SWOLF (stroke + segundos)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The SWOLF calculator measures swim efficiency by calculating the SWOLF index, which combines stroke count and time in seconds. SWOLF is calculated by adding the number of strokes completed during a swim segment to the total time taken for that segment. This index evaluates a swimmer's technical and physical performance, particularly in training sessions focused on style improvement or endurance.
To use the calculator, input the number of complete strokes during a set distance and the total time in seconds. The result shows your SWOLF score, where lower values indicate higher efficiency (less effort per unit of distance). It is commonly used in pools to track progress in technique, hydrodynamics, or muscle strength.
Notes: Ensure the distance is consistent for valid comparisons. Avoid inaccurate stroke counts, as one complete stroke includes both arms. SWOLF does not replace other metrics like absolute speed but provides insights into technical efficiency.
Frequently asked questions
What is the SWOLF index?
SWOLF is a swimming efficiency metric that adds the number of strokes and time in seconds to cover a fixed distance. Lower values indicate higher efficiency.
How do I use the calculator?
Enter the number of complete strokes and time in seconds. The calculator sums the values to provide your SWOLF score.
Which swimming styles is SWOLF valid for?
SWOLF applies to all styles but is most common in freestyle or backstroke training due to consistent stroke patterns.
What affects the SWOLF result?
Factors like technique, hydrodynamics, muscle strength, and rhythm influence the index. Consistent training can reduce SWOLF over time.