Hydration Tool

Sauna Sweat Loss Calculator

Estimate your session's sweat loss, fluid replacement, and sodium needs with a model built for sauna rounds, rest breaks, and cold plunge.

Uses model-based ranges, not medical advice.

Adding weigh-in details narrows the estimate.

How To Read It

Built around real session rhythm.

The calculator separates total sweat produced from net fluid deficit, then estimates electrolyte loss with credible ranges. Start with body weight and a simple sauna plan, or add scale readings, drinks, and cold plunge details for a tighter result.