Calculator
TSS
Calculator
Quantify your training load. Calculate Training Stress Score to measure the physiological cost of every ride.
Low
90
Medium
360
High
765
Very High
600
The Formula
TSS = (sec × NP × IF) / (FTP × 3600) × 100
secDuration in seconds
NPNormalized Power
IFIntensity Factor (NP/FTP)
FTPFunctional Threshold Power
Typical TSS Values
< 150
Low
Recovery complete by next day
150 - 300
Medium
Residual fatigue may persist 1-2 days
300 - 450
High
Some fatigue may last 2+ days
> 450
Very High
Residual fatigue lasting several days