FWAFAIR WEATHER ATHLETICS
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Free tools

Running calculators, free and sign-up free

Quick, accurate tools for planning your training and racing. Built by the team behind Trackside Training — the AI coach that turns the data you're already collecting into the training you actually need.

Race time predictor

Enter one recent race and project your 5K, 10K, half marathon, and marathon times and paces.

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Running pace calculator

Convert time to pace or pace to time for any distance, with an even-split table in miles or kilometers.

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More than a calculator.

Trackside reads the runs you're already logging from Garmin, Wahoo, and Apple Health and rebuilds your plan every two weeks — adaptive, ad-free, and free to start.

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