Even pacing is the most efficient way to run a marathon; going out too fast is the most common mistake.
How to use the Marathon Pace Calculator
- Goal time
- Race
- Want to work backwards? Type a value into Pace and Goal time is calculated for you.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Divide your goal time by 42.195 km (or 21.0975 km) to get pace, then multiply by checkpoint distances for splits.
Inputs explained
| Field | What to enter |
|---|---|
| Goal time | Units: min, h |
| Race | Choose one: Marathon (42.195 km), Half marathon (21.0975 km) |
What each result means
- Pace = [Goal time]÷[Race]
- 10 km split = [Goal time]÷[Race]×10×60
- Halfway split = [Goal time]÷2×60
- 30 km split = [Goal time]÷[Race]×30×60
Formula
Pace = goal time ÷ race distanceWorked example
Inputs — Goal time: 240 min; Race: Marathon (42.195 km).
Results — Pace = 5:41; 10 km split = 56:53; Halfway split = 2:00:00; 30 km split = 2:50:38.
Frequently asked questions
What pace is a sub-4 marathon?
About 5:41 per km (9:09 per mile).
Should I run negative splits?
Many runners aim for an even or slightly faster second half.
What formula does the Marathon Pace Calculator use?
Pace = goal time ÷ race distance.
Can I work backwards from the result?
Yes. Type the result you want into Pace and the calculator finds the matching goal time.