ERG Calculator
Convert rowing ergometer power into watts per kilogram and the equivalent 500 m split — the two numbers rowers use to compare performance fairly.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
This tool provides general sports and fitness estimates for educational purposes only. It is not medical advice — consult a physician before starting or intensifying training, especially if you have a cardiovascular condition.
About the ERG Calculator
The erg calculator relates rowing-machine power to pace. Concept2 ergometers use pace = 500 × (2.80 ÷ watts)^(1/3) seconds per 500 m, so doubling power does not halve the time. The tool also shows watts per kilogram, useful for comparing rowers of different sizes.
How to use it
- 1Enter your average power in watts.
- 2Enter your body weight.
- 3Press Calculate to see the 500 m split and watts per kilogram.
Worked example
200 W corresponds to a 500 m split of about 2:00.5; for a 75 kg rower that is 2.67 W/kg.
How it works
Formula
W/kg = Watts ÷ Body Weight. Split per 500 m = 500 × ∛(2.80 ÷ Watts) seconds.
Common use cases
- Setting erg training targets
- Comparing rowers
- Converting between watts and splits
Frequently asked questions
A:Concept2 uses pace (seconds per metre) = cube root of (2.80 ÷ watts); multiply by 500 for a 500 m split.
A:Around 2 W/kg for beginners, 3–4 W/kg for competitive club rowers, and 5+ W/kg for elite athletes.
A:Heavier rowers produce more absolute power, so W/kg allows comparison across weight classes.
A:It correlates strongly with boat speed but technique, rigging, and crew coordination also matter.
A:Most training is done at drag factor 110–130; the split-to-watts relationship is independent of drag factor.
Reviewed for accuracy · Last updated October 7, 2026
Formulas follow published sports-science literature and official league definitions (Karvonen heart rate reserve, Cooper and Bruce protocols, MET compendium values, and standard baseball, cricket, and basketball statistics).
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources