Calculate a weight-adjusted 2K rowing time or reverse an adjusted target to the raw erg time required at a given body weight.
How Weight Adjustment Works
The Concept2 formula first converts body weight to pounds and calculates a factor: body weight divided by 270, raised to the power 0.222. Multiplying a raw time by that factor produces the adjusted time.
| Body weight | Weight factor | Effect on the same raw time |
|---|---|---|
| 135 lb | About 0.857 | Adjusted time is shorter |
| 180 lb | About 0.914 | Adjusted time is shorter |
| 270 lb | 1.000 | Adjusted and raw times match |
| Above 270 lb | Above 1.000 | Adjusted time is longer |
What the score means
The method accounts for the extra hull drag associated with greater crew weight and estimates potential speed in an eight. It is a coaching comparison, not a correction to the ergometer itself.
Reverse mode
When an adjusted target is known, the calculator divides that target by the weight factor to show the raw 2K erg time needed. The raw split and average watts then follow from that required time.
Sources
Source: Concept2, Weight Adjustment Calculator, current online edition; accessed August 8, 2026.