Cycling Category Calculator (Zwift)

Enter your FTP (Functional Threshold Power) in watts and your body weight in kilograms to find your Zwift racing category. The calculator computes your watts per kilogram (W/kg) and maps it to the official Zwift categories A, B, C, or D — so you know exactly which races to enter.

Disclaimer: This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions.

W

Your 60-minute maximal sustainable power output. If using a 20-min test, multiply by 0.95.

kg

Your weight in kilograms.

Results

Zwift Racing Category

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Watts per Kilogram (W/kg)

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Category W/kg Range

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W/kg to Next Category

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Results Table

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Frequently Asked Questions

What is FTP and how do I measure it?

FTP (Functional Threshold Power) is the maximum average power you can sustain for one hour, measured in watts. The most common way to estimate it is a 20-minute all-out test — take your average power for 20 minutes and multiply by 0.95. On Zwift, you can use the built-in FTP test or ramp test to get an accurate estimate.

What are the Zwift racing categories?

Zwift uses four main racing categories based on your W/kg (watts per kilogram): Category A is 4.0 W/kg and above (advanced/elite), Category B is 3.2–3.99 W/kg (strong), Category C is 2.5–3.19 W/kg (intermediate), and Category D is below 2.5 W/kg (beginner/recreational). ZwiftPower may apply slightly different cut-offs depending on the event.

Why does weight matter for Zwift categories?

Zwift categories are based on watts per kilogram (W/kg), not raw watts, because lighter riders can sustain higher relative power outputs on climbs. Dividing your FTP by your weight normalises performance across different body types and makes category placement fairer.

What is Coggan's FTP chart and how does it relate to Zwift?

Coggan's training levels classify cyclists from untrained to world-class using W/kg benchmarks. Zwift's categories roughly align with these levels — Category D corresponds to untrained/fair, C to moderate, B to good, and A to excellent/exceptional. It's a widely used framework for understanding cycling fitness.

What is ZwiftPower and how does it use critical power charts?

ZwiftPower is the official results platform for Zwift racing. It uses critical power (CP) data — your best efforts over various durations — rather than just FTP to assign and police categories. If your CP curve exceeds a category's limits, you can be upgraded or disqualified from results.

Can I race in a lower Zwift category than my W/kg suggests?

No — entering a lower category when your FTP/W/kg qualifies you for a higher one is against Zwift's rules and considered sandbagging. ZwiftPower monitors race results and will automatically upgrade or DQ riders who exceed category limits.

How do I improve my Zwift category?

Improving your category requires increasing your FTP (through structured training such as threshold and VO2max intervals) and/or reducing body weight. Even small gains in W/kg — 0.1 to 0.2 W/kg — can move you into the next category over a few months of consistent training.

Does gender affect Zwift categories?

The standard W/kg category thresholds apply equally to all riders by default. However, some Zwift events run separate women's categories with adjusted thresholds to ensure competitive racing. Always check the specific event rules before signing up.