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Sweat Rate Calculator

Weigh dry, minimal clothing, after using the toilet.
Towel off sweat first, same clothing as the pre weigh-in.
Worked example result
Total sweat loss2.20 L
Sweat rate1.47 L/hour
Body mass lost1.75%
Replacement target — low end (1.25×)1.75 L
Replacement target — high end (1.5×)2.10 L

From 80.0 to 78.6 kg over 90 minutes, with 1.0 L drunk and 0.2 L urinated: sweat loss is 2.2 L, a rate of about 1.47 L/h. Net mass loss is 1.75%, so the rapid-recovery replacement target is about 1.75–2.10 L with sodium.

Sweat loss (L) = (pre kg − post kg) + fluid drunk (L) − urine (L) · Sweat rate = sweat loss ÷ hours · Replace 1.25–1.5 L per kg of net mass lost · Powered by CalcHub — Sweat Rate Calculator