Critical Swim Speed (CSS)
Calculate Critical Swim Speed (CSS) instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
Critical Swim Speed (CSS)
400m time, s
200m time, s
CSS
1.0526m/s
More about: Critical Swim Speed (CSS)
What it calculates
The “Critical Swim Speed (CSS)” calculator computes CSS in m/s from 2 parameters: 400m time, s, 200m time, s.
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Example calculation
With parameters 400m time, s = 360, 200m time, s = 170 the result is 1.05 m/s.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.