How to Calculate Hydration Calculator
What is Hydration Calculator?
Daily water requirements vary based on body weight, physical activity, and climate. The European Food Safety Authority (EFSA) recommends 2.0 litres/day for adult women and 2.5 litres/day for adult men from all sources (food and drink). The 35 ml/kg baseline accounts for roughly 60% of these requirements from beverages.
Step-by-Step Guide
- 1Base: 35 ml per kg body weight per day
- 2Activity bonus: +350 ml (moderate exercise) to +700 ml (intense exercise)
- 3Climate bonus: +200 ml (warm) to +500 ml (hot/humid)
- 4All fluid counts: water, milk, juice, tea, coffee (moderate)
Worked Examples
Frequently Asked Questions
What is Hydration?
Daily water requirements vary based on body weight, physical activity, and climate. The European Food Safety Authority (EFSA) recommends 2
How accurate is the Hydration calculator?
The calculator uses the standard published formula for hydration. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.
What units does the Hydration calculator use?
This calculator works with kilograms, inches, litres, percentages. You can enter values in the units shown — the calculator handles all conversions internally.
What formula does the Hydration calculator use?
The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.