Enter stroke, pool length, single-length time and stroke count to compute SWOLF, distance per stroke, stroke rate and an efficiency grade for swimming economy and technique.
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Index composition | index = seconds per length + stroke count, lower is more economical | Swimming training practice |
| Rate and distance per stroke | speed = stroke rate x distance per stroke | Swimming biomechanics |
| Pool length | indices from 25 m and 50 m pools are not directly comparable | Swimming training practice |