Use this simple calculator to calculate your Critical Swimming Speed (CSS) and estimate your ideal swimming speed training zones in meters or yards.
A critical swimming speed test is an easy way to measure your swimming fitness. Estimate the pace per 100 that she would maintain during a maximum time trial of 1500 meters or yards.
To test your CSS rhythm, you must swim a maximum time trial of 400 and 200 within the same session, with an active recovery of five minutes between each, and time for both. Then simply enter your times below and let the calculator do its magic.
To learn more about CSS, you can read our introduction to CSS training under the calculator below.
After calculating your swim pace zones, you can also print your results or download them as a PDF below. Enjoy!
Swimming Critical Speed Calculator
How should I calculate my values? Swim a maximum time trial of 400 and 200 in the same session, with an active recovery of five minutes between each, and take time for both. Enter your 400 and 200 meter times below.