Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Swimming Stroke Efficiency Calculator

Calculate your SWOLF score by adding stroke count and lap time for a 25m or 25-yard length. Use it to track swimming efficiency and find the best balance between stroke rate and speed.

Stroke Count (per 25m/y) (strokes)

25m/y Lap Time (seconds)

Fill in the required fields to see your result.

Swimming

Swimming Drag Coefficient Calculator

Calculates the hydrodynamic drag force acting on a swimmer based on velocity, body position, stroke technique, and body size. Use it to quantify how much resistance poor posture or technique adds.

Swimming Velocity (m/s)

Body Position

Stroke Efficiency

Swimmer Weight (kg)

Fill in the required fields to see your result.

Key differences

	Swimming Stroke Efficiency Calculator	Swimming Drag Coefficient Calculator
Category	Swimming	Swimming
Inputs required	2	4
Result	SWOLF Score (points)	Drag Force (Newtons)
What it does	Calculate your SWOLF score by adding stroke count and lap time for a 25m or 25-yard length. Use it to track swimming efficiency and find the best balance between stroke rate and speed.	Calculates the hydrodynamic drag force acting on a swimmer based on velocity, body position, stroke technique, and body size. Use it to quantify how much resistance poor posture or technique adds.