CoachingAnswer

CAN I FIND MY FTP WITHOUT A POWER METER?

By Anthony WalshRoadman CyclingUpdated 26 May 2026

ANSWER

Yes. Without a power meter you can estimate FTP using a 20-minute heart rate test (90–95% of max HR corresponds roughly to threshold) or RPE (7–8 out of 10, the effort you could hold for about an hour). A smart trainer can also produce a power-based FTP test without a separate meter. These methods are less precise than power — expect ±10–15% accuracy — but good enough to set training zones.

KEY TAKEAWAYS

Heart rate at threshold is roughly 90–95% of your maximum — use a 20-minute sustained effort to find it.
RPE 7–8 on a 1–10 scale approximates threshold: you can speak a word or two but not a sentence.
A smart trainer (Wahoo Kickr, Tacx Neo, etc.) uses estimated power and can produce a ramp test result.
HR and RPE methods are accurate enough for zone training but not for comparing numbers week-to-week.

WHO THIS IS FOR

IS THIS YOU?

The rider who doesn't yet own a power meter

You want structured training zones but are not ready to invest in a power meter.

The rider deciding whether to buy a power meter

You want to understand what you lose without one before committing to the purchase.

THE ROADMAN VIEW

Anthony spent time in the podcast asking Uli Schoberer — the man who invented the first commercial power meter — about what cycling training looked like before power data existed. The answer is that riders found threshold by feel, by heart rate, and by the simple test of 'what can I hold for an hour?' And they got fast. Power meters are valuable but they are not the reason good training works.

If you don't have a power meter and want to train to threshold, the heart rate method is reliable enough. Find your maximum heart rate through an all-out effort (not a formula — an actual hard test). Then 90–95% of that is your approximate threshold heart rate zone. Build your 2×20 sessions around that. The limitation is that heart rate drifts with heat, fatigue, and caffeine status — so it is noisier data than power. But noise in a zone is manageable.

The honest answer on power meters is that if you are training seriously and want to track progress accurately, they are worth the investment. A decent set of pedal-based meters or a single-sided crank meter starts at around £250–350 and transforms training feedback. But don't let not having one be the reason you don't train with structure. The structure matters more than the measurement tool.

EXPERT EVIDENCE

WHAT THE EXPERTS SAY

Uli SchobererInventor of the first commercial bicycle power meter (SRM, 1986)
The purpose of a power meter is precision and objectivity — removing the noise of subjective feel from training data. But the training principles that work with a power meter also worked before it existed: threshold-based training, intensity distribution, structured intervals. The meter makes it more precise, not fundamentally different.
Hear it: The Genius Behind the First EVER Power Meter | Uli Schoberer
Joe FrielAuthor of The Cyclist's Training Bible; co-founder of TrainingPeaks
Heart rate is a valuable training metric where power is not available. Threshold HR is roughly 90–95% of maximum and can be found through a 20–30 minute sustained effort. The key limitation is heart rate lag and environmental interference — power is real-time, HR is a delayed response.
Hear it: Joe Friel's Cycling Training Plan Structure | Roadman Cycling

PRACTICAL APPLICATION

DO THIS WEEK

Run a 20-minute HR test on a steady, familiar climb or flat road
Warm up 15 minutes, then ride 20 minutes as hard as you can hold steadily. Your average heart rate over the last 15 minutes is approximately your threshold HR. Use this as the upper limit of your hard training zone.
Calibrate your RPE scale honestly
On a 1–10 scale, threshold is 7–8. At threshold you can speak one or two words, not a sentence. You're breathing hard but rhythmically. If you cannot speak at all, you are above threshold. If you can hold a conversation, you are below it.
Consider a smart trainer for a more accurate first estimate
Most modern smart trainers (Wahoo, Tacx, Kickr) can run a ramp test using estimated power. The accuracy of their power measurement varies by model but is typically ±5–10% — enough for setting training zones without a separate power meter.

COMMON MISTAKES

WHAT CYCLISTS GET WRONG

MISTAKEUsing a heart rate formula (220 minus age) to estimate max HR.
FIXPopulation formulas have huge individual variation — up to ±20 bpm. Find your real maximum HR through an actual all-out effort (uphill sprint or final lap of a group ride) before using HR for zone training.
MISTAKETrying to track FTP progress over time using HR alone.
FIXHeart rate varies too much between days and conditions to reliably track small FTP changes. HR is a useful training control tool but a poor progress-tracking tool. If you want to track improvement precisely, a power meter is worth the investment.
MISTAKEAbandoning structured training because you lack a power meter.
FIXStructure and consistency matter far more than the precision of your measurement tool. Train to HR or RPE with the same discipline you would use with power — the adaptation is the same.

FAQ

FREQUENTLY ASKED QUESTIONS

Is a smart trainer the same as a power meter for FTP testing?

Not quite. Smart trainers estimate power from resistance and speed, with accuracy varying by model and whether they are factory calibrated. Good ones (Wahoo Kickr, Tacx Neo) are typically within 1–2% accuracy. Lower-cost trainers can be ±5–10%. Compare like-for-like on the same trainer, not between a trainer and an outdoor power meter.

How accurate is RPE for threshold training without power?

Well-calibrated RPE is surprisingly accurate — experienced athletes can hold threshold within roughly 5% using feel alone. The limitation is that RPE drifts with fatigue, caffeine, heat and mental state. Consistent conditions and honest self-assessment are the requirements.

What is the cheapest way to get power data?

Single-sided crank arm meters (Stages, 4iiii) start around £200–250. Pedal meters (Garmin Rally, Favero Assioma) start around £300. On-bike trainers like a Wahoo Kickr offer power measurement without buying a separate device. The investment changes training feedback quality fundamentally.

Can I use a Garmin or Wahoo head unit to estimate FTP?

Yes, if paired with a power meter or smart trainer. Some head units also offer VO2max and FTP estimates from heart rate data alone using FirstBeat algorithms — these are rough estimates (±10–15%) but a useful baseline if you have no other option.

Does riding without a power meter actually hinder improvement?

For most beginners and recreational cyclists, no. The structure of a training plan and the discipline of consistent effort matters more than precise power data. For athletes targeting specific performance outcomes and wanting to track small gains, power measurement is genuinely valuable.

RELATED EPISODES

HEAR THE CONVERSATIONS

The Genius Behind the First EVER Power Meter | Uli Schoberer

Joe Friel's Cycling Training Plan Structure | Roadman Cycling

Heat Training for Cyclists: +30 Watts FTP | Roadman Cycling