Calculate personalized cycling power and heart rate training zones. Set zones from FTP or max HR for structured training programs.
Training zones are the foundation of structured cycling training. They define intensity levels that target specific physiological adaptations — from easy recovery spinning that promotes blood flow, to all-out anaerobic efforts that build peak power. Without clearly defined zones, athletes tend to train too hard on easy days and too easy on hard days, a pattern known as "moderate intensity rut" that limits performance gains.
Modern zone-based training uses either power (in watts) or heart rate to define intensity ranges. Power zones, typically based on Functional Threshold Power (FTP), provide the most precise and responsive measurement. Heart rate zones offer a more accessible alternative for riders without power meters. Many coaches use both simultaneously, with power dictating the target effort and heart rate providing additional context about physiological state.
This calculator generates complete training zone charts for both power and heart rate, configurable across multiple popular zone models. It includes workout suggestions for each zone, recommended weekly training distribution, and a race-day pacing guide.
Precisely defined training zones ensure every workout has a purpose. This calculator gives you personalized zones for both power and heart rate, plus practical workout suggestions, so you can train smarter and improve faster. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain. Use this clarification to avoid ambiguous interpretation.
Coggan Power Zones: Z1 <55% FTP, Z2 55-75%, Z3 76-90%, Z4 91-105%, Z5 106-120%, Z6 121-150%, Z7 >150%. Heart Rate Zones (Karvonen): Zone HR = Resting HR + (Zone% × HR Reserve). HR Reserve = Max HR - Resting HR.
Result: Z4 (Threshold): 228-263 W / 166-177 bpm
With an FTP of 250W, Zone 4 (Lactate Threshold) ranges from 91-105% FTP = 228 to 263 watts. The corresponding heart rate zone using Karvonen method spans 166-177 bpm. Your FTP is 3.47 W/kg — a strong competitive amateur level.
Power and heart rate measure different aspects of performance. Power quantifies external mechanical work — it's immediate, objective, and unaffected by environmental conditions (heat, altitude) or day-to-day variability. Heart rate measures internal physiological strain — it reflects how hard your body is working but responds with a 30-60 second lag and drifts upward during sustained efforts. The sweet spot in coaching is using power to control workout intensity and heart rate to monitor physiological response and detect fatigue or overreaching.
Each training zone serves a specific purpose. Zone 2 rides (55-75% FTP, 2-5 hours) build mitochondrial density and fat oxidation. Sweet spot intervals (88-93% FTP, 2×20 min) efficiently raise threshold. VO2max intervals (106-120% FTP, 5×4 min) increase maximum oxygen uptake. Anaerobic capacity work (121-150% FTP, 8×1 min) develops the ability to sustain efforts above threshold. A well-designed training plan distributes volume across zones to create progressive, specific, and sustainable training stress.
Training periodization shifts the zone emphasis across a season. Base phase prioritizes Zone 2 volume (80-90% of total hours). Build phase increases Zone 4-5 intensity while maintaining Zone 2 base. Peak phase adds Zone 6-7 specificity for target events. Recovery weeks reduce volume by 30-40% while maintaining some intensity to retain sharpness. This systematic approach ensures continuous adaptation without burnout or plateau.
Coggan 7-zone is the most widely used for power-based training. The Friel 5-zone model simplifies things for heart rate training. Polarized 3-zone works well for athletes who struggle with too many intensity buckets.
Retest FTP every 6-8 weeks during a training block, or whenever you feel your zones no longer match perceived effort. Fitness changes can shift FTP by 5-15 watts in a single training block.
FTP is often 5-10% lower indoors due to heat buildup and reduced inertia. Many athletes use separate indoor and outdoor FTP values. Heart rate zones typically don't need adjustment.
The 80/20 rule is well-supported by research: ~80% of training volume at low intensity (Z1-Z2), ~20% at high intensity (Z4+). Minimize time in Z3 (tempo) as it creates moderate fatigue without strong adaptation stimulus.
Heart rate responds to many factors beyond power: heat, dehydration, caffeine, fatigue, stress, and cardiac drift. Power zones take priority for workout execution; heart rate provides supplementary information.
Sweet spot is 88-93% FTP — high enough to stimulate adaptation but sustainable for longer intervals (2×20 min). Threshold (95-105% FTP) provides a larger stimulus but requires shorter intervals with more recovery.