About the SWOLF Calculator
This SWOLF calculator works out the swim golf score that swim watches show after every length: the seconds it takes to swim one pool length plus the number of strokes you took. Like golf, a lower score is better, because it means you are covering the length faster, with fewer strokes, or both.
SWOLF is useful for swimmers and triathletes working on technique. Comparing scores at the same pace shows whether a drill or a change in stroke rate is making you more efficient. The calculator also gives your pace per 100, distance per stroke, and a version scaled to a 25 m length so you can compare a 50 m or 25 yd pool session with a 25 m one.
Scores only compare fairly in the same pool length and stroke. Count each arm entry as one stroke (as most watches do); some coaches count stroke cycles instead, which roughly halves the stroke part of the score.
With the default inputs, the swolf score is 38. Change any value above to recalculate instantly.
How to use the swolf calculator
- 1Choose your pool length.
- 2Time one length (or average several) in seconds.
- 3Count your strokes for that length — every arm entry.
- 4Read your SWOLF and compare it with earlier sessions at a similar pace.
Formula and method
SWOLF (swim + golf) simply adds the seconds taken to swim one pool length to the number of strokes used. Fewer strokes at the same speed, or the same strokes at a faster speed, both lower the score, so it captures speed and stroke length together. Swim watches usually average it over every length of a set.
Because a 50 m length has twice the time and strokes of a 25 m length, the calculator also scales the score by 25 ÷ pool length in metres (a 25 yd length is 22.86 m) for rough comparison. Distance per stroke is pool length ÷ strokes and stroke rate is strokes × 60 ÷ time. The scaled figure ignores the extra push-offs in shorter pools.
- time
- Seconds to swim one length
- strokes
- Arm strokes counted for that length
Worked examples
25 m length in 22 s with 16 strokes
22 seconds plus 16 strokes gives a SWOLF of 38. At 22 s per 25 m the pace is 1:28 per 100 m, and each stroke covers 25 ÷ 16 = 1.56 m.
50 m length in 45 s with 36 strokes
In a long-course pool the score is 45 + 36 = 81. Halved to a 25 m equivalent that is 40.5, slightly less efficient than the 25 m example, with 1.39 m per stroke at 48 strokes a minute.
25 yd length in 20 s with 14 strokes
A 25 yd length (22.86 m) in 20 s with 14 strokes scores 34. Scaled to 25 m it is about 37.2, and each stroke covers 1.63 m.
Frequently asked questions
What is a good SWOLF score?+
As a rough guide for a 25 m pool, many recreational freestyle swimmers score in the 40s and 50s, fit triathletes and masters swimmers in the 30s, and elite swimmers in the 20s to low 30s. The useful comparison is your own score over time at a similar pace.
Is a lower SWOLF always better?+
Lower generally means more efficient, but you can lower it artificially by gliding with very few strokes or by sprinting. Compare scores at a similar effort and pace, and use it alongside your pace and stroke rate.
Does my watch count strokes the same way?+
Most swim watches count one stroke each time the watch arm completes a pull, then double it or report it per length. Settings differ between brands, so do not compare scores across different devices or counting methods.
Can I compare SWOLF between a 25 m and 50 m pool?+
Not directly — a 50 m length takes roughly twice as long and twice as many strokes. Use the scaled 25 m figure for a rough comparison, keeping in mind that short-course pools give extra push-offs that make you look more efficient.