Erg-to-Run Equivalence Calculator

This method uses the Hagerman/Ohio University formula to estimate VO2max from erg watts: VO2max = (watts × 10.8 + 350) / body weight (kg). This formula was validated for male rowers; the female version uses a slightly lower coefficient (10.1) to account for average mechanical efficiency differences.^[1]

Once VO2max is estimated, we convert it to equivalent running velocity and race times using the Daniels-Gilbert model — the same quadratic VO2-velocity relationship and exponential duration curve used in the VDOT system. The sustainable fraction of VO2max decreases with race duration following the Daniels exponential decay function.^[3]

Rowing and running use different muscle groups and movement patterns. A rower who rarely runs will have poor running economy (higher oxygen cost per km), meaning their actual running times will be worse than VO2max-based predictions suggest. Conversely, a rower who also runs regularly may match or exceed these predictions.

For runners looking to predict race times from running data, use our VO2 Max Runners Calculator or Running Performance Calculator.

Convert watts and splits with the ERG Calculator. Find your rowing fitness benchmarks with the Rowing CP Calculator and Rowing FTP Calculator. Track rowing calories with the Rowing Calorie Calculator. For running-specific tools, try the Magic Mile Calculator or Tinman Running Calculator.