How do you measure sweat rate?

Weigh yourself before and after 60 minutes of exercise without drinking. Sweat rate (L/hr) = (pre-exercise weight kg - post-exercise weight kg) + fluid consumed (L). Each 1 kg weight loss = approximately 1 L of sweat.

What is a typical sweat rate?

Average sweat rates are 0.5-1.5 L/hour at moderate intensity. In hot conditions or at high exercise intensity, rates can reach 2-3 L/hour. Elite marathoners have been measured at up to 3.7 L/hour.

How should fluid intake match sweat rate?

The goal is typically to replace 75-80% of fluid lost to avoid both dehydration and overdrinking. Drinking to thirst is evidence-based for most activities, but ultra-endurance events require more precise fluid planning.

Sweat Rate During Exercise Calculator

Calculate your sweat rate (L/hour) by comparing body weight before and after exercise with known fluid intake. Essential for personalized hydration planning.

Core Tools

Distance covered in 12 minutes (meters)

🏅 Sports Note: These calculators provide estimates based on population data and validated formulas. Individual results vary by physiology, training level, and testing conditions. Consult a qualified coach or sports scientist for personalized guidance.

How to Use

Enter the values for the scenario you are assessing. Calculate your sweat rate (L/hour) by comparing body weight before and after exercise with known fluid intake. Essential for personalized hydration planning. Use the sweat rate result to inform your calculation.

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Sweat Rate During Exercise Calculator

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Frequently Asked Questions

How do you measure sweat rate?

What is a typical sweat rate?

How should fluid intake match sweat rate?