Free tool

Water calculator

A GLP-1 quiets thirst along with appetite, so it is easy to drink too little without noticing.

Educational estimate, not medical advice. Your clinician decides what is right for you. How this is calculated.

How it works

Morning starts from 30 ml per kilogram of body weight and keeps the result between 2 and 3 liters, the same rule as the app. Food and other drinks count toward it too.

water (L/day) = weight (kg) × 0.03, kept between 2 and 3 L

When to drink more

Hot days, exercise, and days with nausea, vomiting or diarrhea all raise what you need. Sipping steadily is easier than drinking a lot at once, especially when your stomach feels full.

Questions

Why does a GLP-1 affect thirst?

The same signals that quiet hunger can quiet thirst, so you may simply not feel like drinking.

Can I drink too much?

Very large amounts in a short time can be harmful, and some conditions call for limits. If you have heart or kidney disease, ask your clinician for your number.

Sources

  • EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on dietary reference values for water. EFSA Journal 2010;8(3):1459.

Related tools

Fiber calculatorA daily fiber target, with simple foods that get you there and help with constipation.Protein calculatorYour daily protein target on a GLP-1, split per meal, with easy foods for low-appetite days.GLP-1 weight timelineWhere the trials averaged on tirzepatide or semaglutide, roughly when, and how much could be muscle.

Guides that go deeper

Diarrhea on GLP‑1s: how long it lasts and what helpsDiarrhea hit 30% on Wegovy and 19% to 23% on Zepbound in trials, mostly during dose increases. Here is what helps and when to call.Nausea on a GLP‑1: why it happens and what helpsNausea hit 44% on Wegovy 2.4 mg and 25% to 29% on Zepbound in trials. It peaks after dose increases and usually eases. What helps, and when to call.Fatigue on a GLP‑1, and what helpsTiredness was reported by 11% on Wegovy 2.4 mg and 5% to 7% on Zepbound, vs 3% to 5% on placebo. Eating far less, fluids and sleep often play a part.Traveling with a GLP‑1 pen: storage, TSA and shot dayHow long GLP-1 pens can stay out of the fridge, what TSA allows in your carry-on, and how labels handle shot day when you travel.

All guides and tools →

Ready when you are

Start your morning, today.

Seven days of everything, free. No free tier that hides the useful parts.

Download for iOS

7 days free · Nothing charged today