Running Pace Calculator
Work out your pace per kilometer or mile from any distance and finish time, then see projected times for common race distances from 5K to the marathon. Ideal for planning training runs and pacing race-day effort.
How to Use
- Enter the distance you ran (or plan to run).
- Choose the unit for that distance — kilometers or miles.
- Enter the time in hh:mm:ss format (for example 0:25:00 for a 25-minute run).
- Read your pace per km and per mile, plus your average speed.
- Check the race projections to estimate finish times for the 5K, 10K, half marathon, and marathon at that effort.
Show Work
Race projections
About the Running Pace Calculator
Need a hand with health and fitness tracking? The Running Pace Calculator does the work for you — free, and right here in your browser. Work out your pace per kilometer or mile from any distance and finish time, then see projected times for common race distances from 5K to the marathon. Ideal for planning training runs and pacing race-day effort.
How it works
Type your numbers into the boxes. The answer shows up right away — you do not have to press a button. If you change a number, the answer changes too. So you can try different numbers and watch what happens, or check an answer you worked out yourself. Just make sure each box has the right kind of number in it.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
How is running pace calculated?
Pace is simply total time divided by distance, expressed as minutes per kilometer or per mile. For example, running 5 km in 25:00 gives a pace of 5:00 per km. This is the inverse of speed (distance over time) and is the standard way runners talk about effort because it's easy to apply to splits and target finish times.
How accurate are the race-time projections?
They are estimates based on your current pace and should be treated as a rough guide. In reality, you can't hold the same pace indefinitely — most runners slow as distance grows, typically a few percent slower each time the distance doubles. The projections assume a naive constant pace, so longer-distance predictions tend to be optimistic unless your endurance is well-developed.
What does pace per km versus per mile mean?
Both describe how long it takes to cover one unit of distance. Pace per km is common in metric countries and on the track; pace per mile is standard in the US and UK road racing. A pace of 5:00 per km is about 8:03 per mile. The calculator shows both so you can use whichever your watch, race, or training plan reports.
How should I use pace for training?
Different workouts target different paces: easy runs are run comfortably slower than race pace, tempo runs near your threshold, and intervals faster than race pace. Knowing your current race pace from a recent effort lets you set sensible targets for each type of session rather than running everything at one speed.
What's a good 5K or marathon pace?
It depends entirely on experience, age, and goals — there's no universal 'good' pace. Many recreational runners finish a 5K around 25–35 minutes and a marathon in 4–5 hours, while competitive runners are much faster. The most useful comparison is against your own previous times; use this tool to track whether your pace is improving over a training block.
How do I use the Running Pace Calculator?
Simply type your numbers and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Is it free? Does it work without internet?
Yes to both. It is free with no sign-up, and once the page has loaded it keeps working even with no internet.
Where does my data go?
Nowhere — every calculation runs on your own device. Nothing you enter is uploaded, logged, or stored.
Common Use Cases
Planning a goal-race pace
Enter your target finish time and distance to find the per-km or per-mile pace you need to hold.
Analyzing a finished run
Plug in a completed workout to see your average pace and speed.
Predicting a longer race
Use a recent 5K or 10K result to estimate a realistic half-marathon or marathon time.
Setting treadmill speed
Convert a target pace into the average speed your treadmill displays.
Comparing units
Translate between minutes-per-km and minutes-per-mile when training plans or races use different units.
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