Bike performance planning

FTP Calculator

Estimate bike FTP, clean up your power zones, and turn the result into triathlon pacing targets that respect the run.

Quick Presets

Test Protocol

Most practical standard field test for trained age-groupers.

Test Data

Enter the raw test numbers from your platform or power file.

20-Minute Average Power

watts

Enter your full 20-minute average power, not an already estimated FTP from Zwift or TrainerRoad.

Body Weight

kilograms

Reference Table

Used only for the W/kg context bands shown below.

Bike FTP Summary

20-min Test (FTP = 95%) result translated into practical training and race-day anchors for self-coached triathletes.

FTP

238W

Rounded display value from a calculated FTP of 237.5W.

W/kg

3.39

Power-to-weight for comparing bike strength inside your reference band.

Performance Band

Recreational

Consistent age-group or recreational athlete

Sweet Spot

209-224W

88-94% FTP

FTP is most useful here as a coaching anchor, not as a promise that every threshold marker or race-day power target will line up perfectly.

Triathlon Race Pacing Targets

Starting ranges for self-coached age-groupers. Use them as planning anchors, then sanity-check them against your run durability.

Sprint

219-238W

92-100% FTP

Short-course range for strong bike execution while keeping enough snap for the run.

Olympic

202-219W

85-92% FTP

A starting range for age-group pacing that still respects run durability.

70.3

186-202W

78-85% FTP

Best used with fueling, terrain, and heat in mind. Avoid chasing the top end too early.

Ironman

162-179W

68-75% FTP

Long-course pacing should protect the run and your fueling strategy above all else.

Before you lock these in

• Course profile and total climbing

• Heat, wind, and indoor-vs-outdoor context

• Fueling and hydration execution

• Run durability and current training load

• Experience pacing long steady efforts

Coggan 7-Zone Power Targets

Z1Active Recovery

0-131 W

0-55% FTP · Recovery, warm-up, cool-down

Z2Endurance

132-179 W

56-75% FTP · Aerobic base, steady endurance, durability

Z3Tempo

180-214 W

76-90% FTP · Muscular endurance and sustainable race pressure

Z4Threshold

215-250 W

91-105% FTP · Raise sustainable power and race-specific fitness

Z5VO2max

251-286 W

106-120% FTP · Aerobic capacity and high-end power

Z6Anaerobic

287-357 W

121-150% FTP · Anaerobic capacity and punch

Z7Neuromuscular

358-595 W

151-250% FTP · Sprint speed and neuromuscular recruitment

Sweet Spot sits between upper tempo and lower threshold.

209-224W (88-94% FTP) is a common coaching convention for efficient sub-threshold work.

Triathlon-Focused Workouts

Practical examples built from your current FTP, with Sweet Spot kept in the mix because it matters.

What FTP Actually Tells You

FTP is a practical field estimate of the power you can sustain near threshold. It is extremely useful for setting zones, structuring workouts, and building pacing plans, but it is not a perfect stand-in for every laboratory threshold marker.

In this calculator, FTP is treated as a coaching anchor. That makes it useful for consistent training decisions without pretending it is a complete physiological fingerprint.

Why Different FTP Tests Give Different Numbers

A 20-minute test, a 2×8-minute test, a ramp test, and a 60-minute maximal effort all reward slightly different strengths. Anaerobic contribution, pacing skill, and fatigue resistance can all shift the final estimate.

That is why the smartest way to use FTP is consistency: repeat the same protocol under similar conditions so the trend is meaningful.

How Triathletes Should Use FTP

Triathletes do not race at FTP. They use FTP to cap effort, organize long rides, and choose bike power that still leaves room for the run. That is why the race pacing card above uses starting ranges rather than one rigid target.

The right long-course number is always shaped by terrain, heat, fueling, and how durable you are after two or four hours at pressure.

Sweet Spot vs Threshold

Sweet Spot usually sits in the upper part of Zone 3 and the lower part of Zone 4. Coaches use it because it delivers a lot of productive work without demanding the same recovery cost as threshold intervals.

Threshold work is still valuable, especially when you need race-specific fitness, but Sweet Spot is often the more sustainable backbone for busy age-group athletes.

What To Enter From Zwift, TrainerRoad, Or A Head Unit

Most input mistakes happen when athletes paste in a number that the platform has already transformed.

Zwift or TrainerRoad 20-min test

Enter the raw 20-minute average power from the test, not the platform’s already estimated FTP.

Ramp test

Use the final full-minute or peak one-minute power value that your platform uses before it applies its own multiplier.

Head unit or race file

Only use a one-hour power file if it came from a genuinely maximal, evenly paced effort.

W/kg Reference Bands

One unified band system used across the page. This is context, not destiny.

Developing

0.0-2.49 W/kg

Building fitness and sustainable bike power

Recreational

2.5-3.49 W/kg

Consistent age-group or recreational athlete

Intermediate

3.5-4.49 W/kg

Well-trained amateur / strong club rider

Advanced

4.5-5.49 W/kg

Strong racer / high-performing amateur

Elite

5.5+ W/kg

Elite domestic / top amateur power-to-weight

Related Triathlon Tools

Bike TSS Calculator Triathlon Race Time Calculator Critical Swim Speed Calculator VDOT Calculator

Scientific References

Sources chosen to support the actual claims on this page rather than to decorate it with generic citations.

McGrath R, Greenham G, and colleagues. Accuracy of graded exercise tests to predict functional threshold power and maximal oxygen uptake in highly trained cyclists.

Open article

Karsten B, Petrigna L, Klose A, and colleagues. Relationship between the critical power test and a 20-minute functional threshold power test in cycling.

Study record

Borszcz FK, Tramontin AF, and colleagues. Functional threshold power is not equivalent to lactate parameters in trained cyclists.

PubMed

Valenzuela PL, Alejo LB, and colleagues. Time to exhaustion at functional threshold power in cyclists.

PubMed

This page is designed for self-coached age-group triathletes. It gives you a cleaner, more honest FTP workflow: one band system, contiguous zones, visible Sweet Spot, and triathlon pacing ranges that help you ride hard enough to matter without pretending the bike is the only thing that decides race day.

Informational tool. This calculator is for personal logging and awareness purposes only. FTP estimates depend on test protocol and conditions; they are not clinical assessments. Training zones are general frameworks, not individualized prescriptions. This tool is not a substitute for professional coaching or medical guidance.

Methodology

How this calculator works

Bike Power and Threshold Methodology

Cycling threshold metrics are useful because they simplify pacing and training load decisions, but they still depend on protocol quality and accurate power data.

Present FTP as protocol-dependent, not absolute truth.
Describe TSS as a planning metric that depends on sound source data.
Keep power-zone guidance aligned with practical triathlon use cases.

FAQ

Frequently asked questions

Why can FTP change between test types?

Different protocols stress different strengths. Consistency matters more than chasing the highest possible number.

How should triathletes use FTP on race day?

Use it as a starting ceiling and planning reference, then adjust for course, duration, fueling, heat, and run durability.

Evidence

References

Related calculators

Keep the next decision close.

Bike TSS Calculator

Bike

Calculate bike Training Stress Score, Intensity Factor, and target ride stress with cleaner load guidance for self-coached triathletes.

Triathlon Race Time Calculator

Triathlon

Plan swim, bike, run, and transition splits with research-informed defaults and clearly labeled race-day estimates for fatigue and fueling.

Cycling Power Zone Calculator

Bike

Enter your FTP to see all 7 Coggan power zones with watt ranges, training purpose, example workouts, and triathlon pacing context.