Training & health
Sweat Rate & Hydration Calculator
Measure your own sweat rate from body-weight change and fluid intake — the evidence-based method.
Free · instant · no sign-upDeterministic
Result
Sweat rate1300ml/hour
Your measured fluid loss per hour in these conditions.
Total sweat loss1300ml
Measured method: (weight lost + fluid drunk) ÷ hours. Sweat rate changes with heat, humidity and intensity — remeasure across conditions. Not medical advice.
The formula
Measured sweat rate
sweat/hr = (weight lost + fluid drunk) ÷ hours
Source: Standard sports-science sweat-testing method
What it means
- Your own sweat rate beats any generic hydration rule.
- Repeat it in different heat and intensity to learn your range.
Limitations
- Not medical advice; do not use to manage a medical condition.
- Weigh in minimal dry clothing for accuracy.
Educational only
This calculator gives general, educational estimates about training and physiology — not personal, medical or nutritional advice. Numbers vary between individuals; check with a qualified coach or healthcare professional before acting on them.
Keep exploring
Follow the threads from this tool into the wider knowledge base.