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Concept2 Score Calculator

Enter your 500m split and distance to see watts and projected time.

How it is calculated

You enter the 500 m split as a number of seconds, so 1:45 is typed as 105, and a distance in metres. The pace is pace = split / 500 in seconds per metre. Power follows the Concept2 relationship watts = 2.80 / pace³, shown to one decimal. The projected time is simply pace × distance, shown as minutes:seconds with one decimal. This means the projection holds the same pace for the whole distance: there is no fatigue model, so a pace you can hold for 2,000 m is not what you will manage over 6,000 m. If the distance is empty or not above zero, 2,000 m is used. The split must be above zero, and a value such as 1:45 with a colon is not accepted.

Worked example

A rower holds a 1:45 split, which is 105 seconds per 500 m, over a 2,000 m piece. Pace: 105 / 500 = 0.21 s per metre. Cubed, that is 0.009261, so watts are 2.80 / 0.009261 = 302.3, shown as 302.3 W. Projected time: 0.21 × 2,000 = 420 seconds, which the tool shows as 7:00.0. The pace line repeats the split as 1:45.0 /500m. Changing only the distance to 5,000 m gives 17:30.0 at the same watts.

Try this example →

Common mistakes

  • Typing the split as 1:45 or 1.45. The field takes seconds, so write 105; a colon gives no result, and 1.45 would mean 1.45 seconds per 500 m.
  • Using the 2k split to project a long steady piece. The projection keeps the same pace for any distance, so a 5k or 6k result will be faster than you can actually row.
  • Expecting the split to be proportional to watts. Power depends on the cube of speed, so a few seconds off the split add a lot of watts; going from 1:45 to 1:40 is much more than 5 percent more power.
  • Entering the average pace shown on the monitor in a different unit, such as per 1,000 m. The formula assumes the standard 500 m split.
  • Leaving the distance unreadable or negative and trusting the result. It silently falls back to 2,000 m, so check that the projected time matches the distance you meant.

Sources

About this calculator

On a Concept2 rowing ergometer, performance is usually reported as a 500m split — the pace it would take to row 500 metres at your current effort — but comparing splits across different distances or converting them to a physical power output requires the machine's own formula: watts = 2.80 / pace³, where pace is the split expressed in seconds per metre (split time in seconds for 500m, divided by 500). This cubic relationship reflects that drag on the flywheel (and hence required power) grows with roughly the cube of speed.

Once you know your watts, projecting a finish time over a different distance just reverses the formula to find the pace that produces the same power output, then scales it to the target distance — the calculation rowers and coaches use to compare a 2k test piece against a 5k or 6k steady-state row, or to set pace targets for interval training. This calculator converts your 500m split into watts and projects your finish time over any distance you choose.

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Comments (1)

  • Editorial team

    Power rises with the cube of speed, so small pace gains are worth more than they look. Going from a 2:00 to a 1:50 split (8 percent faster) lifts output from 202.5 to about 263 W, roughly 30 percent. The projection just holds your split for the whole distance, which fatigue rarely allows. What split do you hold for 2000 m?

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