Calculate stroke rate and distance per stroke to assess efficiency.
Speed is stroke rate multiplied by distance per stroke, so improving either raises speed. SWOLF combines both into one number, which is why it tracks technique better than time alone. Increasing stroke rate without maintaining stroke length usually leaves speed unchanged while raising effort, which is the most common swimming plateau.
Swimming Stroke Rate
Stroke rate = strokes × 60 ÷ seconds; SWOLF = seconds + strokes
These figures are estimates based on population-average formulas and are intended for training and recreational planning only. They are not medical advice. Consult a qualified health professional before starting or changing an exercise programme, particularly if you have an existing medical condition.
Stroke rate = strokes × 60 ÷ seconds; SWOLF = seconds + strokes Speed is stroke rate multiplied by distance per stroke, so improving either raises speed. SWOLF combines both into one number, which is why it tracks technique better than time alone.
Increasing stroke rate without maintaining stroke length usually leaves speed unchanged while raising effort, which is the most common swimming plateau.
This calculator takes 3 inputs: Strokes counted, Length swum, Time for that length. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.