Split per 500m: The time to cover 500 meters at your current effort. This is the universal rowing benchmark — lower splits mean faster pace. Competitive rowers typically hold 1:30–1:50 for a 2K test.
Watts: The mechanical power output derived from your split using the Concept2 formula. Watts scale cubically with pace, so shaving a few seconds off your split requires a disproportionately large increase in effort.
Calories per Hour: An estimate of total energy expenditure that combines your wattage with body weight. This uses the Concept2 calorie formula and may differ from what your erg PM5 displays due to rounding.
Predicted Times: Projected finish times at 500m, 1K, 2K, 5K, and 10K assuming you hold the same split throughout. Real-world pacing typically involves faster or slower segments.
How This Calculator Works
You enter any two of distance, time, or 500m split, and the tool derives the third. It then computes watts using the Concept2 erg formula: watts = 2.80 ÷ (split/500)³. Calories per hour use the formula (4 × watts) + (0.35 × body weight in lbs), defaulting to 155 lbs if no weight is entered. Speed and predicted race times are derived directly from the split.
Quick Questions
What is a good 2K erg time?
For recreational rowers, sub-8:00 is a solid benchmark. Competitive club rowers often target 6:30–7:30, and elite athletes aim for sub-6:00. Times vary significantly by age, gender, and weight class.
Why do watts matter more than split for training?
Watts measure actual power output and scale consistently. A 10-second split improvement at 2:00 requires far less additional power than the same improvement at 1:40. Tracking watts helps you set linear training targets.
How accurate is the calorie estimate?
The formula is the same one Concept2 uses in their PM5 monitors. It provides a reasonable estimate but doesn't account for rowing efficiency, stroke rate, or metabolic differences between individuals.
What drag factor should I use?
Concept2 recommends a drag factor of 120–140 for most rowers. Higher drag simulates rowing in heavier water but doesn't necessarily mean a better workout. The calculator doesn't factor in drag — only your pace.
Can I use this for on-water rowing?
The watts and calorie formulas are specific to the Concept2 ergometer. On-water pace depends on boat type, crew weight, current, and wind, so splits aren't directly comparable.