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Pace Calculator Based on Time and Distance

Have you ever tried to finish a race under a time limit? This calculator will help you determine the average pace you should run at to reach your goal. Maybe a marathon under 3 hours? Or a 5K under 25 minutes?

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Running Race Time Predictor

This calculator will help you to predict your race time based on a previously completed race. It is based on the formula created by Peter Riegel. For details on the formula and the math read the how to guide .

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Body Mass Index Calculator

This calculator will help you to calculate your body mass index. You can use metric or imperial units.

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Pace Converter: min/km ↔ min/mile

This calculator will help you to convert between paces determined in metric and imperial units. For the details about the math behind it read the how to guide .

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Karvonen Heart Rate Zones Calculator

This calculator will help you to define your heart rate zones using the Karvonen formula. A full description of the formula can be found here .