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Pool length and turns affect comparisons between yards and metres. Everything is calculated in your browser; nothing you type is uploaded.

Pace = time ÷ distance × 100. CSS = (400 − 200) ÷ (T₄₀₀ − T₂₀₀).

1,500 m in 28:45 is 1:55.0 per 100 m; a 6:40 400 m and 3:10 200 m give a CSS of 1:45.0 per 100 m.