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About this tool
Rowing calories, watts and 500 m split from distance, time and stroke rate using the Concept2 power formula.
The Rowing Machine Calorie Calculator takes the distance and time from an indoor rowing session and returns the average power in watts, the 500 m split and the calories burned, using Concept2's own published formulas: watts = 2.80 ÷ (seconds per metre)³ and kcal per hour = (4 × watts) + 300. It shows both the number the monitor would display and a version adjusted for your body weight, because the 300 kcal/hr term in that formula assumes a 175 lb (79.4 kg) rower. Enter an average stroke rate as well and you also get strokes taken, metres per stroke and joules per stroke.
Open Rowing Machine Calorie Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
The monitor's 175 lb figure and a body-weight-adjusted one, so you can see the size of the difference instead of guessing.
Watts come from the cube-law pace formula the Concept2 PM uses, so a 2:00 split returns 202.5 W exactly as their chart does.
Add your average rate and it reports metres per stroke and joules per stroke, the numbers that expose a rushed drive.
Concept2 monitors use kcal per hour = (4 × watts) + 300, where watts come from your pace. The 4 kcal per watt-hour reflects a gross mechanical efficiency near 21.5%, and the fixed 300 kcal/hr covers the non-propulsive cost of moving your own body up and down the slide.
Because Concept2 fixes the 300 kcal/hr baseline term rather than asking for your weight, and 175 lb (79.4 kg) is the reference body mass behind it. Only that baseline scales with body mass — a watt costs the same energy whoever produces it — so this tool rescales the 300 by your weight ÷ 79.4 kg and leaves the propulsive term alone.
Divide your 500 m split in seconds by 500 to get seconds per metre, then compute 2.80 ÷ (seconds per metre)³. A 2:00 split is 0.24 s/m, giving 2.80 ÷ 0.24³ = 202.5 watts; because the relationship is cubic, going 10% faster costs roughly 37% more power.
Gross calories are everything your body burned during the session; net calories subtract what you would have burned at rest over the same minutes. This tool computes the resting portion at 1 MET — 3.5 mL of oxygen per kg per minute, at 5 kcal per litre of oxygen — and reports the net figure separately, which is the more honest number for a food diary.
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