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Magic Mile Calculator

Use Jeff Galloway's Magic Mile to predict race times for 5K, 10K, half marathon, and marathon.

Reviewed October 7, 2026 Runs in your browser — inputs are never stored

Magic Mile Calculator

Jeff Galloway's Magic Mile method for race prediction

5K Prediction

29:40

10K Prediction

1:04:19

Half Marathon

2:21:35

Marathon

5:06:46

This tool provides general sports and fitness estimates for educational purposes only. It is not medical advice — consult a physician before starting or intensifying training, especially if you have a cardiovascular condition.

About the Magic Mile Calculator

The Magic Mile calculator uses coach Jeff Galloway’s method of predicting race times from a timed one-mile run. Galloway’s race paces per mile are the magic mile time plus 33 seconds for a 5K, × 1.15 for a 10K, × 1.2 for a half marathon and × 1.3 for a marathon. Run the mile at a hard but controlled effort after a warm-up.

How to use it

  1. 1Run one mile as fast as you can sustain and record the time.
  2. 2Enter the time in minutes (for example 9 or 8.5).
  3. 3Read the predicted 5K, 10K, half-marathon and marathon times.

Worked example

a 9-minute magic mile predicts about 29:40 for 5K, 1:04:18 for 10K, 2:21:34 for a half marathon and 5:06:45 for a marathon.

Common use cases

  • Setting realistic race goals
  • Choosing a long-run pace
  • Tracking fitness between races

Frequently asked questions

A:A timed 1-mile test run used by coach Jeff Galloway to predict race times and calculate training paces.

Reviewed for accuracy · Last updated October 7, 2026

Formulas follow published sports-science literature and official league definitions (Karvonen heart rate reserve, Cooper and Bruce protocols, MET compendium values, and standard baseball, cricket, and basketball statistics).

CW

CalcWisee Editorial Team

Calculator development and formula review

CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.

Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards

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