Sweat Rate Formula
The Sweat Rate Formula helps you quantify the amount of fluid your body loses through sweat during exercise, which is crucial for developing a personalized hydration strategy. Understanding your sweat rate prevents dehydration and optimizes performance.
Formula
Copy the exact expression or work through it step by step below.
Sweat Rate = (Pre Session Weight - Post Session Weight + Fluid Intake - Urine Output) / Hours Trained Variables
SR
Sweat Rate
The sweat rate assumption used in the sweat rate calculation.
PSW
Pre Session Weight
The pre session weight value plugged into the sweat rate calculation.
PSW
Post Session Weight
The post session weight value plugged into the sweat rate calculation.
FI
Fluid Intake
The fluid intake value plugged into the sweat rate calculation.
UO
Urine Output
The urine output value plugged into the sweat rate calculation.
HT
Hours Trained
The hours trained value plugged into the sweat rate calculation.
Step By Step
- 1
Set the baseline case with the real calculator inputs.
Pre Weight Kg = 70, Post Weight Kg = 69.2, Duration Minutes = 60.0%, Fluid Consumed Ml = 500
- 2
Translate rates, periods, and cash values onto the same footing before combining them.
Keep the sweat rate assumptions consistent instead of mixing monthly and annual views.
- 3
Apply the formula and read the first calculator outputs, not just the headline assumption.
The calculator lands with sweat rate lper hr at 1.30% and total fluid lost l at 1.3.
- 4
Run one changed scenario so the formula is stress-tested before it is trusted.
The sweat rate calculator page is the fastest way to compare that second case.
Worked Example
Sweat Rate sample case
Pre Weight Kg
70
Post Weight Kg
69.2
Duration Minutes
60.0%
Fluid Consumed Ml
500
Sweat Rate = (Pre Session Weight - Post Session Weight + Fluid Intake - Urine Output) / Hours Trained using pre weight kg 70, post weight kg 69.2, duration minutes 60.0%, fluid consumed ml 500.
The calculator lands with sweat rate lper hr at 1.30% and total fluid lost l at 1.3.
Common Variations
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Sources & References
- ACSM position stand: Exercise and fluid replacement — American College of Sports Medicine (ACSM)
- International Society of Sports Nutrition Position Stand: nutrient timing — Journal of the International Society of Sports Nutrition (JISSN)
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