone | Pace / km | Pace / mile |
|---|---|---|
| Recovery Marathon pace + 60–90 s/km | 6:27–6:57 | 10:23–11:11 |
| Endurance Marathon pace + 30–60 s/km | 5:57–6:27 | 9:35–10:23 |
| Tempo / threshold Half-marathon pace to an hour’s race pace | 5:03–5:14 | 8:08–8:25 |
| Interval / VO₂max 3K to 5K race pace | 4:39–4:48 | 7:29–7:43 |
| Repetition 800 m race pace or faster | 4:18 or faster | 6:55 or faster |
Pace ↔ speed converter
Type any one — a pace as m:ss, or a speed such as the one a treadmill shows — and the other three follow. No distance or time needed.
Find your running pace
Enter the distance you ran (in km, miles, metres or yards) and the time it took, and see your pace per kilometre and per mile plus your speed in km/h, mph and m/s. Use the race buttons to drop in a 5K, 10K, half or full marathon distance instantly, or a track distance or the mile from the buttons before them. Switch to Finish time or Distance to go the other way: give a pace per km or per mile and get the time for a distance, or the distance covered in a time. Print, after Copy and Copy link, prints the result.
Predicted finish times
Each standard race distance gets two figures. One is your entered pace held flat — the answer to "what marathon time is this pace?". Beside it is a prediction from Riegel's formula, T₂ = T₁ × (D₂/D₁)^1.06, which allows for the slowing a longer race brings: from a 25:00 5K the flat line says a 3:30:59 marathon and Riegel says 3:59:47. Everything is calculated locally in your browser.
Frequently asked questions
How is running pace calculated?
Pace = time ÷ distance. Ten kilometres in 50 minutes is a pace of 5:00 per km (about 8:03 per mile).
Are the marathon predictions accurate?
Two numbers are shown per race. The even-pace one is exact arithmetic — your pace times the distance — and is optimistic for anything much longer than what you ran. The bold one is Riegel’s formula, the standard race predictor, which allows for that slowing; it assumes you have trained for the longer distance and is least reliable under about 3.5 minutes or over about 4 hours.
Can I switch between km and miles?
Yes, and metres and yards too. Pick the distance unit you entered; pace is always shown per km and per mile side by side.
Can it show splits for a race?
Yes. Open "Splits" for the even-pace table — the elapsed time at every kilometre, or every mile when the distance is in miles or yards — and type checkpoints, one per line as the distance reached and the elapsed time, to get each segment's own time and its pace per km and per mile.
Can it plan a negative split, convert a pace without a distance, or suggest training paces?
Yes. In “Splits”, the pace-change box — per km, or per mile for a race in miles — makes each split that many seconds faster (a negative number) or slower than the one before, while the splits still add up to your finish time; the table then gains a Pace column. The “Pace ↔ speed converter” turns any one of pace per km, pace per mile, km/h or mph into the other three with no distance or time — type the speed a treadmill shows and read off the pace. And “Training paces” lists recovery, endurance, tempo, interval and repetition paces per km and per mile, from race paces Riegel's formula predicts from your result — a starting point for a plan, not a prescription.
Can I print the result, or see my speed in metres per second?
Yes. A Print button sits after Copy and Copy link and prints the page with its result. Metres per second is shown beside the paces, km/h and mph, to two decimals.