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How to use
Running distance, time and pace form a three-variable relationship: any two determine the third. Choose the unknown, enter the other two and get pace per kilometer and mile, average speed and same-pace times for 5K, 10K, half marathon and marathon.
- Choose pace, finish time or distance and select km or mi for the entered distance/pace unit.
- Enter the two known quantities using hours, minutes and seconds where needed.
- Review the result, both pace units, average speed and same-pace race times.
How it is calculated
Example
Running 5 km in 25 minutes gives 5:00 per km, about 8:03 per mile and an average speed of 12 km/h. Holding exactly that pace gives a linear 10K time of 50:00.
Important notes
The race-distance times are linear same-pace projections, not performance predictions. Fatigue, terrain, weather and training change sustainable pace as distance changes. This is an informational planning tool, not medical or individualized coaching advice.
Worked examples and interpreting results
Covering 5 km in 30 minutes gives a 6-minute/km pace and 10 km/h speed. A lower pace time means faster movement.
| Case | Calculation | Result |
|---|---|---|
| Pace in minutes per km | 30 ÷ 5 | 6 min/km |
| Speed | 5 ÷ (30 ÷ 60) | 10 km/h |
How to check the result
Enter 30 minutes and zero hours/seconds. Other distance projections assume the same pace throughout; they do not predict fatigue or terrain changes.
Frequently asked questions
How is pace calculated from time and distance?
Divide total time by distance after using consistent units; 25 minutes ÷ 5 km = 5 minutes/km.
Are min/km and km/h the same thing?
No. Pace is time per distance; speed is distance per time, so they move in opposite directions.
Is the marathon time a prediction?
No. It is the theoretical time if the exact same average pace were held for 42.195 km.