Sweat Rate Calculator
Weigh yourself before and after training, add what you drank, and work out how much fluid you lose per hour so you can replace it properly.
Enter your details above and the result will appear here.
How to use
- Weigh yourself right before training and enter it.
- Weigh yourself right after, in similar clothing, and enter it.
- Enter fluids drank, any urine passed, and the duration.
Note
Sweat loss = (pre weight - post weight) + fluid intake - urine, treating 1 kg of weight change as 1 litre of fluid — the standard sports science weight-change method. Sweat rate varies a lot with heat, humidity and intensity. Estimate only — not medical advice.