Estimate Sweat Rate during Exercise

Use change in body mass, fluid wey person drink and urine estimate fluid loss.

Your numbers

Estimated rate of sweating

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This approximation treat 1 kg mass change as 1 L and leave out breathing/metabolic changes. E no be prescription for fluid or sodium intake.

Health inputs stay for this tab. Link sharing no dey available.

Formula

Estimate L = A−B+D−U and R = L/t. A and B na body mass before and after exercise for kg; D and U na drink and urine volumes for L; t na hours. Di approximation dey treat one kilogram of mass change as one litre of fluid; R dey for L/h.

Use change in body mass, fluid wey person drink and urine estimate fluid loss.

Example wey show the calculation

Body mass before exercise (kg): 75
Body mass after exercise (kg): 74.5
Fluid wey person drink (L): 0.5
Urine wey person pass (L): 0
How long exercise last (hours): 1

Estimated rate of sweating: 1 L/h
Estimated fluid wey sweat remove: 1 L

Where e fit work and limits

This approximation treat 1 kg mass change as 1 L and leave out breathing/metabolic changes. E no be prescription for fluid or sodium intake.

We check inputs for missing values and allowed ranges. Result wey pass the finite numeric range no go show. Rounding affect wetin display, while calculation use the model numeric precision.

Check your units and assumptions before you rely on result. Changing label no convert currency or physical unit.

Version of di formula: 160122f3e340 · Example don get check: 2026-10-30

Method