Health & Fitness Calculators
Sweat Rate Calculator
Enter your weight before and after exercise, plus fluid consumed, to calculate your estimated sweat rate.
1.23 L/hour
estimated sweat rate
Assumes 1 pound of body weight lost equals about 1 pint of sweat, and ignores urine output during exercise for simplicity. Knowing your sweat rate helps plan fluid replacement — most athletes lose 0.5-2 liters per hour, though it varies a lot by heat, humidity, and individual physiology.
How to use this tool
- 1Weigh yourself right before and right after exercise (same clothing, ideally).
- 2Enter fluid consumed during exercise.
- 3Enter the exercise duration.
- 4See your estimated sweat rate.
Frequently asked questions
Why does sweat rate matter?+
Knowing your sweat rate helps you plan fluid replacement during exercise to avoid both dehydration and overhydration, especially for longer or hotter workouts.