Free business calculator
Hydration Calculator
Estimate a daily fluid target from body weight, activity time, heat, and bottle size.
- Instant results
- Private in your browser
- PDF report included
Use the result well
A clear answer, with the assumptions visible
These recommendations turn the result into an operational next step without hiding the inputs behind a score.
- 1
Drink to thirst and spread fluids through the day instead of forcing a large amount at once.
- 2
Include food, other drinks, sweat rate, and medical advice when they matter.
- 3
During long or hot activity, plan electrolytes and heat safety with qualified guidance.
How this tool works
- Start with a broad weight-based fluid estimate.
- Add a cautious activity and climate allowance.
- Turn the total into bottle refills and an even schedule.
Build it in Bookify
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