Watts Per Kilogram Calculator

Determine your watts per kilogram (W/KG) for use in cycling training. This metric is also used in virtual cycling programs like Zwift for ranking riders into categories (A-D).

Weight

Units

Power (Watts)

Watts Per Kilogram

Zwift Category (A-D)

Zwift Category D
0 - 2.4 W/KG

Zwift Category C
2.5 - 3.1 W/KG

Zwift Category B
3.2 - 4 W/KG

Zwift Category A
4+ W/KG

Understanding W/KG

Watts per kilogram is a relative measure of a rider's strength that considers both their raw power output and body weight. So if two riders are outputting the same number of watts, the lighter rider will have the higher W/KG. Consider the following example:

Rider #	Power (W)	Weight (KG)	W/KG
1	200 W	91 kg (200 lbs)	2.20
2	200 W	68 kg (150 lbs)	2.94

Even though both riders are outputting the same power, rider 2 can be considered a "stronger" rider because they are doing it at a lighter weight. The difference is not as noticeable on flat ground but has significant benefits when climbing. Rider 2 is lighter and will climb faster than rider 1.

There are two ways to increase W/KG over time. Increase power output or lose weight while maintaining the same power level.

Watts Per Kilogram Chart

WATTS KG	45	55	65	75	85	95	105	115	125	135
100 WATTS	2.22 W/KG	1.82 W/KG	1.54 W/KG	1.33 W/KG	1.18 W/KG	1.05 W/KG	0.95 W/KG	0.87 W/KG	0.80 W/KG	0.74 W/KG
110 WATTS	2.44 W/KG	2.00 W/KG	1.69 W/KG	1.47 W/KG	1.29 W/KG	1.16 W/KG	1.05 W/KG	0.96 W/KG	0.88 W/KG	0.81 W/KG
120 WATTS	2.67 W/KG	2.18 W/KG	1.85 W/KG	1.60 W/KG	1.41 W/KG	1.26 W/KG	1.14 W/KG	1.04 W/KG	0.96 W/KG	0.89 W/KG
130 WATTS	2.89 W/KG	2.36 W/KG	2.00 W/KG	1.73 W/KG	1.53 W/KG	1.37 W/KG	1.24 W/KG	1.13 W/KG	1.04 W/KG	0.96 W/KG
140 WATTS	3.11 W/KG	2.55 W/KG	2.15 W/KG	1.87 W/KG	1.65 W/KG	1.47 W/KG	1.33 W/KG	1.22 W/KG	1.12 W/KG	1.04 W/KG
150 WATTS	3.33 W/KG	2.73 W/KG	2.31 W/KG	2.00 W/KG	1.76 W/KG	1.58 W/KG	1.43 W/KG	1.30 W/KG	1.20 W/KG	1.11 W/KG
160 WATTS	3.56 W/KG	2.91 W/KG	2.46 W/KG	2.13 W/KG	1.88 W/KG	1.68 W/KG	1.52 W/KG	1.39 W/KG	1.28 W/KG	1.19 W/KG
170 WATTS	3.78 W/KG	3.09 W/KG	2.62 W/KG	2.27 W/KG	2.00 W/KG	1.79 W/KG	1.62 W/KG	1.48 W/KG	1.36 W/KG	1.26 W/KG
180 WATTS	4.00 W/KG	3.27 W/KG	2.77 W/KG	2.40 W/KG	2.12 W/KG	1.89 W/KG	1.71 W/KG	1.57 W/KG	1.44 W/KG	1.33 W/KG
190 WATTS	4.22 W/KG	3.45 W/KG	2.92 W/KG	2.53 W/KG	2.24 W/KG	2.00 W/KG	1.81 W/KG	1.65 W/KG	1.52 W/KG	1.41 W/KG
