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Race Time Predictor

Race Time Predictor

Predict your future race times based on your previous performances using Riegel's formula. Enter your recent race time and distance, then select your target race distance to get an estimated finish time, pace, and speed. This tool helps runners set realistic goals and plan their race strategy for upcoming events.

Recent Race
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Enter a recent race time that reflects your current fitness level. For best results, use a race completed within the last few months.
Target Race
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Select the distance of your upcoming race. The predictor works best for similar types of races (e.g., road to road, trail to trail).
Kilometers Miles
Predicted Results
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This prediction uses Riegel's formula: T2 = T1 × (D2/D1)^1.06, where T1 is your recent race time, D1 is your recent race distance, D2 is your target race distance, and T2 is your predicted time.
Predicted Finish Time: --:--:--
Predicted Pace (min/km): --:--
Predicted Speed (km/h): --

Race Time Predictor Guide

What is Riegel's Formula? This mathematical formula (T₂ = T₁ × (D₂/D₁)^1.06) accounts for the fact that running speed decreases exponentially with distance, not linearly. The 1.06 exponent represents the fatigue factor that increases with longer distances.

How to Get Accurate Predictions

  • Use recent race times (within 2-3 months) that reflect your current fitness
  • Choose similar race types (road to road, trail to trail)
  • Avoid extreme distance differences (e.g., 5K to marathon)
  • Consider race conditions and course difficulty
Important: Predictions are estimates based on mathematical models. Your actual performance may vary due to training, race conditions, health, and other factors.

Essential Running Gear for Optimal Performance

While our race time predictor helps you set realistic goals, having the right gear can help you achieve those predictions. Here are some essential items that can enhance your running performance:

Recommended Running Gear

Running Shoes

Quality running shoes provide proper support, cushioning, and energy return.

Shop Running Shoes
GPS Watch

Track your pace, distance, and heart rate in real-time to ensure you're hitting your predicted race pace.

Shop GPS Watches
Performance Apparel

Moisture-wicking, breathable clothing that keeps you comfortable and focused on your race goals.

Shop Running Apparel

Featured Product: Puma Velocity Nitro 3

For runners looking to optimize their performance, the Puma Velocity Nitro 3 offers NITRO™ foam midsole for responsive cushioning, breathable mesh upper, and PUMAGRIP™ outsole for reliable traction. Read our detailed review of the Puma Velocity Nitro 3 to learn more about how this shoe can enhance your running experience.

Pro Tip: Use multiple recent race times to get a range of predictions. This gives you a more realistic window of expected performance rather than a single target time.
Disclosure: This page contains affiliate links. We may earn a commission from qualifying purchases at no additional cost to you. This helps support our free tools and content.

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