Erg Watts to Split Converter
Convert between rowing power in watts and 500m split time.
Instantly switch from watts to pace or pace to watts for your erg workouts.
The Concept2 cubic relationship
Every Concept2 erg uses one equation to convert between power and pace:
watts = 2.80 ÷ (split ÷ 500) ^ 3
where split is in seconds per 500m. The flip:
split_seconds = 500 × (2.80 ÷ watts) ^ (1/3)
Why a cube? Because water resistance — and Concept2’s air resistance, which mimics water — scales with the cube of velocity. To row twice as fast you need eight times the power. The PM5 monitor does this math hundreds of times per second; the calculator above does it once.
Reference table — the splits and watts every rower memorises
| 500m split | Watts | Effort level |
|---|---|---|
| 2:30 | 75 | Easy warm-up |
| 2:15 | 102 | Aerobic base |
| 2:00 | 146 | Solid steady state |
| 1:50 | 190 | Threshold |
| 1:45 | 218 | Tempo / 5K race pace |
| 1:40 | 252 | 2K race pace (recreational) |
| 1:35 | 295 | 2K race pace (collegiate) |
| 1:30 | 345 | 2K race pace (elite) |
| 1:25 | 411 | World-class 2K |
| 1:20 | 491 | Sub-6:30 2K territory |
| 1:15 | 595 | Sprint power only |
The watts column is “average watts the flywheel sees.” Power on the handle is higher; the difference is drivetrain efficiency, fan damping setting, and the impossibly short recovery between strokes.
Damper setting does not change the formula
A common beginner question: does damper setting change watts? No. The same wattage produces the same split regardless of damper. What changes is how the stroke feels (heavier or lighter) and the optimal stroke rate. Most coaches set damper 3 to 5 for endurance work, 5 to 7 for power work. Setting it to 10 turns the erg into a strength training tool, not a rowing simulation.
Why bigger rowers go faster
Power-to-weight is meaningless on a stationary erg. Absolute power wins, and bigger rowers produce more absolute power because they have more muscle mass. A 200 lb collegiate rower pulling 350 watts in a steady-state piece is rowing at 1.75 watts per kg — solid, not exceptional. A 130 lb lightweight pulling the same 350 watts is at 2.96 watts per kg — and on the water, where the boat carries less weight, that lightweight is more competitive than the absolute number suggests.
The PR rule
If you have a strong PR over 2K and want to know what watts to hold for a 5K, multiply your 2K watts by about 0.78. For a 10K, multiply by 0.68. For a 60-minute test, by about 0.60. The drop is steeper than running because rowing recruits more muscle mass and produces more local fatigue.