Critical Swim Speed Calculator

Formula

The formula to calculate the Critical Swim Speed is:

$CSS = \left(\frac{D}{T}\right) \times 100$

Where:

CSS is the Critical Swim Speed
D is the distance swum in meters
T is the time taken to swim the distance in seconds

What is Critical Swim Speed (CSS)?

Critical Swim Speed (CSS) is a concept used in swimming training to determine the maximum speed a swimmer can maintain over a prolonged period of time without fatigue. It is often used as a benchmark for designing training programs and gauging progress. CSS is typically calculated based on the time it takes a swimmer to complete two different distances, usually 200 meters and 400 meters. The difference in speed between these two distances is used to estimate the swimmer’s lactate threshold, or the point at which lactic acid begins to accumulate in the muscles faster than it can be removed, leading to fatigue. By training at or near their CSS, swimmers can improve their endurance and overall speed.

Example Calculation

Example 1:

Distance Swum (D): 200 meters
Time Taken (T): 120 seconds

Step 1: Calculate the Critical Swim Speed:

$CSS = \left(\frac{200}{120}\right) \times 100 \approx 166.67 \text{ meters per minute}$

Example 2:

Distance Swum (D): 400 meters
Time Taken (T): 300 seconds

Step 1: Calculate the Critical Swim Speed:

$CSS = \left(\frac{400}{300}\right) \times 100 \approx 133.33 \text{ meters per minute}$