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.10K Erg Time PredictorPredict your 10K erg time from a known rowing distance result. Uses Paul's Law to estimate 10,000m performance from your 2K, 5K, or 6K time.Drag Factor CalculatorEstimate your Concept2 drag factor from damper setting. Understand the difference between damper and drag factor, and find the optimal setting for your training.Rowing VO2max EstimatorEstimate your VO2max from your 2K rowing erg time. Uses the Hagerman formula to predict maximal aerobic capacity from Concept2 performance.Rowing Training Pace CalculatorCalculate your rowing training pace zones (UT2, UT1, AT, TR, AN) from your 2K erg time. Get personalised split targets for every type of training session.Rowing Power-to-Weight CalculatorCalculate your rowing power-to-weight ratio and weight-adjusted 2K time. Compare performance fairly across different body weights using the Concept2 adjustment formula.
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