10K Erg Time Predictor

By the Watta Team · Updated March 2026

The 10K erg time predictor estimates your 10,000-metre rowing ergometer performance from a shorter distance result using Paul's Law. The 10K is one of the most popular endurance tests on the Concept2, requiring sustained aerobic output for 35-45 minutes at competitive levels. Because the 10K relies heavily on aerobic capacity, predictions from shorter tests carry inherent uncertainty — they assume a similar aerobic-to-anaerobic contribution ratio. The calculator applies a pace degradation exponent of 0.04, which models how pace decays as distance increases on the erg. Results are most accurate when predicting from distances of 2,000m or longer.

10K Time Predictor

minsec
Predicted 10K Time37:19.61:52.0 /500m avg

How This Works

Enter a known distance and your time for that distance. The calculator computes your average pace (seconds per metre), then applies Paul's Law with a 0.04 degradation exponent: predicted time = known pace × 10000 × (10000/known distance)^0.04. This models the empirical observation that erg pace slows by roughly 5-6% when doubling distance. The output shows your predicted 10K total time and average 500m split.

Formula

Predicted time = (known time / known distance) × 10000 × (10000 / known distance)^0.04

Examples

A rower with a 7:00 2K time

Predicted 10K time is approximately 37:17, with an average split of about 1:51.9/500m.

A rower with a 19:30 5K time

Predicted 10K time is approximately 39:47, with an average split of about 1:59.4/500m.

An elite rower with a 6:00 2K time

Predicted 10K time is approximately 31:55, with an average split of about 1:35.8/500m.

Benchmarks

LevelValue
Elite MaleSub-31:00 (1:33 split)
Collegiate Male32:00-35:00 (1:36-1:45 split)
Club Male35:00-40:00 (1:45-2:00 split)
Elite FemaleSub-35:00 (1:45 split)
Recreational40:00-50:00+ (2:00-2:30 split)

Watta Integration

Watta tracks all your test piece times and automatically predicts performance across distances, so you can set informed targets for your next 10K erg.

Frequently Asked Questions

Related Content

2K Time Predictor5K Time PredictorTraining Pace CalculatorSplit TimeSplit time is the pace expressed as the time it takes to row 500 metres on an ergometer, displayed in minutes and seconds (e.g. 2:00.0/500m).UT2 TrainingUT2 (Utilisation Training 2) is a low-intensity aerobic rowing zone performed at 55-70% of heart rate reserve, forming the foundation of endurance training for rowers.Aerobic ThresholdThe aerobic threshold is the exercise intensity at which lactate begins to accumulate above resting levels, typically occurring at 55-70% of VO2 max in rowers.10K Rowing GuideSteady State Rowing Guide
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