What is the Endurance Toolkit?
Endurance Toolkit is a free collection of training and racing calculators built specifically for endurance athletes. Whether you're setting heart rate zones for the first time, calculating your fuel needs for a long run, or predicting your marathon finish time, these tools give you the numbers you need - quickly and without unnecessary complexity.
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The tools are based on established endurance training principles and are designed to complement structured coaching or self-coached training plans. They're free to use, require no account, and are updated regularly as the toolkit grows.
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Endurance Toolkit is built by Steve Barbour of Barbour Performance Systems - an online endurance coaching service for runners and triathletes. If you want expert support applying these numbers to your training, explore the coaching options at stevebarbour.com.