SWOLF = strokes per length + seconds per length. For a 25m pool: completing the length in 18 strokes and 22 seconds gives a SWOLF of 40. Lower SWOLF indicates better efficiency (faster with fewer strokes).

What SWOLF score is efficient?

In a 25m pool, SWOLF under 35 is excellent, 35-40 is good, 40-45 is developing. In a 50m pool (Olympic), halve these values. Context matters—a high-cadence open water swimmer will have higher SWOLF than a distance-per-stroke swimmer.

How is SWOLF improved?

Reduce strokes per length through: front-end lead arm technique, stronger catch and pull-through, higher elbow catch, streamlined body position, and underwater dolphin kick off walls. Better turns also reduce SWOLF significantly.

SWOLF Swimming Efficiency Score

Calculate SWOLF score (strokes per length + seconds per length) as a measure of swimming efficiency, and track improvements in stroke economy across training sessions.

Use the full interactive calculator below, or

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Frequently Asked Questions

What is SWOLF?

What SWOLF score is efficient?

How is SWOLF improved?