How to Use Cycling Power & FTP Zone Calculator
The Cycling Power & FTP Zone Calculator takes your recent Functional Threshold Power (FTP) value and generates a detailed breakdown of your individual power training zones. These zones are crucial for targeting specific physiological adaptations during your rides, ensuring your training is efficient and aligned with your performance goals.
What It Does
Use the calculator with intent
The Cycling Power & FTP Zone Calculator takes your recent Functional Threshold Power (FTP) value and generates a detailed breakdown of your individual power training zones. These zones are crucial for targeting specific physiological adaptations during your rides, ensuring your training is efficient and aligned with your performance goals.
This calculator is for any cyclist looking to improve performance, from recreational riders to competitive racers, triathletes, and coaches. It's particularly beneficial for those who train with a power meter and want to ensure their efforts align with specific physiological goals, such as building aerobic endurance, increasing sustained power, or enhancing anaerobic capacity.
Interpreting Results
Start with W Per Kg. Then compare W Per Kg Category before deciding what changes the answer most.
Input Steps
Field by field
- 1
Ftp
If you don't know your FTP, do a 20-minute all-out effort on a steady climb or trainer and use that power. FTP = 20-min power × 0.95. Do the test fresh, not after a hard week.
- 2
Weight Kg
Read your W/kg ratio — this is the primary cross-rider comparison metric. Under 2.5 W/kg: recreational. 3.0–3.5: trained club rider. 4.0+: competitive amateur. 5.0+: elite/professional range.
- 3
Setup
Zone 2 (Endurance, 56–75% FTP) is where most training volume should live for aerobic development. Long Z2 rides at 80–90 minutes are the single most effective base-building stimulus for most cyclists.
- 4
Setup
Zone 4 (Lactate Threshold, 91–105% FTP) is your race pace and the zone where 20-minute interval work builds the most fitness per unit of training stress.
- 5
Setup
Retest FTP every 6–8 weeks during a structured training block. Fitness changes fast, and training in outdated zones reduces workout specificity.
Run one base case and one sensitivity case before trusting a single output.
Common Scenarios
Use realistic starting points
Baseline assumptions
Ftp
250
Weight Kg
75
Start with w per kg and compare it with w per kg category before changing anything.
Higher Ftp
Ftp
300
Weight Kg
75
Watch how w per kg shifts when ftp changes while the rest stays steady.
Lower Weight Kg
Ftp
250
Weight Kg
63.75
Watch how w per kg shifts when weight kg changes while the rest stays steady.
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FAQ
Questions people ask next
The short answers readers usually want after the first pass.
Sources & References
- Training and Racing with a Power Meter — Velopress (Hunter Allen & Andrew Coggan)
- Physiological and Performance Responses to a 20-Minute Time Trial in Cyclists — Journal of Strength and Conditioning Research (MacInnis MJ et al.)