Ramp Test vs 20-Minute FTP Test — Which One Should You Choose?
Two tests dominate FTP measurement: the classic 20-minute test and the newer ramp test. Both end with a single number, but they differ in almost everything along the way — tactics, suffering, repeatability, and which rider types they're reliable for. Here's the point-by-point comparison so you can choose deliberately.
The two protocols in short
- 20-minute test: after a solid warm-up you ride 20 minutes as hard as you can — evenly paced. FTP is 95% of the average power. Total time with warm-up: 60–75 minutes.
- Ramp test: power rises by a fixed step every minute until failure. FTP is roughly 75% of your best minute. Total time: 25–30 minutes. The full protocol is in our guide on measuring FTP with a ramp test.
Point-by-point comparison
| Ramp test | 20-minute test | |
|---|---|---|
| Total time | 25–30 min | 60–75 min |
| Tactics / pacing | none needed — resistance rises by itself | critical — a bad start ruins the test |
| Suffering | the final 2–3 minutes | the full 20 minutes |
| Experience required | none | a lot (pacing skill) |
| Repeatability | high | depends on the day and tactics |
| Fatigue afterwards | low — you can train the next day | high — easy day needed after |
| Favoured profile | anaerobic riders (overestimates) | diesels / time-trialist types |
Why pacing ruins the 20-minute test
The most common script for a failed 20-minute test: the first 5 minutes on adrenaline, 20–30 W too hard; a collapse at minute 12; the final minutes in pure survival mode. The average ends up below your real ability — and your whole training plan then runs on deflated zones. Learning proper pacing takes several attempts, and every attempt is a brutal, frustrating session.
The ramp test eliminates the problem by design: you make no pacing decisions at all. You hold your cadence, resistance climbs on its own, and the test ends when your legs do. It's hard to "ride it wrong" — which is why results are far more comparable from test to test.
But the ramp test has a weakness too
The finale of a ramp test is heavily anaerobic. A rider with a powerful sprint can drag themselves 1–2 steps past their real threshold — and walks away with an FTP inflated by 5–10%. A typical diesel cracks early and gets underestimated. How to spot your case and correct the number is covered in our article on interpreting ramp test results.
The 20-minute test behaves the opposite way: a long, even effort rewards the aerobic base. For time trialists and triathletes it's often closer to the truth — provided they can pace it.
Which one to pick? A simple rule
- You're new to power-based training → ramp test. Without pacing experience, a 20-minute test will almost certainly go wrong.
- You test regularly every 4–6 weeks → ramp test. Lower fatigue cost and better repeatability matter more than perfect calibration — the trend is what counts.
- You're a time-trialist type who knows how to pace → the 20-minute test may give you a truer number; do it 2–3 times a season on fresh legs.
- You have a big sprint and threshold intervals regularly kill you → stick with the ramp test but correct the result down by 3–5%, or verify it with a longer test.
Both tests measure the same thing indirectly. If you want to compare the methods, do both a week apart on fresh legs — the difference will tell you more about your rider profile than any article.
What matters most: one test, consistently
A bigger mistake than picking the "worse" test is mixing methods. FTP from a ramp test and FTP from a 20-minute test are slightly different numbers — switching between them destroys comparability and your fitness charts. Pick one protocol, ride it under similar conditions every 4–6 weeks, and track the trend against your power zones. Consistency, not the protocol, is what turns FTP into a useful tool.
The ramp test is built into WattLog.pro
WattLog.pro runs the ramp test on your smart trainer — FTP and power zones are calculated automatically the moment you crack.
Try WattLog.pro for free →