Calculator

Water Intake Calculator

Enter your weight, activity level and temperature to get a rough daily hydration target.

Your inputs

Rule of thumb: 30 to 35 ml per kg is a starting point. Heat and movement push the target up.

Estimated target

Lower range
2.1 L
Upper range
2.5 L
Heat adjustment
0 ml
Practical goal
2.3 L

This is a rough estimate, not a medical prescription. If you have a relevant condition, ask a clinician.

Brim keeps this target visible all day

Log intake in a few taps, keep the current goal on your home screen and avoid manual recalculation.

Free on the App Store

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