What is a good TSS for a training ride?

A typical endurance ride produces 50-100 TSS. Hard interval sessions are 80-150 TSS. Long sportives may be 200-400 TSS. Weekly totals of 300-600 TSS are typical for recreational cyclists training consistently.

What is Intensity Factor (IF)?

IF is the ratio of normalised power to your FTP. An IF of 1.0 means you rode at threshold. Below 0.75 is endurance, 0.75-0.90 is tempo, and above 1.05 is VO2max or above.

Is heart rate TSS accurate?

Heart rate-based TSS (hrTSS) is less accurate than power-based TSS because heart rate responds slowly to effort changes and is affected by drift, heat and fatigue. Use power data when available for more precise tracking.

How much TSS per week is safe?

Increase weekly TSS by no more than 5-10% per week. For most recreational cyclists, 300-500 TSS per week is sustainable. Elite riders may accumulate 800-1200 TSS per week during heavy training blocks.

BikeCalcs

Training Stress Calculator (TSS)

Calculate TSS from power, duration, and FTP.

Input MethodChoose your data source for TSS estimation

Duration

Total ride or workout duration in minutes

Average Power

Average power for the ride

FTP

Your current Functional Threshold Power

Normalised Power (optional)

Leave blank to use average power instead

How We Calculate This

TSS = (Duration in seconds x NP x IF) / (FTP x 3600) x 100.

Normalised Power (NP) accounts for intensity variability. Intensity Factor (IF) = NP / FTP. If only average power is available, it is used in place of NP.

Heart rate and RPE methods provide estimates using approximation formulas when power data is not available.

Frequently Asked Questions

Related Calculators

FTP Calculator

Estimate your Functional Threshold Power from test results.

Heart Rate Zone Calculator

Calculate heart rate training zones from max or threshold HR.

Power Zone Calculator

Calculate power-based training zones from your FTP.

Calorie Burn Calculator

Estimate calories burned cycling based on power, weight and duration.

TSS Calculator

Calculate Training Stress Score from power and duration.

Last updated: March 2026

All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.