What is Functional Threshold Power (FTP) in cycling?

FTP represents the highest average power (measured in Watts) a cyclist can sustain quasi-steadily for approximately 60 minutes. It serves as the primary benchmark for pacing and setting your individual power training zones.

What is a good Watts/kg ratio for cyclists?

Untrained cyclists typically range from 1.5 to 2.0 W/kg. Regular fitness and club cyclists average between 2.5 and 3.5 W/kg. Competitive amateur racers (Cat 1 to 3) ride between 3.8 and 5.0 W/kg, while elite and WorldTour professionals produce 5.5 to 6.5+ W/kg on decisive climbs.

How do I test my FTP?

The most common method is the 20-minute field test protocol: warm up thoroughly, complete a 5-minute all-out effort, recover for 5 minutes, ride as hard as possible for 20 minutes, and multiply average power by 0.95.

Free Power Tool · Andrew Coggan Power ZonesPower-to-Weight · Dial In Your Numbers

FTP and Watts per Kilogram Calculator

Calculate your power-to-weight ratio, category benchmark, and precision 7-zone Coggan training wattages. Need your easy-ride range? Try the Zone 2 calculator. Learn how to run an FTP test or discover turning FTP into a training plan.

Rider Telemetry Inputs

Functional Threshold Power (FTP)

Watts

Quick Set:

Rider Body Weight

Benchmark Classification

Calculated Power-to-Weight Ratio

3.33W/kg

Good (Category 4)Experienced fitness & amateur racers

UntrainedCat 4Cat 2World Class

FTP Power250 W

Rider Mass75.0 kg

Sweet Spot Range220–235 W

Coggan 7-Zone Power Targets

Calculated targets for 250W Functional Threshold Power

Zone

% of FTP

Target Range

Physiological Adaptation & Focus

Zone 1Active Recovery

< 55%

< 138 W

Easy spinning, post-race flush, zero training stress

Zone 2Endurance

56% – 75%

140 – 188 W

All-day conversational pace, fat oxidation, mitochondrial base

Zone 3Tempo

76% – 90%

190 – 225 W

Brisk pace, rhythmic breathing, aerobic efficiency

Sweet SpotSweet Spot (SS)

88% – 94%

220 – 235 W

Maximum aerobic adaptation with minimum systemic fatigue

Zone 4Lactate Threshold

91% – 105%

228 – 263 W

1-hour race pace, time-trials, raising your FTP ceiling

Zone 5VO2 Max

106% – 120%

265 – 300 W

3–8 min hard intervals, maximum oxygen uptake capacity

Zone 6Anaerobic Capacity

121% – 150%

303 – 375 W

30s–2min punchy attacks, steep hill surges, criterium breaks

Zone 7Neuromuscular Power

> 150%

> 375 W

5–15s all-out town-sign sprints, max neuromuscular recruitment

Now that you have your zones

Find your Zone 2

Your easy-riding range in watts and heart rate, plus how much of your week to spend there.

Open the Zone 2 calculator

Test your FTP properly

Guessing your FTP skews every zone. The 20-minute and ramp tests, step by step.

Read the FTP test guide

Zone 2 or sweet spot?

Which one to train when your week is short, and what the research actually says.

Read the comparison

More free tools

Heart-rate zones

Friel, Coggan or max-HR zones, for rides without a power meter.

Get your HR zones

Sweet spot calculator

88–94% of FTP, with classic workouts and their TSS.

Find your sweet spot

All free tools

TSS, W/kg chart, power zones and a FIT file viewer.

See all tools

The science of cycling power and pacing

What is Functional Threshold Power (FTP)?

Functional Threshold Power (FTP) is the highest sustained power output (in Watts) a cyclist can theoretically maintain for approximately one hour. Introduced to modern cycling by exercise physiologist Dr. Andrew Coggan, FTP serves as the universal baseline for structured training.

All structured workouts in platforms like WattsUP scale as a percentage of your FTP. Whether executing 4-minute VO2 max intervals at 115% or settling into an all-day Zone 2 endurance ride at 65%, knowing your exact FTP ensures every workout delivers the optimal training stimulus.

Why Watts/kg (Power-to-Weight) Matters

On flat roads, raw wattage (pure power) dominates aerodynamic drag. However, once the road points upward on any grade steeper than 4%, Watts per kilogram (W/kg) becomes the primary predictor of cycling speed.

A 60 kg climber producing 240 Watts operates at 4.0 W/kg, easily distancing an 85 kg rider generating 280 Watts (3.29 W/kg) on a steep mountain pass. Use our calculator above to monitor your ratio as your FTP rises and body composition adapts across the season.

How to Test Your FTP Accurately

Establish your baseline threshold using established protocols from our complete FTP guide:

The 20-Minute Field Protocol: Complete a 20-minute warm-up, ride maximal sustainable pace for 20 minutes, and multiply by 0.95.
The Ramp Test: Increase resistance by 20W every minute until failure; estimate FTP as 75% of your final minute power.
Re-testing Cadence: Retest every 6–8 weeks during build blocks, or track fitness gains via our 12-week Training Load Modeler.

Frequently Asked Questions

What is a good Watts/kg ratio for a club cyclist?+

Most recreational and club cyclists fall between 2.5 and 3.5 W/kg. Reaching 3.5 to 4.0 W/kg places you comfortably in fast group rides and competitive gran fondos. Category 1–2 racers and elite climbers typically sustain 4.5 to 5.5+ W/kg.

Should I use indoor or outdoor FTP?+

Many riders produce 5–15W less on an indoor trainer due to flywheel inertia differences and heat dissipation compared to riding outside. In WattsUP, you can use your calibrated indoor FTP for trainer workouts and let your outdoor GPX/FIT ride log reflect your real-world power numbers.

How often should I recalculate my power zones?+

We recommend recalculating your power zones whenever your FTP shifts by 5W or more, or after any dedicated 6–8 week training block. If you drop or gain body weight, updating your mass will immediately calibrate your W/kg.