200 WATTS	4.44 W/KG	3.64 W/KG	3.08 W/KG	2.67 W/KG	2.35 W/KG	2.11 W/KG	1.90 W/KG	1.74 W/KG	1.60 W/KG	1.48 W/KG
210 WATTS	4.67 W/KG	3.82 W/KG	3.23 W/KG	2.80 W/KG	2.47 W/KG	2.21 W/KG	2.00 W/KG	1.83 W/KG	1.68 W/KG	1.56 W/KG
220 WATTS	4.89 W/KG	4.00 W/KG	3.38 W/KG	2.93 W/KG	2.59 W/KG	2.32 W/KG	2.10 W/KG	1.91 W/KG	1.76 W/KG	1.63 W/KG
230 WATTS	5.11 W/KG	4.18 W/KG	3.54 W/KG	3.07 W/KG	2.71 W/KG	2.42 W/KG	2.19 W/KG	2.00 W/KG	1.84 W/KG	1.70 W/KG
240 WATTS	5.33 W/KG	4.36 W/KG	3.69 W/KG	3.20 W/KG	2.82 W/KG	2.53 W/KG	2.29 W/KG	2.09 W/KG	1.92 W/KG	1.78 W/KG
250 WATTS	5.56 W/KG	4.55 W/KG	3.85 W/KG	3.33 W/KG	2.94 W/KG	2.63 W/KG	2.38 W/KG	2.17 W/KG	2.00 W/KG	1.85 W/KG
260 WATTS	5.78 W/KG	4.73 W/KG	4.00 W/KG	3.47 W/KG	3.06 W/KG	2.74 W/KG	2.48 W/KG	2.26 W/KG	2.08 W/KG	1.93 W/KG
270 WATTS	6.00 W/KG	4.91 W/KG	4.15 W/KG	3.60 W/KG	3.18 W/KG	2.84 W/KG	2.57 W/KG	2.35 W/KG	2.16 W/KG	2.00 W/KG
280 WATTS	6.22 W/KG	5.09 W/KG	4.31 W/KG	3.73 W/KG	3.29 W/KG	2.95 W/KG	2.67 W/KG	2.43 W/KG	2.24 W/KG	2.07 W/KG
290 WATTS	6.44 W/KG	5.27 W/KG	4.46 W/KG	3.87 W/KG	3.41 W/KG	3.05 W/KG	2.76 W/KG	2.52 W/KG	2.32 W/KG	2.15 W/KG
300 WATTS	6.67 W/KG	5.45 W/KG	4.62 W/KG	4.00 W/KG	3.53 W/KG	3.16 W/KG	2.86 W/KG	2.61 W/KG	2.40 W/KG	2.22 W/KG
310 WATTS	6.89 W/KG	5.64 W/KG	4.77 W/KG	4.13 W/KG	3.65 W/KG	3.26 W/KG	2.95 W/KG	2.70 W/KG	2.48 W/KG	2.30 W/KG
320 WATTS	7.11 W/KG	5.82 W/KG	4.92 W/KG	4.27 W/KG	3.76 W/KG	3.37 W/KG	3.05 W/KG	2.78 W/KG	2.56 W/KG	2.37 W/KG
330 WATTS	7.33 W/KG	6.00 W/KG	5.08 W/KG	4.40 W/KG	3.88 W/KG	3.47 W/KG	3.14 W/KG	2.87 W/KG	2.64 W/KG	2.44 W/KG
340 WATTS	7.56 W/KG	6.18 W/KG	5.23 W/KG	4.53 W/KG	4.00 W/KG	3.58 W/KG	3.24 W/KG	2.96 W/KG	2.72 W/KG	2.52 W/KG
350 WATTS	7.78 W/KG	6.36 W/KG	5.38 W/KG	4.67 W/KG	4.12 W/KG	3.68 W/KG	3.33 W/KG	3.04 W/KG	2.80 W/KG	2.59 W/KG
360 WATTS	8.00 W/KG	6.55 W/KG	5.54 W/KG	4.80 W/KG	4.24 W/KG	3.79 W/KG	3.43 W/KG	3.13 W/KG	2.88 W/KG	2.67 W/KG
370 WATTS	8.22 W/KG	6.73 W/KG	5.69 W/KG	4.93 W/KG	4.35 W/KG	3.89 W/KG	3.52 W/KG	3.22 W/KG	2.96 W/KG	2.74 W/KG
380 WATTS	8.44 W/KG	6.91 W/KG	5.85 W/KG	5.07 W/KG	4.47 W/KG	4.00 W/KG	3.62 W/KG	3.30 W/KG	3.04 W/KG	2.81 W/KG
390 WATTS	8.67 W/KG	7.09 W/KG	6.00 W/KG	5.20 W/KG	4.59 W/KG	4.11 W/KG	3.71 W/KG	3.39 W/KG	3.12 W/KG	2.89 W/KG
400 WATTS	8.89 W/KG	7.27 W/KG	6.15 W/KG	5.33 W/KG	4.71 W/KG	4.21 W/KG	3.81 W/KG	3.48 W/KG	3.20 W/KG	2.96 W/KG