Which FTP Test Should You Actually Do?
A guide for triathletes and cyclists who want real data — not a number they guessed.
I'll be honest with you. When I started cycling seriously in 2022, I didn't know what FTP meant. I didn't own a power meter. I was riding by feel — which, it turns out, meant I was going either too hard or too easy almost every single session.
Once I started training with data, everything changed. Not overnight. But session by session, I started understanding my body in a way that guessing never gave me.
FTP — Functional Threshold Power — is the foundation of that data. And the first step to using it is actually testing it properly.
Here's the honest breakdown of every major FTP test, who each one suits, and what I'd recommend based on where you are in your training.
What is FTP, and why does it matter?
FTP is the highest average power output you can sustain for approximately one hour. It's expressed in watts — or, more usefully, in watts per kilogram (W/kg).
It's not a vanity number. It's a training tool.
Every power zone you train in — from Zone 2 aerobic base to Zone 5 VO2max work — is calculated as a percentage of your FTP. Without an accurate FTP, your zones are wrong. And if your zones are wrong, your easy rides are too hard and your hard rides are too easy.
I've seen athletes training for Ironman 70.3 Westfriesland with a wildly overestimated FTP. They think they're doing Zone 2 base work. They're actually grinding at threshold every session. By race week, they're cooked.
Don't be that athlete.
The four most common FTP test protocols
1. The 20-Minute Test (Classic FTP Test)
What it is: After a structured warm-up, you ride as hard as you can sustain for 20 minutes. Your FTP is calculated at 95% of your average power for that 20 minutes.
The warm-up matters more than most people realise. A proper warm-up includes a 5-minute hard effort roughly 10 minutes before the test — this primes your neuromuscular system and gives you a more accurate result.
Who it suits: Cyclists and triathletes with some experience of pacing. You need to know how to start 20 minutes without going out too hard and blowing up at minute 12.
The problem: Pacing a 20-minute all-out effort is genuinely hard. If you go out too hard, your number is too low. If you're too conservative, it's too high. Most athletes do this test wrong the first few times.
Best for: Experienced cyclists. Athletes who've done it before and know their rough wattage. Anyone with access to a flat route or a smart trainer.
2. The Ramp Test
What it is: You start at a low power output and increase by a fixed amount every minute (typically 20 watts) until you can no longer sustain the effort. Your FTP is calculated from your peak one-minute power — usually at around 75% of that number.
Who it suits: Almost everyone — but especially beginners and newer cyclists.
Why I like it for beginners: There's no pacing strategy required. You just keep pedalling until you can't. The test does the work for you. It's also shorter in total duration — most riders hit failure within 20–25 minutes of the ramp itself.
The problem: The ramp test tends to slightly favour athletes with a high anaerobic capacity — those with more explosive muscle fibre composition. If you're a diesel engine — strong over long efforts, weaker in short bursts — the ramp test can underestimate your actual FTP by 5–10%.
Best for: Beginners. Athletes new to power-based training. Anyone who struggles with 20-minute pacing. Zwift users (the Zwift ramp test is well-implemented).
3. The 8-Minute Test (2 × 8 Protocol)
What it is: Two 8-minute all-out efforts with a 10-minute recovery between them. FTP is calculated at 90% of the average power from both efforts.
Who it suits: Athletes who find 20 minutes psychologically brutal and want a slightly shorter maximal effort — but still want more accuracy than a ramp test.
The problem: You need to manage two separate maximal efforts. The second 8-minute effort, done properly, should feel worse than the first. If it doesn't, you probably didn't go hard enough the first time.
Best for: Intermediate athletes. Triathletes who want an alternative to the 20-minute test. Good option mid-training-block when a full 20-minute test feels like too big a load.
4. The 60-Minute Test (True FTP Test)
What it is: Exactly what it sounds like. Ride as hard as you can sustain for one full hour. Your average power is your FTP — no correction factor needed.
Who it suits: Experienced cyclists and triathletes who can genuinely sustain a one-hour maximal effort.
Why it's rarely used: It's brutal. It requires elite pacing. And most athletes — even good ones — aren't mentally or physically prepared to hold true threshold for 60 minutes. The 20-minute test exists precisely because most people shouldn't attempt this.
