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Free tools

Tools

Free calculators built around the science. Enter your numbers, get precise zones and targets.

2 tools

Z2
Zone 2 Calculator

Enter your age and resting heart rate. Get your exact Zone 2 range and all five training zones using the Karvonen formula. Know precisely where every run should land.

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PC
Pace Converter

Fill in any one value and all others update instantly. Convert between min/km, min/mile, and km/h. See projected finish times for 5K, 10K, half marathon, marathon, and 400m lap.

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The app

Your zones are
just the start.

The calculators give you the numbers. The app tells you exactly what to do with them, week by week. Free account to see your plan.

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Next steps

Keep moving.

Pick the next useful step. Build your plan, choose a distance, check the membership, or keep reading the method.

App path Build your plan → Answer three questions and preview the training week before any card. Pick a goal Training Plans → Choose 5K, 10K, half marathon, or marathon and see how the method applies. Membership Pricing → One membership: adaptive plan, method-based coach, community, and guides. Learn the method Guides → Read the free science-backed guides behind the Run Mastery system.