W/kg calculator.
Watts per kilo · category · rank · speed
Enter your FTP and weight, or drag the line across the curve. You see your W/kg straight away, the Zwift category you race in and how many real racers sit behind you.
FTP · among Zwift racers · profile values
Peloton · Level 3 of 8 · 64 % of the way to Domestique (239 W)
| Level | Top % | Threshold | You |
| 8 · Hors Catégorie | 2 % | 363 W | +132 W |
| 7 · World Class | 8 % | 315 W | +84 W |
| 6 · Breakaway | 18 % | 284 W | +53 W |
| 5 · Puncheur | 30 % | 262 W | +31 W |
| 4 · Domestique | 45 % | 239 W | +8 W |
| 3 · Peloton | 60 % | 217 W | ✓ |
| 2 · Gruppetto | 80 % | 183 W | |
| 1 · Coffee Ride | — | — |
Real data: n = 155,453 Zwift racers in segment · Source: profile FTP, zwiftracing profiles, March 2026 survey
With your Zwift ID linked: every duration automatically, your weight from your profile — and your weakest duration with its recipe in Coach Lab. Run it on your Zwift ID →
Your category follows your FTP. Pick FTP above and it shows up here.
Speed needs sustained power. Pick FTP, 5 or 20 minutes above.
Is 250 watts good?
Among the 155,453 Zwift racers with a profile FTP in our data, the middle sits at 231 watts. A 250-watt FTP puts you ahead of about 63 percent of them, 200 watts ahead of 29 percent, 300 watts ahead of 88 percent.
In a race, though, watts only count together with weight. Every kilo slows you on a climb, which is why riders compare watts per kilogram: 250 watts at 75 kilos is 3.3 W/kg, at 62 kilos it is 4.0.
What is a good W/kg?
The best yardstick is the categories Zwift uses to split its start groups. For the 2026/27 season, by FTP: below 2.63 W/kg you race D, from 2.63 W/kg C, from 3.36 W/kg B and from 4.2 W/kg A. A to C also carry a floor in watts: 150, 200 and 250 watts.
Where you sit inside your category is what the curve above shows. And if you want to know at which duration you lose time in a race, the Coach Lab works it out from your real bests.
Where the numbers come from
The distribution comes from public race profiles on zwiftracing.app, collected in March 2026: profile FTP for the FTP curve, 90-day race bests for the short durations. Speed uses the same physics as the Segment Lab, solo and without wind. None of it is estimated or produced by an AI.
Zwift is a trademark of Zwift, Inc.; independent project, no affiliation. Sport, not medicine.