1. What is the 5K to Half Marathon Pace Conversion?

The 5K to half marathon pace conversion estimates your sustainable pace for a half marathon (21.0975 km) based on your current 5K (5 km) pace. This accounts for the increased endurance needed for longer distances.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Pace_{5k} \) — Your current 5K pace in minutes per mile
• 21.0975 — Half marathon distance in kilometers
• 5 — 5K distance in kilometers
• \( factor \) — Adjustment factor (typically 1.03-1.07)

Explanation: The factor accounts for the fact that you can't maintain your 5K pace for a half marathon. A higher factor means a greater slowdown for the longer distance.

3. Importance of Pace Conversion

Details: Converting your 5K pace helps establish realistic half marathon goals and training paces. It prevents starting too fast and helps with race strategy.

4. Using the Calculator

Tips: Enter your current 5K pace in minutes and seconds per mile. The default factor of 1.06 works for most runners, but adjust based on your endurance:

• 1.03-1.05: For experienced long-distance runners
• 1.06-1.07: For runners new to longer distances

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this conversion?
A: It provides a good estimate but individual results vary based on endurance, training, and race conditions.

Q2: Should I use my PR or current 5K pace?
A: Use your current fitness level. If you haven't raced recently, use a recent training pace.

Q3: How does terrain affect the conversion?
A: This assumes flat courses. Add 2-4% to the factor for hilly races.

Q4: Can I use this for marathon pacing?
A: No, marathon pacing requires a different conversion factor (typically 1.10-1.15).

Q5: How should I adjust for weather conditions?
A: Add 1-2% to the factor for hot/humid conditions or high-altitude races.