An educational starting point for daily protein on the bariatric journey, during GLP-1 therapy, or in long-term metabolic health. Bands are drawn from ASMBS, Obesity Canada, and ISSN guidance, then tempered for real-world appetite and post-op stage. Always follow your bariatric team's personalised target.
Educational tool, not medical advice. This calculator estimates a starting protein range using published guidelines. It is not personalised nutrition advice, diagnosis, or a prescription. Always follow the protein target your bariatric team, dietitian, or prescriber has given you. Call your local emergency number for urgent symptoms.
Your details
Used for the ideal-body-weight formula (Devine). Not a comment on gender identity — it is a biological input to the math.
Pounds.
Feet · Inches.
Affects target floor and ceiling.
Earlier stages cap the target at what the stomach can realistically hold.
Meals + protein-forward snacks or shakes.
Adds a small upward adjustment if you are actively training.
Daily target
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Press Calculate to see your starting target.
Evidence range
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Range from published body-weight protein formulas.
Per protein event
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Splits the daily target across your protein events.
How this works
Ideal-body-weight uses the Devine formula (men: 50 kg + 2.3 kg per inch over 60; women: 45.5 kg + 2.3 kg per inch over 60).
Evidence range applies published bands: 1.0–1.2 g/kg for maintenance, 1.3–1.6 g/kg for fat loss with lean-mass preservation, and 1.4–2.0 g/kg for muscle building (ISSN, ASMBS).
Bariatric surgery sets a floor based on ASMBS post-op minimums (typically 60–80 g/day for LSG/RYGB, 80–100 g/day for BPD-DS/SADI-S). Stage caps prevent suggesting more volume than an early post-op stomach can hold.
Reduced or very low appetite (common with GLP-1 medications) tempers the daily target downward toward what is realistic, not what is maximal. Consistency at a slightly lower target generally beats failing to hit a higher one.
Per-meal target divides the daily target across your protein events for easy tracking. Many bariatric clinics teach roughly 20–30 g per event.
Sources
American Society for Metabolic & Bariatric Surgery (ASMBS) Integrated Health Nutritional Guidelines — ASMBS Clinical Practice Guidelines
International Society of Sports Nutrition (ISSN) Position Stand: Protein and Exercise — jissn.biomedcentral.com
Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm. 1974;8:650-655 (Ideal Body Weight formula).
Want personalised guidance?
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