Aerix
Essential calculators and utilities to help you train smarter and run faster.
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Pace Calculator
Calculate pace, time, or distance for your runs.
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Race Time Predictor
Predict your marathon time based on recent races.
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Heart Rate Zones
Calculate your training zones (Max HR & Karvonen).
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Unit Converter
Convert between km/miles and pace units.
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Treadmill Calculator
Convert treadmill speed to running pace with incline adjustment.