Running Pace Calculator
Enter any two of distance, time, and pace — get the third instantly, plus per-km and per-mile splits.
How to use the pace calculator
- Choose your unit (kilometers or miles).
- Fill in any two of the three fields: distance, time, and pace.
- Click Calculate to get the missing value and your splits.
Pace vs. speed: what's the difference?
Pace is time per unit distance (minutes per km/mile) and is how most runners think about effort. Speed is distance per unit time (km/h or mph). They describe the same thing inversely: a faster pace means a higher speed.
Using splits to race smarter
Even or negative splits — running the second half of a race as fast or faster than the first — are strongly associated with better finishing times. Use the per-km splits above to set realistic checkpoints for your goal race.
How to read your per-kilometre and per-mile splits
The split table breaks your goal into bite-sized checkpoints, one row per kilometre or mile. Rather than trying to feel whether you are 'on pace' over a whole race, you glance at your watch at each marker and compare it to the planned cumulative time.
The trick is to treat the early splits as a speed limit, not a target. If the plan says 5:00/km and you cross 1 km in 4:46, you are 14 seconds in credit but burning matches you will want later. Easing back to plan in the first 5 km is almost always the right call.
Turning a goal time into a realistic pace
Work backwards from a goal you can defend with training, not a number you wish were true. A reliable starting point is your most recent race: plug its distance and time in here, note the pace, then decide how much faster the goal pace is. If the goal demands more than about 3-5 seconds per kilometre faster than your current fitness, you usually need more weeks of training rather than more willpower on the day.
Common pace mistakes this calculator helps you avoid
The two classic errors are mixing units and ignoring the course. Setting a treadmill in miles per hour while training by minutes per kilometre leads to efforts that are wildly off; this tool converts between them so the numbers always line up. The second error is pacing a hilly or hot race the same as a flat, cool one. Use the calculated pace as your effort on neutral terrain, then allow yourself to drift slower on climbs and in heat and claw it back on descents.
Pace, speed and finish-time reference chart
| Pace /km | Pace /mi | Speed | 5K | 10K | Half | Marathon |
|---|---|---|---|---|---|---|
| 4:00 | 6:26 | 15.0 km/h | 20:00 | 40:00 | 1:24:23 | 2:48:47 |
| 4:30 | 7:15 | 13.3 km/h | 22:30 | 45:00 | 1:34:56 | 3:09:53 |
| 5:00 | 8:03 | 12.0 km/h | 25:00 | 50:00 | 1:45:29 | 3:30:59 |
| 5:30 | 8:51 | 10.9 km/h | 27:30 | 55:00 | 1:56:02 | 3:52:04 |
| 6:00 | 9:39 | 10.0 km/h | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 |
| 6:30 | 10:28 | 9.2 km/h | 32:30 | 1:05:00 | 2:17:08 | 4:34:16 |
| 7:00 | 11:16 | 8.6 km/h | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 |
Finish times assume you hold the pace evenly across the whole distance. Real races usually drift a little slower on hills and in heat, so treat these as best-case targets.
Frequently asked questions
How is running pace calculated?
Pace equals total time divided by total distance. For example, running 10 km in 50 minutes is a pace of 5:00 per kilometer (50 ÷ 10).
What is a good running pace for beginners?
Many new runners are comfortable around 7:00–8:00 per kilometer (11:15–12:50 per mile). The right pace is one where you can still hold a conversation.
How do I convert pace per mile to pace per kilometer?
Divide your per-mile pace by 1.60934. A 8:00/mi pace is about 4:58/km. This calculator switches between units automatically.
What pace do I need for a sub-25-minute 5K?
A 25:00 5K is 5:00 per kilometre (8:03 per mile). Enter 5 km and 25:00 above to confirm, and use the split table to check you reach each kilometre on or just behind 5:00.
Should I pace by my GPS watch or the course markers?
Trust the official course markers for your overall split and use GPS pace only as a live guide. GPS can over- or under-read on twisty courses and tall-building 'urban canyons', so a watch that says you are exactly on pace can still drift off the real markers.
Why is my average pace slower than my splits suggest?
Stops, walk breaks, and slowing on hills all pull your average down even if your running splits look fast. The all-in 'elapsed' pace is what determines your finish time, which is why pacing the whole effort, not just the flat sections, matters.
What running pace do I need for a 4-hour marathon?
About 5:41 per kilometre, or 9:09 per mile. The reference chart below brackets it: 5:30/km brings you home around 3:52 and 6:00/km around 4:13, so a shade under 5:45/km is your target.
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