How to Calculate Sweat Rate
What is Sweat Rate?
Sweat rate measures fluid loss during exercise, essential for personalised hydration strategies. It varies enormously: 0.5–2.5 L/hour depending on exercise intensity, temperature, humidity, and individual genetics.
Step-by-Step Guide
- 1Weigh before exercise (nude, dry)
- 2Exercise at target intensity for measured duration · record any fluid consumed
- 3Weigh after exercise (nude, dry)
- 4Sweat rate = (Pre weight − Post weight + fluid consumed) / exercise duration
Worked Examples
Input
Pre-weight 70kg · Post-weight 69.2kg · 500mL consumed · 60min
Result
Sweat rate = (0.8kg + 0.5L) / 1hr = 1.3 L/hr
1g weight loss ≈ 1ml fluid
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