General health
Water intake estimator
Estimate a simple daily fluid baseline from body weight.
How to use this calculator
Enter Body weight. Estimate a simple daily fluid baseline from body weight. The answer updates when you change an input.
Understanding the result
Fluid needs vary substantially; this calculator supplies only a simple baseline estimate.
Common questions
What assumptions does this result use?
Climate, activity, pregnancy, illness, diet and clinician advice can materially change needs.
Are intermediate values rounded?
No. The calculation retains JavaScript number precision internally and formats only the displayed result unless the stated method requires a discrete whole value.