Hydration Loss Rate Calculator
Calculate fluid loss rate during exercise from pre and post-exercise body weight, fluid consumed, and exercise duration.
Sweat Rate
2,000 mL/hr
Sweat Rate vs Exercise Duration
Calculating Sweat Rate
Sweat rate determines how much fluid you need to replace during exercise. Weight loss during exercise is primarily from sweat.
Formula
Total Sweat Loss (mL) = (Pre-Weight - Post-Weight) x 1000 + Fluid Consumed
Sweat Rate (mL/hr) = Total Sweat Loss / Duration (hours)
Dehydration beyond 2% of body weight impairs performance. Athletes typically sweat 500-2500 mL/hour depending on intensity, heat, and individual physiology.
Example Calculation
An athlete drops from 75 kg to 73.5 kg during 60 minutes of exercise while drinking 500 mL.
- 01Weight loss = 75 - 73.5 = 1.5 kg = 1,500 mL
- 02Total sweat = 1,500 + 500 = 2,000 mL
- 03Sweat rate = 2,000 / 1 hour = 2,000 mL/hr
- 04Dehydration = 1.5 / 75 x 100 = 2.0%
Frequently Asked Questions
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