Marathon Pace Calculator
Enter your marathon goal time to calculate the pace you need per kilometer and per mile. The calculator also shows the equivalent speed, halfway split, and a reference table for common marathon finish times.
Results update as you enter valid values.
Your inputs
Enter a distance and a time to see your pace.
Uses your current distance and target time.
These results calculate a pacing scenario from your inputs. They do not predict your fitness or guarantee that a target is achievable.
How marathon pace is calculated
Marathon pace is your total finish time divided by 42.195 kilometers or 26.2188 miles. A 4:00:00 marathon therefore works out to 5:41 per kilometer, about 9:09 per mile, and an average speed of 10.55 km/h. Those are exact arithmetic results from the target time, not a prediction of whether the goal is realistic for a particular runner.
The calculator keeps the official marathon distance fixed while you change the goal time. Use the kilometer or mile display that matches your watch, then move the result into the race split planner if you want a checkpoint table. The pace you see is an average: it does not include extra distance from weaving, manual water stops, or GPS drift.
Marathon pace chart
| Goal time | Pace / km | Pace / mile | Halfway |
|---|---|---|---|
| 3:00:00 marathon | 4:16 /km | 6:52 /mi | 1:30:00 |
| 3:30:00 marathon | 4:59 /km | 8:01 /mi | 1:45:00 |
| 4:00:00 marathon | 5:41 /km | 9:09 /mi | 2:00:00 |
| 4:30:00 marathon | 6:24 /km | 10:18 /mi | 2:15:00 |
| 5:00:00 marathon | 7:07 /km | 11:27 /mi | 2:30:00 |
These rows show average pace for the official distance. For an intermediate time or a custom race distance, use the calculator above.
How to use the marathon pace calculator
Choose a goal time, such as 3:30 or 4:00, and enter it in the time fields. The distance is already set to the official 42.195 km marathon distance. The result card shows pace per kilometer, pace per mile, speed in km/h and mph, and the time you should pass halfway if you run an even effort.
Use the table below to compare common targets. A 3:30 marathon requires 4:59 per kilometer or 8:01 per mile. A 4:30 marathon requires 6:24 per kilometer or 10:18 per mile. If your goal is between the listed rows, enter the exact time in the calculator instead of estimating from the nearest row.
What is a good marathon pace?
There is no universal “good” marathon pace because finish time depends on experience, training volume, course, weather, and the goal of the day. A practical baseline is to choose a pace that matches a recent race result or a sustained training effort, not a pace copied from somebody else. A first marathon plan is often built around finishing comfortably, while experienced runners may target a specific qualifying standard.
A useful target is one you can hold through the first 30 kilometers without gambling the final 12. If your planned pace requires a much faster effort than your long runs or recent race performances, the arithmetic is still correct but the race strategy may be too aggressive. The calculator does not replace coaching, medical advice, or a realistic assessment of your training.
How to use marathon pace on race day
Even splits are the simplest starting point: run the same average pace through halfway and repeat it in the second half. A small negative split means the second half is slightly faster than the first, while a positive split means you slow down. The best plan is usually the one you can execute without a large early surge.
Check the halfway and 5K or 10K checkpoints instead of staring at pace every second. If the course is hilly, pace by effort on climbs and use the flatter sections to return to the target. Warm weather, wind, fueling, and course congestion can all change the pace your watch reports without changing the arithmetic of your goal time.
Marathon pace in kilometers and miles
Marathon runners use both minutes per kilometer and minutes per mile. One mile is 1.609344 kilometers, so a pace per mile is always a larger number than the equivalent pace per kilometer. The calculator displays both to make a race plan readable whether the course markers are metric or imperial.
If you run on a treadmill, the speed display may be in km/h or mph rather than pace. The result card includes both speed units, so you can compare the treadmill setting with your outdoor goal. Treat the conversion as a planning aid; treadmill calibration and incline can still change the actual effort.
Frequently asked questions
What pace is a 4-hour marathon?
A 4:00:00 marathon is 5:41 per kilometer or about 9:09 per mile. The halfway split for an even race is 2:00:00.
What pace is a 3:30 marathon?
A 3:30:00 marathon is 4:59 per kilometer or about 8:01 per mile. The halfway split for an even race is 1:45:00.
Should I run even or negative marathon splits?
Even splits are the easiest default because they preserve the target average. A very small negative split can be reasonable, but a large second-half acceleration is difficult to execute after 30 kilometers.
Does this calculator include hills, heat, or stops?
No. It calculates the arithmetic pace for a goal time on an exact 42.195 km course. Hills, weather, fueling, water stops, and extra distance can make the effort different from the displayed pace.
Is a marathon exactly 42.195 kilometers?
Yes. The standard road marathon distance used here is 42.195 km, which is 26.2188 miles. This calculator uses that value for every pace result.
Why does my watch pace differ from the calculator?
Watches use GPS samples that can include small errors, curves, tunnels, or measuring differences. A watch may also display current pace rather than average pace for the whole interval.
How do I use the halfway split?
For an even race, aim to pass halfway close to the displayed split while accounting for the course and conditions. Reassess at halfway rather than forcing the second half from the start.
Can I print the marathon pace result?
Yes. After calculating a pace, use the split planner to generate a printable check table, then print the result and keep it with your race-day plan.