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Estimate an adult protein planning range and daily water reference values during prescribed GLP-1 therapy.
This tool is for adults age 18 and older using an FDA-approved GLP-1 medication under a licensed clinician's care. It gives a starting point to discuss with your prescriber or registered dietitian.
National water reference values are published using female and male categories. Pregnancy and breastfeeding have different values.
Enter a weight between 40 and 700 lb, or 18 and 318 kg.
Daily protein planning range
98 to 114g
About 25 to 29 g across 4 eating occasions. This uses 1.2 to 1.4 g/kg as a planning range during active weight loss.
General adult RDA baseline from your current weight: about 65 g/day at 0.8 g/kg. Current-weight formulas can overestimate needs for some people, so a clinician may use adjusted weight or lean mass instead.
Daily beverage reference
74fl oz
About 9 cups or 2.2 liters from water and other beverages.
Total water reference: 91 fl oz or 2.7 liters, including water in food.
Do not use these estimates without individualized guidance if you have kidney disease, are on dialysis, have heart or liver disease, are pregnant or breastfeeding, are under age 18, or have been told to limit protein or fluids.
Water needs can rise with heat, sweating, fever, vomiting, or diarrhea. This calculator does not add a fixed amount for activity because losses vary. If you cannot keep fluids down, have very little urine, feel faint, or feel confused, seek medical care promptly.
Protein alone does not preserve muscle. The joint advisory also emphasizes resistance exercise and an overall nutrient-dense eating pattern. Contact your prescriber if GLP-1 side effects make it difficult to eat or drink enough.
American College of Lifestyle Medicine, American Society for Nutrition, Obesity Medicine Association, and The Obesity Society
National Academies of Sciences, Engineering, and Medicine
USDA National Agricultural Library
Centers for Disease Control and Prevention
Last reviewed August 7, 2026. This tool provides general education and does not diagnose, treat, or replace advice from a licensed clinician or registered dietitian. PepMarket products labeled for research use only are not medications and are not for human use or consumption.
