Power-to-Weight Ratio
By the Watta Team · Updated
What is Power-to-Weight Ratio?
Power-to-weight ratio (watts per kilogram) normalises erg performance across different body weights. A heavier rower typically produces more absolute watts but may have a lower watts-per-kg ratio than a lighter rower. On the erg, absolute watts determine your split time regardless of weight — a 200W output produces the same split whether you weigh 60kg or 100kg. However, on water, weight matters because the boat must carry you. Concept2 publishes a weight adjustment that uses the formula: Adjusted Time = Actual Time × (body weight in lb ÷ 270)^0.222. This allows lightweight and heavyweight rowers to compare performances more fairly. Typical values: recreational rowers produce 2.0-2.5 W/kg on a 2K test; elite rowers reach 4.0-5.0+ W/kg.
How Watta Uses Power-to-Weight Ratio
Watta uses body weight in the Effort Score calculation. The Work Output component (35% of score) adjusts raw watts using a logarithmic scale that accounts for body weight, ensuring the score is meaningful across different weight categories.
Further Reading
- Concept2 Training Resources — Official training guides and workout plans from Concept2.
- Concept2 RowErg Specifications — Technical specifications and performance monitor details.
- World Rowing — The international governing body for the sport of rowing.