Splitwright

Splitwright is the calculator every erg session needs. Enter a 500m split and it returns watts, pace per kilometre, calories per hour and speed using the real cube-law relationship — and it works in every direction, including projecting a distance from a time or a time from a distance.

The interval planner builds a session from reps, work distance, rest and target split, showing total work, rowing time and elapsed time with rest, then saves it as a named plan you can reopen rep by rep.

The workout log records date, piece, distance, time and rate, computes the average split and derives your personal bests from the log rather than storing them separately.

Ten standard pieces are set out with pacing plans and a target split offset from your 2k, alongside stroke-rate bands with metres per stroke, a technique reference and the common faults with their fixes. Offline, no account.