Free tools
Useful tools for your running
Your pace, your zones, your next race. Simple tools, open methods and results you can use.
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Running pace calculator
Find pace, finish time or distance, with splits in kilometres or miles.
Heart-rate zone calculator
Compare reserve, maximum and threshold methods with the formula visible.
Running world records
Compare the distances, marks and athletes in the saved World Athletics data snapshot, with ratification status and sources.
Easy running heart rate
Estimate your easy ceiling from age and resting heart rate.
80/20 running calculator
Enter minutes in each intensity to see the balance of your week.
Four-week running template
A general easy-running template based on your established weekly volume.
Miles and kilometres converter
Convert distance, pace and speed using the exact international mile.
Road running age grading
Compare a road result with the sourced 2025 single-age standards.
Running calorie calculator
Estimate movement energy and total energy, including the effect of uphill grade.
Cooper 12-minute test
Turn a 12-minute distance into estimated VO2max and a dated reference comparison.
Treadmill pace and incline
Convert belt speed to pace and estimate the extra cost of an uphill incline.
Race time predictor
Explore equivalent race performances from one recent race result.
Training pace calculator
Find easy, marathon, threshold and interval estimates from a recent race.
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Put your numbers into a plan
A calculator gives you a starting point. I help you turn it into a week of running you can actually follow.
