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Sweat Rate Calculator

Sweat rate from exercise weight loss

💧Sweat Rate Calculator

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.

  1. 1Weigh before exercise (nude, dry)
  2. 2Exercise at target intensity for measured duration · record any fluid consumed
  3. 3Weigh after exercise (nude, dry)
  4. 4Sweat rate = (Pre weight − Post weight + fluid consumed) / exercise duration
Pre-weight 70kg · Post-weight 69.2kg · 500mL consumed · 60min=Sweat rate = (0.8kg + 0.5L) / 1hr = 1.3 L/hr1g weight loss ≈ 1ml fluid

Fun Fact

Andy Murray reportedly loses 3+ litres of sweat in a 3-set tennis match. At the 2015 Australian Open in 40°C heat, some players lost up to 3% of body weight in a single set.

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