Rowing Calculators & Tools
Free interactive tools for rowing and erg training. Convert splits, predict race times, calculate heart rate zones, and estimate your Effort Score.
Split Time to Watts ConverterConvert your Concept2 rowing split time (per 500m) to watts instantly. Uses the official Concept2 power formula: Watts = 2.80 / pace³.Watts to Split Time ConverterConvert watts to rowing split time (per 500m) using the official Concept2 formula. Find out what pace your power output corresponds to on the erg.Rowing Pace CalculatorCalculate your target rowing split time for any distance or duration. Plan pacing for 2K, 5K, 6K, 10K, and half marathon erg pieces.2K Time PredictorPredict your 2,000m erg time based on your current training splits, 5K time, or 6K time. Uses established rowing power-duration models.5K Time PredictorPredict your 5,000m rowing ergometer time based on your 2K result, training splits, or other test distances. Plan your 5K erg strategy.Rowing Calorie Burn CalculatorEstimate actual calories burned during a rowing workout. Accounts for body weight, intensity, and duration — more accurate than the Concept2 display.Concept2 Weight Adjustment CalculatorAdjust rowing erg scores for body weight using the Concept2 weight adjustment formula. Compare performance fairly between lightweight and heavyweight rowers.Rowing Heart Rate Zone CalculatorCalculate your five rowing heart rate zones using the Karvonen (heart rate reserve) method. Get personalised HR targets for UT2, UT1, threshold, and VO2 max training.Split Comparison ToolCompare two rowing splits side by side. See the difference in watts, total time over any distance, and the power cost of each second of pace improvement.Rowing Effort Score CalculatorCalculate your Watta Effort Score for any rowing workout. Combines cardiac load, work output, pacing, and economy into a single 0-100 score.
Get Started
Every erg counts.
Download Watta and start turning your erg sessions into data-driven training.