Peptide Reconstitution Calculator

If a licensed provider prescribed you a compounded peptide (compounded semaglutide, sermorelin, and others often ship as a powder), you have to mix it with bacteriostatic water and convert your prescribed dose into syringe units. The arithmetic is simple, but this is exactly where dangerous errors happen — mixing up micrograms and milligrams is the classic one, and it's a 1,000-fold mistake.

This calculator does the math and sanity-checks your numbers: if your inputs imply drawing most of a vial in one dose or more than a full syringe, it flags a probable unit mix-up instead of handing you a wrong answer. What it deliberately doesn't do: suggest doses, protocols, or where to buy anything. Your dose comes from your prescriber; the pharmacist who dispensed your vial can verify your math in thirty seconds — ask them.

If you're considering peptides that aren't prescribed — so-called research compounds — read our peptide guides first: they cover what the evidence actually shows and the purity and contamination problems of the unregulated market that no calculator can fix.