Summary
General daily fluid volume estimate from weight, activity, and climate — not a medical order.
Calculation details
This general estimate varies with diet, weather, health, pregnancy, medication, and sweat losses. More is not always better; excessive water intake can be harmful.
Formula
Litres = 0.033 × kg + 0.35 × each 30 activity minutes + climate adjustment; cups = litres / 0.236588.
Worked example
Water intake worked example
The estimate is shown in litres and US cups.
How it works
Enter body weight, daily activity minutes, and a climate band. Individual needs still vary with diet, health, and environment.
Frequently asked questions
Is this a medical diagnosis?
No. It is an educational estimate and cannot diagnose a condition or replace individualized professional advice.
Why can my actual result differ?
Diet, climate, health conditions, and sweat losses change fluid needs; more is not always safer.
When is this calculator most useful?
Use it as a general planning estimate, then adjust with thirst, urine color, and clinical advice.
How are results rounded?
The calculation retains full precision; centralized display formatting rounds only the visible result.