* Purpose:* To examine the relationship between the maximal power output (MPO) in an individualized 7 × 2-minute incremental (INCR) test, average power in a 2k (W

_{2k}) rowing ergometer test, and maximal oxygen uptake (

*A total of 34 male club rowers (age 18–30 y) performed a 2k and an INCR test in a Concept2 rowing ergometer to determine and compare MPO, W*

**Methods**:_{2k}, and

*No significant difference was found between*

**Results**:*P*= .73). A very high correlation coefficient (

*r*= .96) was found between MPO and

_{2k}and

*r*= .93). Linear regression analyses were developed for predicting

^{−1}) = 11.49 × MPO + 810 and

_{2k}: (2)

_{2k}+ 1168. Cross-validation analyses were performed using an independent sample of 14 rowers. There was no difference between the mean predicted

^{−1}) or the 2k test (4.39 L·min

^{−1}) and the observed

^{−1}). Technical error of measurement was 3.1% and 3.6%, standard error of estimate was 0.136 and 0.157 mL·min

^{−1}, and validation coefficients (

*r*) were .95 and .94 using Equation () and (), respectively.

*A prediction model only including MPO or W*

**Conclusion**:_{2k}explains 88% to 90% of the variability in