About the Stroke Rate Calculator
Stroke rate (strokes per minute) and distance per stroke for swimming or rowing, plus SWOLF score.
Also known as: spm calculator, strokes per minute, distance per stroke, swolf calculator.
How to use this calculator
- Enter strokes counted, over this many seconds, distance covered (m).
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Stroke rate = strokes ÷ time × 60 · SWOLF = seconds + strokes per length
Worked example
Using the values pre-filled in the calculator above:
- Strokes counted = 38
- Over this many seconds = 60
- Distance covered (m) = 50
the calculator returns:
- Stroke rate: 38 spm
- Seconds per stroke: 1.58
- Distance per stroke: 1.32 m
- SWOLF (per 25 m): 49