Rowing Pace Calculator

Rowing pace, or split, is the time it takes to row 500 meters at your current speed. It is the main number on a Concept2 rowing machine monitor, and a lower split means you are faster. This calculator finds your split from your distance and time, then turns it into watts and calories the way the monitor does.

What Rowing Pace Measures

Your split is your average speed, written as time per 500 m. It does not show how hard the row felt or how good your technique was. Watts show the same speed as power, and the calorie number is an estimate built from watts. For runs, use the Running Pace Calculator.

The Formula

Split (seconds per 500 m) = 500 x time (seconds) / distance (meters)

Watts = 2.80 / (split / 500)^3

Calories per hour on the monitor = (4 x watts / 1.1639) + 300

Split / 500 is your pace in seconds per meter, and ^3 means it is cubed. The watts formula is the one Concept2 publishes for its monitors¹. The calorie formula comes from Concept2's monitor guide, which bases it on a 175 lb person with a base rate of 300 Calories per hour².

How This Calculator Computes Your Result

Choose Distance and time to enter the meters you rowed and your time, or Pace per 500 m to type a split. Add a target distance to see how long it would take at that split. Add your body weight, if you like, for calories at your weight and a weight-adjusted time.

You get your split, watts, calories per hour as the monitor shows them, calories for your piece or target, your speed, and times for 500, 2,000, 5,000, 6,000 and 10,000 m. Splits and times are rounded to a tenth of a second, like the monitor, and watts and calories to whole numbers. The times assume you hold the same split all the way, so treat them as pacing targets, not race predictions.

What Your Result Means

A lower split means a faster row. There are no official pace bands, because a good split depends on your age, sex, size and training. This table shows what common splits mean on a Concept2 monitor, using Concept2's formulas¹ ².

Calories here are kilocalories, the same unit as food Calories.

Why Watts Climb So Fast

Watts rise with the cube of your speed¹. Going from a 2:10 split to 2:00 takes 27% more power, from 159 to 203 watts. Going from 2:00 to 1:50 takes another 30%, up to 263 watts. Even doubling your watts only cuts a 2:00 split to about 1:35. This is why the last few seconds off your split are the hardest to find.

The damper setting does not change this math. Concept2 says its monitor recalibrates on every stroke to account for the damper setting and the conditions in the room³.

What the Calorie Number Assumes

Concept2 monitors use a calorie formula based on a 175 lb (79.4 kg) person, so your own weight is not part of the number⁴. The work part, 4 x watts / 1.1639, is the same for everyone, and the 300 Calories per hour is a fixed base rate for that person².

Concept2's Calorie Calculator swaps this base for one that fits your weight⁵:

Calories per hour for your weight = monitor calories per hour - 300 + (1.714 x weight in lb)

That works out to about 1.7 Calories per hour for each pound above or below 175 lb. At a 2:30 split the monitor shows 656 Calories per hour. The correction gives about 579 for a 130 lb rower and 733 for a 220 lb rower.

Even corrected, it is an estimate. In 43 overweight and obese adults new to rowing, a Concept2 monitor overestimated energy use, measured from their breath, by about 2.3 Calories per minute at a light effort and 2.9 at a moderate one⁶. That is roughly 140 to 170 Calories per hour. The authors pointed to the monitor's general formula as a likely cause⁶.

Weight-Adjusted Times

On the water, heavier rowers have more weight to move, but the rowing machine does not penalize it. Concept2's weight adjustment corrects for this³:

Weight factor (Wf) = (weight in lb / 270)^0.222

Adjusted time = Wf x actual time

Concept2 says the adjusted 2,000 m time is a good estimate of your potential speed in an eight, given perfect conditions and near perfect rowing³. The reference rower weighs 270 lb, so most people's adjusted time is faster than their real one. A 150 lb rower's 8:20 for 2,000 m becomes 7:18.8. Adjusted times are for comparing rowers, such as in crew selection, and cannot be entered in Concept2's Online Ranking³.