SWOLF is time for one pool length plus the number of strokes for that length. It is a training metric for swim efficiency.

Is lower SWOLF always better?

Usually lower is more efficient, but only within the same context. Over-gliding can reduce stroke count while hurting race pace.

Can I compare 25 m and 50 m pools?

Only roughly. Turns, push-offs and fatigue differ, so compare your own results in similar conditions whenever possible.

SWOLF Calculator

Calculate SWOLF from pool length, length time and stroke count, with distance per stroke, stroke rate and scenario comparisons.

Pool length

Length time, seconds

Stroke count

Count one arm consistently, such as right-arm strokes only. Many recreational 25 m lengths land around 16-24.

The scale is a rough 25 m freestyle reference. A 50 m result is normalized by course distance, so comparisons remain approximate.

SWOLF

22 sec, 18 strokes

Level

Good

Strong recreational reference

Distance per stroke

1.39 m

Stroke rate

49 /min

Calculation

Length time: 22 sec. Strokes: 18. Final SWOLF: 40.

SWOLF scenarios

Scenario	SWOLF	Change	Level
2 fewer strokes	38	-2	Good
1 fewer stroke	39	-1	Good
Current	40	-	Good
2 seconds faster	38	-2	Good
1 second and 1 stroke faster	38	-2	Good

One saved stroke changes SWOLF the same as one saved second. Whether time, DPS or both are easier to improve depends on technique, stroke and training goal.

Calculate SWOLF score

SWOLF, or Swim Golf, combines length time and stroke count into one swim-efficiency metric. It is best used to compare repeated swims in the same pool, stroke and measurement method.

SWOLF = t + strokes

t is length time in seconds.

Read SWOLF with context

A lower SWOLF usually means less time, fewer strokes or both.
Pool length, turns, body size, stroke style and device counting can change the score.
Use the scenarios to compare time and stroke-count changes without treating SWOLF as a universal ranking.