Rowing
Calculators
Every erg, physiology, and crew calculator on Flowbase. Free, in-browser, Concept2-accurate. No signup.
Erg performance
Pace, splits, zones, conversions — every erg piece in numbers.
Convert any 500m split to watts and km/h with the Concept2 formula. Two input modes, race-distance projections.
Project a target 500m split across 1K, 2K, 5K, 6K, 10K, and head-race distances. Linear pacing baseline.
Karvonen 7-zone heart-rate model from age + resting HR + (optional) max HR + 2K. Per-zone HR range and target splits.
Turn a target split and stroke rate into distance per stroke, total strokes per 2K, and projected 2K time.
Estimate your 2K time from a 1K piece. Empirical multiplier accounts for the different aerobic / anaerobic mix of each test.
Normalise any erg test (5K, 6K, 30r20, 60-min) to a 2K-equivalent power so you can compare crews on a single ladder.
Predict your next 2K from a recent benchmark + current state + taper window. Confidence band and tailored taper plan.
Physiology
Aerobic ceiling, critical power, and energy-system breakdowns.
Estimate VO2 max from your 2K time and body weight. Validates training intensity prescription and tracks aerobic ceiling over a season.
Calculate critical power and W′ from a 3-minute all-out test. The threshold separating sustainable work from finite anaerobic capacity.
Break a piece into aerobic, anaerobic-lactic, and anaerobic-alactic contributions. Drives interval prescription for distance specialists.
Compare Even, Negative, Fly & Die, and Race Smart side-by-side. W′ depletion curve and per-strategy time cost for events 1K → 26.2K.
Crew & boat
On-water speed predictions from erg + crew inputs.