How to Estimate Your FTP Without a Lab Test

What Is FTP?

Functional Threshold Power (FTP) is the highest average power you can sustain for approximately one hour. It represents your lactate threshold — the intensity above which fatigue accumulates rapidly.

FTP is the gold standard metric in cycling for setting training zones, tracking fitness, and pacing races. Knowing your FTP means every ride has purpose.

3 Methods to Estimate Your FTP Without a Lab

You don't need a sports science lab to find your FTP. Here are three proven field tests:

Method 1: The 20-Minute Test

The most popular method, developed by Hunter Allen and Andrew Coggan.

1. Warm up for 20 minutes (including some hard efforts)
2. Ride as hard as you can sustain for 20 minutes
3. Take your average power and multiply by 0.95

FTP = 20-min average power × 0.95

Example: If your 20-minute average is 280W, your FTP is 280 × 0.95 = 266W

This works because most riders can sustain about 5% more power for 20 minutes than for a full hour.

Method 2: The Ramp Test

Easier to execute, popular on platforms like Zwift and TrainerRoad.

1. Start at a low wattage (~100W)
2. Increase by 20W every minute
3. Ride until you can't hold the target power
4. Take 75% of your best 1-minute power

FTP = last completed minute average × 0.75

Pros: Shorter, less mentally demanding. Cons: Can underestimate FTP for diesel-type riders.

Method 3: The 2×8-Minute Test

Good for beginners who struggle to pace a 20-minute effort.

1. Warm up for 15 minutes
2. Ride hard for 8 minutes, rest 10 minutes
3. Ride hard for 8 minutes again
4. Average the two 8-minute powers, multiply by 0.90

FTP = average of two 8-min efforts × 0.90

Which Test Should You Choose?

| Test | Duration | Difficulty | Best For | |------|----------|-----------|----------| | 20-min | ~45 min total | Hard | Experienced cyclists | | Ramp | ~25 min total | Moderate | Smart trainer users | | 2×8-min | ~45 min total | Moderate | Beginners |

What to Do With Your FTP

Once you know your FTP, you can:

• Set your 7 power zones using the Coggan model — use our Power Zones Calculator
• Track fitness over time — retest every 6–8 weeks
• Pace races — know exactly what wattage to target
• Structure training — Sweet Spot, threshold intervals, VO2max work all depend on FTP

Ready to calculate? Use our FTP Calculator to estimate your FTP from any of these test protocols.

Tips for an Accurate Test

1. Be rested — test after 1–2 easy days
2. Same conditions — indoor tests are more consistent than outdoor
3. Proper warm-up — 15–20 min with some openers
4. Pace yourself — start conservative, finish strong
5. Calibrate your power meter — do this before every test

References

• Allen H, Coggan A (2010). Training and Racing with a Power Meter (2nd ed.). VeloPress.
• Borszcz FK et al. (2018). Functional Threshold Power in Cyclists: Validity of the Concept and Physiological Responses. Int J Sports Med, 39(10):737-742.