Pace Calculator
Solve for pace, time or distance and get split times for common race distances.
About Pace Calculator
Pace, time and distance form a simple triangle of relationships — knowing any two gives you the third. This calculator solves all three directions and extends the result to a split table for common race distances. The split table lets runners verify even-pacing strategy or set milestone targets for marathon training.
Formulas
Pace
Pace = Total Time ÷ Distance
- p
- Pace (seconds per km or mile)
- T
- Total time in seconds
- D
- Distance in km or miles
Finish time
Finish Time = Pace × Distance
Distance
Distance = Total Time ÷ Pace
Worked example
With the default values below, Pace Calculator returns Pace (per km) of 05:00. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Solve Forone of Pace (given distance + time), Finish Time (given distance + pace), Distance (given pace + time)
- Pace (given distance + time)
- Distance Unitone of Kilometres, Miles
- Kilometres
- Distance (km)accepts 0.1–1,000 km
- 10 km
- Distance (miles)accepts 0.06–621 mi
- 6.21 mi
- Finish Time
- 0:50:00
- Pace (min/km)
- 5:00
- Pace (min/mile)
- 8:03
Results
- Pace (per km)
- 05:00
- Pace (per mile)
- 08:02
- Speed
- 12.00 km/h
Step by step
- 1Total time= 50:00
- 2Distance= 10 km
- 3Pace per km= 05:00 /km
Assumptions and limits
- The result is derived only from the 7 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- Pace calculations are mathematical and assume constant effort throughout the distance. Real-world performance varies with terrain, weather, fatigue and pacing strategy. Use finish time predictions as a guide, not a guarantee.
- This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Pace calculations are mathematical and assume constant effort throughout the distance. Real-world performance varies with terrain, weather, fatigue and pacing strategy. Use finish time predictions as a guide, not a guarantee.
Frequently Asked Questions
What does 'pace' mean in running?
Pace is the time taken to cover one unit of distance (typically one kilometre or one mile). A pace of 5:00 /km means you cover one kilometre every five minutes. It's the inverse of speed — faster running = lower pace number.
How do I run a sub-4-hour marathon?
You need a pace of 5:41 /km (9:09 /mile). Input a 42.195 km distance with a target time of 3:59:59. The calculator will show the required pace and confirm whether it's achievable based on your current training paces.
Should I use km or miles?
Use whichever matches your GPS watch and race. Most road races outside the US use kilometres. The calculator always shows both pace formats — you can use one as a cross-check regardless of which unit you entered.