Free, no-sign-up GLP-1 calculators built for people who actually inject themselves.
GLP1Calculator.com is a free educational tool for anyone using GLP-1 receptor agonists like semaglutide, tirzepatide, and retatrutide. We provide:
The GLP-1 community has grown enormously. People mix their own peptides, calculate doses by hand on napkins, and Google "5mg semaglutide BAC water" at 11pm. The math is simple โ concentration = mg รท mL โ but doing it correctly under stress (or while half-asleep) is how mistakes happen.
We built this because we got tired of opening Excel every Sunday night to figure out our next injection volume. Now you don't have to.
GLP1Calculator.com is independent and not affiliated with Novo Nordisk, Eli Lilly, or any pharmaceutical manufacturer. We don't sell GLP-1 medications, peptides, or pharmacy services.
We're not a medical site. We don't diagnose, prescribe, or treat. Every page on this site clearly states that GLP-1 medications are prescription-only and should be used under the supervision of a licensed healthcare provider.
All calculators are free with no signup. We earn a small affiliate commission when readers purchase peptide vial cases through our partner site, VialCase. This pays for hosting, domain, and our time. We only recommend products we'd use ourselves.
Questions, feedback, corrections? See our contact page.