Running pace calculator
Enter a distance and a finish time to get pace per kilometre and per mile, speed, splits, and what the same pace would give over other distances.
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Result
These are estimates from population-level equations, not a measurement of you and not medical advice. Individual results vary widely. Talk to a doctor or a registered dietitian before making significant changes to how you eat or train.
How this is calculated
Pace, speed and timedefault
pace per km = time / distance (km)
pace per mile = time / distance (miles)
speed (km/h) = distance (km) / time (hours)
finish time = distance (km) × pace per km
- Source
- Arithmetic. Race distances are the official ones; marathon (42,195 m) and half marathon (21,097.5 m) are fixed by World Athletics Competition Rule 55.
- Assumes
- A constant pace across the distance.
- Accuracy
- Exact by definition — pace is distance over time. Everything is computed in metres and seconds and converted once at the end, so no rounding accumulates down a splits table.
Finish times by pace
Read down from your pace per kilometre to a finish time at each distance. These assume the pace holds, which it generally does not: pace falls as distance rises.
| Pace per km | 5k | 10k | Half | Marathon |
|---|---|---|---|---|
| 4:00 | 20:00 | 40:00 | 1:24:23 | 2:48:47 |
| 4:30 | 22:30 | 45:00 | 1:34:56 | 3:09:53 |
| 5:00 | 25:00 | 50:00 | 1:45:29 | 3:30:59 |
| 5:30 | 27:30 | 55:00 | 1:56:02 | 3:52:04 |
| 6:00 | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 |
| 6:30 | 32:30 | 1:05:00 | 2:17:08 | 4:34:16 |
| 7:00 | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 |
Questions
- How do I enter a time?
- As h:mm:ss or m:ss — 25:30 for twenty-five and a half minutes, 1:45:00 for an hour and three quarters. A bare number is read as seconds. Malformed entries like 1:75 are rejected rather than silently read as 135 seconds.
- Are the projections to other distances reliable?
- No, and the page says so. They assume the same pace holds over a different distance, which it does not: pace falls as distance rises. They are a like-for-like comparison, not a race prediction. Riegel’s formula exists for actual prediction and applies a fatigue exponent.
- Why is the last marathon split shorter?
- Because a marathon is 42.195 km, so after 42 full kilometre splits there is 195 m left. That segment is shown and flagged as partial rather than dropped — a splits table that quietly omits the last 195 m of a marathon is wrong exactly where it matters most.
- What is a good 5k time?
- This site does not publish "good" times, because the answer depends entirely on age, training history and purpose. The pace chart lets you compare your own times across distances, which is the useful comparison.
- Does this work for walking?
- Yes. Pace is distance over time regardless of how you cover it. Walking paces typically fall between 9 and 15 minutes per kilometre, which is within the range of the chart.