Running Pace Calculator
Calculate pace, predict finish times, and forecast race results using the Riegel formula.
Calculate Your Pace
Enter your distance and finish time to get your pace.
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How to Use the Running Pace Calculator
- Select your preferred unit — miles or kilometers.
- To find your pace: enter the distance you ran and your finish time. Your pace per mile/km appears instantly.
- To find a finish time: enter your distance goal and target pace. The calculator shows your projected finish time.
- Use the Race Predictor section to estimate a finish time at a different distance based on a known result, using the Riegel formula.
Common Running Paces and What They Mean
| Pace (per mile) | Level | 5K Finish Time |
|---|---|---|
| 15:00+ | Beginner walker/jogger | ~46 min+ |
| 12:00 – 15:00 | Casual runner | 37 – 46 min |
| 10:00 – 12:00 | Recreational runner | 31 – 37 min |
| 8:00 – 10:00 | Intermediate runner | 25 – 31 min |
| 6:00 – 8:00 | Advanced runner | 19 – 25 min |
| Under 6:00 | Elite / competitive | Under 19 min |
Frequently Asked Questions
How does the Riegel race predictor formula work?
The Riegel formula predicts finish time at a new distance based on a known performance: T2 = T1 × (D2 / D1)^1.06. The exponent 1.06 accounts for the fact that performance degrades slightly over longer distances — you can't maintain a 5K pace for a marathon. It was developed by Pete Riegel in 1977 and remains one of the most widely used prediction models in recreational running.
What is a good pace for a beginner runner?
A sustainable beginner pace is one where you can hold a conversation — typically 12–15 minutes per mile (7:30–9:20 per km). Speed comes with consistency. Most coaches recommend building mileage at an easy, conversational effort before focusing on pace.
How accurate is the race predictor?
The Riegel formula is most accurate when predicting across similar distances (e.g., 5K to 10K). Accuracy decreases for large jumps like 5K to marathon, where training, fueling strategy, and long-run adaptation play a bigger role than raw speed. Use it as a ballpark, not a guarantee.
What is a negative split and should I aim for one?
A negative split means running the second half of a race faster than the first. Most running coaches recommend it — starting conservatively prevents early fatigue and typically results in a faster overall time. Use the pace calculator to set a first-half target pace slightly slower than your goal pace.