Running Calculators
Pace, speed, race time, and splits. Start with the pace calculator for any distance, or open a race page when you want finish time and checkpoints for a 5K, 10K, half marathon, or marathon.
Pace
The general pace calculator covers any distance. The race pages lock the course length and add even splits.
Pace Calculator
Solve for running pace, finish time, or distance, and see speed in km/h and mph.
Marathon Pace Calculator
Pace, speed, and 5K checkpoints for 42.195 km.
Half Marathon Pace Calculator
Pace and 5K checkpoints for 21.0975 km.
5K Pace Calculator
Finish time, min/km, min/mile, and kilometer splits for 5 km.
10K Pace Calculator
Finish time, pace, and kilometer splits for 10 km.
Race times
Project a different distance from a race you have already run. Then open the matching pace page for splits.
Speed
Pace is time per distance. Speed is distance per time. These two pages convert between them.
Splits
Checkpoint times for an even effort. Pick the marker interval the course actually uses.
Conversions
Use this when a plan is written in the other unit and you do not need a finish time.
Guides
- How to calculate running pace
The division, finish time from a pace, and a worked 5K.
- What is a good running pace?
Why “good” depends on distance and effort.
- Running pace vs speed
When to use min/km and when to use km/h.
- Average running pace by age and distance
Wide race-time bands for 5K, 10K, half, and marathon.
- Average running speed by age
Easy-run planning ranges, separate from race pace.
- 5K pace chart
Finish times from 20:00 to 40:00.
- 10K pace chart
Finish times from 40:00 to 1:10, plus the halfway split.
- Cut 5 minutes off a 10K
Always 30 seconds per kilometer, or about 48 seconds per mile.
- How long does a half marathon take?
Times for 21.0975 km.
- Average half marathon times by age
Planning ranges and the pace at each end.
- Marathon pace chart
Finish times from 2:30 to 6:00.
- Average marathon times by age
Coaching bands, not race medians.
- How to run a sub-4 hour marathon
5:41/km, the checkpoints, and what a shorter race implies.
- Minutes per mile to minutes per kilometer
The conversion chart and the mistakes it prevents.