Watshoo Tools
Simple tools for smarter running.
Free calculators for race pacing, training and shoe decisions. No login required.
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Race Pace Calculator
Turn a target finish time into pace, speed and useful race splits.
LIVERace Time Predictor
Estimate race potential and training paces from a recent result.
LIVETreadmill Pace Converter
Convert min/km to km/h, min/mile and back instantly.
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Heart Rate Zones
Build practical training zones from your heart-rate data.
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Shoe Lifespan Calculator
Estimate remaining life based on mileage and use.
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Race Fuel Calculator
Plan carbohydrate and fluid targets for race day.