Programmatic reference

Water intake by body weight

Your body weight is the single biggest driver of how much water you need. Pick your exact weight below for a ready-made daily goal in litres and ounces — or jump straight to the full calculator to factor in activity and climate.

These pages use a baseline of about 0.5–0.75 oz of water per pound of body weight (30–40 ml per kg), then assume a moderately active day in a temperate climate. Each page shows the exact number for that weight, plus a chart, FAQ, and a live calculator to fine-tune it.

In pounds

In kilograms

Want the exact number?

Your weight is just the start. Add activity, climate, and life stage for a goal made for you.

Open the calculator