How to Set Zones from FTP

What FTP-based zones actually represent

Your FTP — functional threshold power — is the highest average power you can sustain for roughly an hour. That single number is useful on its own, but its real purpose is to give you a reference point for every other intensity on the bike. Training zones are just percentage bands anchored to your FTP, and each band corresponds to a different physiological demand. Zone 2 is fat-burning aerobic work; zone 4 sits right at threshold; zone 5 pushes into VO2max territory. The logic is simple: once you know your FTP, you can assign a meaningful wattage to every kind of effort you might do. If you are still fuzzy on what FTP actually measures and why it matters so much, this guide to FTP for cyclists explains the physiology cleanly before you start mapping it to zones.

The reason zones exist — rather than just riding to feel — is precision. Aerobic endurance adaptation requires hours below threshold, not long slogs just below your limit. VO2max intervals need to be genuinely hard enough to stress your aerobic ceiling, not just uncomfortable. Without zones, riders tend to drift into the grey area: too hard to be easy, too easy to be hard. That middle ground, broadly zone 3, is the training equivalent of spinning your wheels. You accumulate fatigue without a proportional return on adaptation. Zones push you out of that drift and into purposeful work.

The numbers: six zones and what they mean

The most widely used framework comes from Andrew Coggan and divides effort into six (or seven, if you include neuromuscular sprints) zones expressed as a percentage of FTP. The bands look abstract until you put real numbers behind them, so let's use an FTP of 250 W as a running example throughout. Zone 1, active recovery, sits below 55% of FTP — that's under 138 W for our example rider, and it's so easy it hardly feels like exercise. Zone 2, the endurance zone, runs from 56% to 75% — roughly 140 to 187 W — and is where the majority of your weekly volume should land. It's genuinely aerobic work: you can hold a conversation, fatigue is minimal, and you can sustain it for hours. The adaptations here are real: mitochondrial density, fat oxidation, cardiac stroke volume. It just takes patience.

Zone 3, tempo, covers 76–90% of FTP (190–225 W in our example). It feels moderately hard, breathing is elevated, and you can sustain it for 20–60 minutes. Use it sparingly — it creates fatigue without the same physiological return as zones 2 or 4. Zone 4, threshold, is 91–105% of FTP (227–262 W). This is the zone most associated with FTP training itself: sustained efforts of 10–30 minutes that push lactate clearance to its limit. Zone 5, VO2max, runs from 106–120% (265–300 W) and is where short, punishing intervals like 5×5-minute blocks or 30/30s live. Zone 6, anaerobic capacity, starts above 120% (above 300 W) — efforts short enough that the aerobic system barely has time to contribute meaningfully. For the full picture of how these zones fit into a structured training approach, LeCoach's cycling training zones overview walks through the broader framework and how each zone builds on the others.

Setting up your zones: a practical walkthrough

The mechanics are simple. Take your FTP and multiply it by the lower and upper percentage for each zone. If your FTP is 250 W, zone 4 is 250 × 0.91 = 228 W at the bottom and 250 × 1.05 = 262 W at the top. Do that for each zone and you have a complete set of wattage targets. Most head units and training platforms will do this automatically once you enter your FTP — Garmin, Wahoo, TrainerRoad, and others all have built-in zone calculators. Enter your FTP, select the Coggan model (or whichever model your coach uses), and the device handles the maths. The only thing you need to supply is an accurate FTP number.

Here's where many riders stumble: they use an FTP that's either outdated or inflated. An FTP from eight months ago will produce zones that no longer match your current fitness. An FTP from a test you blew up partway through will produce zones that are too easy across the board — your zone 4 becomes zone 3 in practice, and you never actually train at threshold. The zones are only as good as the number behind them. Test regularly — every six to eight weeks is a reasonable cadence during a training block — and update your zones immediately after each test. That's what keeps your training prescription accurate. If you want to avoid the full re-test between test cycles, here are practical ways to adjust your training targets without a formal retest.

Where zone training goes wrong

Let's be direct about something most riders do wrong: they ride by the top end of the zone. Zone 2 says 56–75% of FTP, so they ride at 73%. That's technically zone 2, but barely. Over a three-hour ride, they're accumulating far more physiological stress than intended, the recovery cost increases, and the next day's quality session suffers. The smarter approach is to aim at the middle of the zone — or even the lower end for long aerobic work — and let the effort be easier than feels productive. The adaptations from zone 2 require volume and consistency, not intensity creep. This is the single most common mistake in self-coached training, and it's the reason so many riders plateau despite training hours that look solid on paper.

The second mistake is treating zone labels as vague intentions rather than hard targets. Saying "I did a zone 4 session" without actually checking your power data means nothing. Threshold is threshold — it should hurt, it should be sustained, and your average power for the interval should sit between 91% and 105% of FTP, not wherever your legs happened to land. Use your power meter or smart trainer as a hard constraint, not a reference. If you're consistently underperforming your zone 4 target in the final third of an interval, that's useful feedback: either your FTP is slightly high, your fatigue is too great, or your pacing is too aggressive at the start. All of these are fixable, but only once you're looking at the numbers clearly. If you're unsure whether your FTP benchmark is actually accurate, this piece on what FTP really means to cyclists will help you interpret your number honestly. Finally, remember that the zone percentages are a starting point, not gospel — some riders find their lactate threshold sits closer to 100% of FTP, others at 95%, and adjusting your zone 4 ceiling slightly after a few structured sessions is entirely reasonable.