RA

Fast online calculators across finance, health, time, math, science and more.

Lifestyle

Water intake

Quick daily water targets from weight, exercise and the glass size you actually use.

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Use it as a guide; listen to your body and any medical advice you’ve got.

Water intake mini calculators

Start from weight, adjust for exercise, then convert into cups or bottle refills so it’s trackable.

Weight-based water goal

Simple daily target: roughly 30–40 ml per kg of body weight.

GoalL / day
With exercise

Adds extra water for workout time. Roughly +0.35 L every 30 minutes.

GoalL / day
Glasses / bottles helper

Convert your daily target into number of glasses or a bottle size that you actually track.

glasses