Rowing Power-to-Weight Calculator
By the Watta Team · Updated
Enter a 2K time and your body weight to get watts per kilogram and a weight-adjusted 2K. A 7:00 2K is 3.56 W/kg at 85 kg and 4.32 W/kg at 70 kg.
Power-to-Weight Calculator
Lighter rowers get a faster adjusted time, heavier rowers a slower one. Bands are an indicative convention, not a selection standard.
Rowing this later? Watta logs the real piece from a photo of your PM5 — free on iPhone.
Watts per kilogram at a 7:00 and a 7:30 2K
Computed with the same functions as the calculator above, so the two cannot disagree.
| Body weight | 7:00 2K | Band | 7:30 2K | Band |
|---|---|---|---|---|
| 60 kg | 5.04 W/kg | World Class | 4.10 W/kg | Elite |
| 70 kg | 4.32 W/kg | Elite | 3.51 W/kg | Advanced |
| 80 kg | 3.78 W/kg | Advanced | 3.07 W/kg | Intermediate |
| 90 kg | 3.36 W/kg | Advanced | 2.73 W/kg | Intermediate |
| 100 kg | 3.02 W/kg | Intermediate | 2.46 W/kg | Beginner |
W/kg matters most in a boat, where you carry your own weight. On the erg the flywheel does not care, which is what the weight-adjustment calculator corrects for.
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About This Calculator
The rowing power-to-weight calculator computes your watts-per-kilogram ratio from a 2K erg time and body weight. Power-to-weight is the fairest single metric for comparing rowing ability across body sizes: heavier athletes have a natural advantage in absolute watts on the erg, but also more mass to move in a boat, and W/kg captures fitness per unit of body mass. The calculator also applies Concept2's weight-adjustment exponent (0.222) to produce a weight-adjusted 2K normalised to 75 kg, so two rowers of different weights can be compared on one number. Concept2's own calculator normalises to 270 lb instead, which makes every adjusted time faster in absolute terms but ranks rowers identically.
How This Works
Enter your 2K time and body weight. The calculator derives average watts from your split with the Concept2 formula and divides by your weight for W/kg. It also computes a weight-adjusted 2K as actual time × (your weight ÷ 75)^0.222 — lighter than 75 kg gives a faster adjusted time, heavier a slower one. The ratio is placed in an indicative band.
Formula
Examples
7:00 2K at 85 kg
Average watts ≈ 302W, power-to-weight ≈ 3.56 W/kg (Advanced). Weight-adjusted 2K ≈ 7:12 at the 75 kg reference — slower, because 85 kg is above it.
7:00 2K at 70 kg
Average watts ≈ 302W, power-to-weight ≈ 4.32 W/kg (Elite). Weight-adjusted 2K ≈ 6:54 — the lighter athlete has the better ratio and the faster adjusted time.
6:30 2K at 95 kg
Average watts ≈ 378W, power-to-weight ≈ 3.97 W/kg (Advanced). Weight-adjusted 2K ≈ 6:51 at the 75 kg reference.
Worked examples are generated from the same formulas as the calculator above.
Benchmarks
| Level | Value |
|---|---|
| World class | 5.0+ W/kg |
| Elite | 4.0–5.0 W/kg |
| Advanced | 3.2–4.0 W/kg |
| Intermediate | 2.5–3.2 W/kg |
| Beginner | 1.8–2.5 W/kg |
More reference tables — 2K, 5K and 500m standards, watts by level, stroke rates and a split-to-watts table — are on the Stats & Benchmarks page.
In the Watta App
Watta stores your body weight in your profile and uses it, with your 2K watts, in the Work Output part of the Effort Score. It does not display W/kg directly — this page does that.
Frequently Asked Questions
What is a good power-to-weight ratio for rowing?
Is power-to-weight more important than raw watts?
How does the 0.222 exponent work in weight adjustment?
Should I lose weight to improve my power-to-weight ratio?
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Which Rowing App Should You Use?
Every erg counts.
Photograph your erg screen after the piece and Watta logs it for you.
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