RPE to TSS — Foster session-RPE calculator

Convert duration + perceived effort (RPE 1-10) into estimated TSS using the Foster session-RPE formula. Useful for sessions without GPS/HR (gym, yoga, treadmill, manual workouts).

Duracion (min) RPE (1-10)

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Foster sRPE is the validated method for sessions without sensors. Calibration tip: train your RPE by scoring after each session and compare to TSS from HR/power. After 10-20 sessions your RPE is reliable.