1. What is the Race Equivalent Calculator?

The Race Equivalent Calculator estimates equivalent race times for different distances using the Riegel formula. It helps runners predict their performance at one distance based on results from another distance.

2. How Does the Calculator Work?

The calculator uses the Riegel formula:

Where:

• \( T1 \) — Original race time (minutes)
• \( D1 \) — Original race distance (km)
• \( D2 \) — New race distance (km)
• \( T2 \) — Predicted time for new distance (minutes)

Explanation: The exponent 1.06 accounts for the fact that running speed decreases slightly more than linearly as distance increases.

3. Importance of Race Time Prediction

Details: Accurate race time prediction helps runners set appropriate pace goals, plan training, and compare performances across different distances.

4. Using the Calculator

Tips: Enter your original race time in minutes, original distance in km, and new distance in km. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this formula?
A: It works best for distances between 5km and marathon. Accuracy decreases for very short sprints or ultra distances.

Q2: Does it account for different fitness levels?
A: No, it assumes similar fitness between races. Recent race times give best predictions.

Q3: Why the 1.06 exponent?
A: Research shows this value best matches real-world performance degradation over distance.

Q4: Can I use it for other sports?
A: The formula works best for running. Other sports may need different exponents.

Q5: How should I interpret the results?
A: Treat as a guideline. Actual performance depends on course, weather, training specificity.