Pace Calculator
Calculate your running pace, predicted finish time, or distance covered. Get pace in both km and mile units, speed in km/h and mph, plus finish time predictions for common race distances.
- Start slower and build up pace for longer races
- Your 10K pace is typically 15-20 seconds slower than 5K pace
- Negative splits (faster second half) often lead to better finish times
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How to Use
- 1 Select calculation mode — Choose what you want to calculate: Pace (from distance and time), Time (from distance and pace), or Distance (from pace and time).
- 2 Enter your values — Input the known values. Use quick select buttons for common race distances (5K, 10K, Half Marathon, Marathon).
- 3 Toggle units — Switch between kilometers and miles for distance, and min/km or min/mi for pace.
- 4 View results and splits — See your calculated result plus pace/speed in all units. Check the splits table for predicted finish times at various distances.
Frequently Asked Questions
What's a good running pace?
It varies by fitness level. Beginners often run 7-8 min/km (11-13 min/mi). Intermediate runners average 5-6 min/km (8-10 min/mi). Elite marathoners run around 3 min/km (4:50 min/mi).
How do I calculate my race finish time?
Enter your target distance and current training pace. The calculator will show your predicted finish time. Use slightly slower pace for longer races as fatigue increases.
What's the difference between pace and speed?
Pace is time per distance (e.g., 5:30 min/km) - how long to cover a unit distance. Speed is distance per time (e.g., 10.9 km/h) - how much distance in a unit time. They're inversely related.
Are the race splits accurate?
Splits assume you maintain constant pace throughout. In reality, most runners slow down in longer races. Add 5-10% for half marathons and 10-20% for full marathons compared to your 5K/10K pace.