Cycling FTP (Functional Threshold Power) & Watts/kg Calculator
Calculate your Functional Threshold Power (FTP = 95% of 20-min power), power-to-weight ratio (W/kg), and Coggan zones.
Reviewed by: Dr. Ryan Callahan, CSCS, PhD • Exercise Physiology & Sports Analytics
Methodology: Verified Formula
Presets:
FTP & Power-to-Weight Ratio
252W FTP (3.40 W/kg)
Zone 2 Endurance Power Range
141W – 189W
Rider Category Benchmark
Cat 3 / Strong Club Rider
Shaving 2 kg of body weight raises your ratio to 3.50 W/kg.
Scenario Comparison & Benchmark Table (Cycling FTP & Watts/kg)
Compare how scaling 20-Minute Max Average Power (Watts) affects your output (click any row to load those values into the calculator above):
| 20-Minute Max Average Power (Watts) | FTP & Power-to-Weight Ratio | Zone 2 Endurance Power Range | Rider Category Benchmark |
|---|---|---|---|
| 133 | 126W FTP (1.71 W/kg) | 71W – 95W | Sport / Enthusiast |
| 199 | 189W FTP (2.55 W/kg) | 106W – 142W | Sport / Enthusiast |
| 265 (Baseline) | 252W FTP (3.40 W/kg) | 141W – 189W | Cat 3 / Strong Club Rider |
| 331 | 314W FTP (4.25 W/kg) | 176W – 236W | Cat 2 / Competitive Racer |
| 398 | 378W FTP (5.11 W/kg) | 212W – 284W | Cat 1 / Domestic Pro |
| 530 | 504W FTP (6.80 W/kg) | 282W – 378W | Cat 1 / Domestic Pro |
Mathematical Formula & Step-by-Step Guide
Primary mathematical equation used by this model:
FTP = 20-Min Avg Watts × 0.95; Power-to-Weight Ratio = FTP / Weight (kg)
- Configure your primary input (20-Minute Max Average Power (Watts), baseline set to 265) using either the direct numeric box or synchronized range slider.
- Adjust the remaining parameters (Cyclist Body Weight (kg)) to mirror your exact scenario.
- Examine the primary output alongside the secondary breakdown metrics and the 6-tier benchmark comparison table below.
Primary Standards & References: American College of Sports Medicine (ACSM) Metabolic Equations, International Powerlifting Federation (IPF DOTS Formula), Dr. Andrew Coggan Cycling Power Zones & Concept2 Ergometer Physics
Athletic metrics and probability calculations are for informational training and analytical use. Consult a physician before high-intensity training. 21+ Responsible Gaming.
Athletic metrics and probability calculations are for informational training and analytical use. Consult a physician before high-intensity training. 21+ Responsible Gaming.
Frequently Asked Questions — Cycling FTP & Watts/kg
What mathematical formula does the Cycling FTP (Functional Threshold Power) & Watts/kg Calculator use?
This calculator implements the verified relationship: FTP = 20-Min Avg Watts × 0.95; Power-to-Weight Ratio = FTP / Weight (kg). Each variable (20-Minute Max Average Power (Watts), Cyclist Body Weight (kg)) is evaluated in real time using double-precision floating-point arithmetic so there is zero rounding drift across multi-step scenarios.
How does changing 20-Minute Max Average Power (Watts) impact the final result?
20-Minute Max Average Power (Watts) acts as the primary driver in this model (default baseline: 265). Use the Reference Benchmark Table on this page to compare how scaling 20-Minute Max Average Power (Watts) from conservative to aggressive levels changes both the primary outcome and secondary ratios.
What standards and sources back this Cycling FTP & Watts/kg methodology?
Our model is audited by Dr. Ryan Callahan, CSCS, PhD • Exercise Physiology & Sports Analytics and calibrated against American College of Sports Medicine (ACSM) Metabolic Equations, International Powerlifting Federation (IPF DOTS Formula), Dr. Andrew Coggan Cycling Power Zones & Concept2 Ergometer Physics. Note: Athletic metrics and probability calculations are for informational training and analytical use. Consult a physician before high-intensity training. 21+ Responsible Gaming.