Pace Calculator
Calculate your running pace and predict finish times for 5K, 10K, half marathon, and marathon.
Results
What is a Pace Calculator?
A pace calculator determines your running speed per mile or kilometer from a known distance and time. It can also project finish times for other race distances using performance prediction formulas like Riegel.
How to Use This Calculator
- Choose whether you know your distance and time, or your pace and distance.
- Enter the values in the appropriate fields.
- Select the correct units for distance and pace.
- Click Calculate to see your pace and predicted race times.
Frequently Asked Questions
What is the Riegel formula?
The Riegel formula predicts race times for different distances based on a known performance: T2 = T1 × (D2/D1)^1.06. It assumes similar training and conditions across distances.
How accurate are race predictions?
Predictions are most accurate when moving between similar distances (e.g., 10K to half marathon). Jumping from 5K to marathon involves endurance factors the formula may underestimate.
How do I convert pace from min/km to min/mi?
Multiply your min/km pace by 1.60934 to get min/mi. This calculator handles the conversion automatically when you switch units.
What is a good marathon pace?
Marathon pace is typically 15�?0 seconds per mile slower than half-marathon pace for recreational runners. Elite runners maintain paces under 5:00 per mile.