Rowing Split Calculator

Turn a split into watts, watts into a split, or a distance and time into your average split. Uses the same formulas as the Concept2 monitor.

Your details

Start from
/500 m
kg

Type splits and times as minutes and seconds, for example 1:52.5. Body weight is optional: it adjusts the calories to you. Figures match a Concept2 monitor.

Your results

Enter a split, a wattage, or a distance and time.

How to use it

  1. Choose what you're starting from. A split, a wattage, or a distance and time.
  2. Type splits and times as minutes and seconds, for example 1:55.0. Add your weight for a calorie figure adjusted to you.
  3. Read the result, the calories per hour, and finish times for standard distances at that split.

How it's calculated

Split to watts. The Concept2 monitor links pace and power with a fixed formula:

watts = 2.80 ÷ pace³

Pace is seconds per metre, which is your 500 m split in seconds divided by 500. A 2:00 split is 120 ÷ 500 = 0.24 s/m, and 2.80 ÷ 0.24³ = 202.5 W. Going the other way, pace = ∛(2.80 ÷ watts).

Finish times. At a steady split, time = split × distance ÷ 500. A 1:52.5 split over 2,000 m is 112.5 × 4 = 7:30.0.

Calories. Concept2 publishes the monitor equation. The monitor’s figure is 300 + 4 × watts ÷ 1.1639 kcal per hour. The divisor converts power to kcal per hour, and Concept2 uses a factor of 4 and a 300 kcal/h baseline. Concept2 bases it on a 175 lb (79.5 kg) rower and gives a correction for your weight:

calories per hour = monitor calories − 300 + 1.714 × weight in lb

Limits. These formulas describe the Concept2 machines. Other rowers and on-water rowing don’t follow the same 2.80 constant. Calories from any machine are estimates.

Sources

  1. Concept2. Pace-to-watts calculator (watts = 2.80 ÷ pace³, pace in seconds per metre).
  2. Concept2. Calorie calculator (monitor formula based on a 175 lb / 79.5 kg person; adjustment for body weight).

Questions

How do I convert a rowing split to watts?

Divide your 500 m split in seconds by 500 to get seconds per metre, cube it, and divide 2.80 by the result. A 2:00 split is 0.24 s/m, which gives about 203 watts.

Why does a small split change make such a big difference in watts?

Watts go up with the cube of speed, because water (and the erg's fan) push back harder the faster you go. Going from 2:00 to 1:50 takes about 30% more power.

Are the monitor's calories accurate?

They're consistent, not personal. The monitor assumes a 175 lb (79.5 kg) person. Add your weight and the calculator applies Concept2's own correction.

Does drag factor change my split?

The monitor measures how fast the flywheel slows down, so the split reflects the work you actually do at any damper setting. A higher damper feels heavier, but it doesn't make the same split easier or harder.

Updated November 9, 2026.