Watts per Kilogram (W/kg)

By the Watta Team · Updated

Watts per Kilogram (W/kg): Watts per kilogram (W/kg) is power output divided by body weight. It lets rowers of different sizes compare performance fairly.

What is Watts per Kilogram (W/kg)?

Watts per kilogram (W/kg) divides erg power output by the rower's body weight. On the erg, absolute watts determine split time regardless of weight — but W/kg provides a fair comparison across weight categories and is more relevant for on-water rowing where the boat must carry the athlete. Typical 2K test values: recreational 2.0-2.5 W/kg, competitive club 3.0-3.5 W/kg, collegiate 3.5-4.0 W/kg, international 4.0-5.0+ W/kg. W/kg is closely related to the Concept2 weight-adjusted scoring system but is simpler to calculate and understand. Lightweight rowers often have excellent W/kg ratios despite lower absolute watts, which is why lightweight events exist in competitive rowing.

How Watta Uses Watts per Kilogram (W/kg)

Watta calculates W/kg from your average watts and profile weight, providing normalised comparisons on the leaderboard. The Effort Score's Work Output component uses a weight-adjusted formula so that lighter rowers are not penalised for lower absolute watts.

Further Reading

Frequently Asked Questions

What is watts per kg in rowing?
Watts per kilogram (W/kg) is your power output divided by your body weight. It normalises performance so lighter and heavier rowers can compare fairly.
How do I calculate my W/kg?
Convert your average split to watts using the formula Watts = 2.80 / pace³ (where pace is in seconds per metre). Then divide by your weight in kg. For a 2:00 split (203W) at 80kg: 203/80 = 2.54 W/kg.
What W/kg do I need for my 2K goal?
Sub-7:00 (men): approximately 3.0 W/kg at 80kg. Sub-6:30: approximately 3.5 W/kg. Sub-8:00 (women): approximately 2.5 W/kg at 65kg. These are estimates; exact requirements depend on your actual weight.
Is W/kg more important than absolute watts?
On the erg, absolute watts determine your time. On the water, W/kg matters because the boat carries your weight. For erg benchmarking across weight categories, W/kg is the fairer metric.

Related Content

Watts (Rowing)Watts in rowing measure the power output on an ergometer, calculated from the pace using the Concept2 formula: Watts = 2.80 / pace³.Power-to-Weight RatioPower-to-weight ratio in rowing is the relationship between erg power output (watts) and body weight (kg), used to compare performance across different weight categories.2K TestA 2K test is a 2,000-metre maximal effort rowing ergometer test — the standard benchmark for indoor rowing performance, used for team selection and fitness assessment.Rowing Power OutputRowing power output is the rate of work produced during each stroke, measured in watts, and is the primary objective measure of rowing intensity on an ergometer.Average WattsAverage watts is the mean power output sustained across an entire rowing workout or interval, providing a single number to summarise overall intensity.Rowing Weight CategoriesRowing has two weight categories, lightweight and open (heavyweight). On the water, lightweight crews average at most 70kg (men) or 57kg (women); Concept2 erg rankings use 75kg and 61.5kg.Weight Adjustment CalculatorSplit to Watts ConverterPower-to-Weight CalculatorHow to Improve Your 2K TimeFor Lightweight RowersFor Competitive Rowers