Free tools

Free hydration tools

Simple, honest calculators and lookups — everything runs in your browser, nothing is stored, and there is no account or ads. Built by the team behind Brim.

Water Intake Calculator

Get your personalized daily water goal from your weight, activity, climate and sex. Private, instant, no signup.

Beverage Hydration Index Lookup

Which drink hydrates you better? Take the quick quiz, then see all 25 on the beverage hydration index, from milk at 130% to spirits at -300%.

How Hydrated Are You? Quiz

A 60-second private self-check using the validated urine-color scale, plus a few quick questions. Get a band, never a fake precise score.

Caffeine in Drinks

Look up the caffeine in coffee, tea, soda and energy drinks, adjusted to your serving size, with the 400 mg daily guidance for context.

Sugar in Drinks

See how much sugar is really in soda, juice and sports drinks, per your serving and in teaspoons. Some cans hit 8 teaspoons.

Mineral Water Comparison

Compare popular bottled mineral waters by magnesium, calcium and sodium, sortable, from each bottler’s published analysis.