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/ Swimming Pace (CSS) Calculator
Swimming Pace (CSS) Calculator
Calculate your Critical Swim Speed (CSS) and determine threshold training paces based on 400m and 100m tests.
What is Critical Swim Speed (CSS)?
**Critical Swim Speed (CSS)** is an estimation of your aerobic threshold pace in swimming. It is defined as the maximum speed you can maintain continuously without exhaustion, corresponding directly to your lactate threshold in running or cycling.
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It is recommended to re-test your CSS every 6 to 8 weeks to track improvement and adjust training targets.
These distances allow the calculator to exclude anaerobic capacity (the 100m sprint) to isolate pure aerobic threshold speed.