Best for: Experienced athletes. Those whose sport requires sustained one-hour efforts (time trialists, Ironman bike-leg focused athletes). Honestly — most recreational triathletes don't need this.
So. Which one should you do?
Here's my honest recommendation based on where most of the athletes I coach actually are.
If you're new to power-based training → Ramp Test. Don't overthink it. The ramp test gets you a working number fast, with no pacing risk. Once you've been training with power for a few months and you understand how your efforts feel at different zones, revisit with a 20-minute test.
If you've done FTP tests before and know your rough wattage → 20-Minute Test. It's the industry standard. The 95% correction factor is well-validated. Done with a proper warm-up on a smart trainer or a flat outdoor segment, it gives you a highly accurate, reliable number.
If you're mid-block and need a check-in without a full test → 8-Minute Test. Lower physiological cost than a 20-minute test. Still accurate enough to recalibrate your zones. Good choice in months 2–3 of a 16-week Ironman build.
If you're an experienced cyclist who time-trials → 60-Minute Test. But you already know this. And you're probably not reading a guide like this.
A few things that will ruin your test result
Don't test on tired legs. Schedule your FTP test after a rest day or a very easy day. Testing at the end of a hard training week gives you a number that's 10–20% lower than your actual capacity.
Don't test without a warm-up. I've seen athletes go straight into a 20-minute effort cold. The first five minutes are wasted, the result is poor, and they spend the next six weeks training to a number that doesn't reflect their real fitness.
Don't skip the 5-minute primer. For the 20-minute test specifically: include a hard 5-minute effort about 10 minutes before the test starts. It primes your anaerobic system and gives you a sharper, more accurate result.
Don't test in the wrong gear (literally). On a smart trainer in ERG mode, the trainer holds the target power for you — useful for structured training, but terrible for an FTP test. Turn ERG mode off. You want to control the effort yourself.
Don't do it with the wrong mindset. An FTP test is not a race. It's information. If your number is lower than you hoped — that's useful. It means your zones were wrong, and now they're right. That's exactly what testing is for.
How often should you retest?
Every 6–8 weeks is a reasonable cadence during a structured training block. As your fitness improves, your FTP should too.
A word of caution: Don't obsess over the number. I've worked with athletes who retest every two weeks looking for improvement. They spend so much energy testing that they don't have enough left to actually train.
Test. Train to the result. Retest at the natural checkpoint in your plan.
What to do with your FTP once you have it
This is where most online guides stop. But the test is just the beginning. Once you have your FTP, you set your power zones. In TrainingPeaks (what I use with all my athletes), the standard zones look like this:
Zone 1 (Recovery): < 55% FTP
Zone 2 (Aerobic Base): 56–75% FTP — this is where most of your long rides should live
Zone 3 (Tempo): 76–90% FTP
Zone 4 (Threshold): 91–105% FTP — hard, sustainable, uncomfortable
Zone 5 (VO2max): 106–120% FTP
Zone 6 (Anaerobic): > 120% FTP
The mistake most self-coached athletes make: They spend most of their time in Zone 3. It's the grey zone. Hard enough to feel like training, not hard enough to actually adapt. Your easy rides should be genuinely easy (Zone 1–2). Your hard rides should be properly hard (Zone 4–5). The polarised approach — a concept I coach around for most of my athletes — works precisely because it avoids the grey zone trap.
One final thing
You don't need a €8,000 bike with power meter to start training with power.
A smart trainer — even an entry-level one — gives you accurate, reliable power data. If you're just getting started and you're on a budget, a smart trainer is a better first investment than an expensive bike upgrade.
And if you're not ready to invest in a smart trainer yet? Start with heart rate zones. They're less precise, but they're honest — and honest data beats no data every time.
Your next step: If you're not sure which test to do, or how to structure your training around your FTP result — that's exactly what a coaching conversation is for.
Book free consultation — 30 minutes, no pressure, just honest talk about where you are and what would actually help.
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Book a free 30-minute call — we'll talk through your goals, your schedule, and what it takes to get there.
