Free tools
Endurance tools that help you plan faster.
Simple calculators and planning utilities for race prep, training decisions, and workout workflows.
planning
Race Countdown
See exactly how many days and weeks you have until race day.
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Power Zones Calculator
Enter FTP and get TrainingDojo cycling power zones in watts.
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FTP Calculator
Estimate cycling FTP from 20-minute, ramp, 60-minute, or 2x8-minute tests.
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Heart Rate Zones Calculator
Calculate heart-rate training zones from LTHR or heart-rate reserve.
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Running Pace Calculator
Convert race distance and goal time into pace per mile, pace per kilometer, and splits.
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TSS Calculator
Estimate cycling or running Training Stress Score from duration and intensity.
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Power-to-Weight Calculator
Calculate watts per kilogram from cycling power and body weight.
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Intensity Factor Calculator
Calculate IF from normalized power and FTP.
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Zone 2 Calculator
Find Zone 2 targets from FTP, LTHR, or heart-rate reserve.
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FTP Rating Calculator
Calculate W/kg from FTP and body weight, then see a benchmark rating.
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Variability Index Calculator
Calculate VI from normalized power and average power.
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Critical Power Calculator
Estimate critical power and W-prime from 3-minute and 12-minute maximal efforts.
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Lactate Threshold Calculator
Estimate threshold heart rate or threshold power from field-test data.
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VO2 Max Calculator
Estimate VO2 max from running race performance or cycling power-to-weight.
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