About Peptide Calculate

Peptide Calculate is a free set of calculators for two audiences: people who already have a prescribed or research-protocol dose and need to convert it into a syringe draw, and researchers who need standard peptide chemistry calculations — molecular weight, isoelectric point, extinction coefficient, and molarity.

What this site does

Every calculator performs a fixed arithmetic conversion on numbers you supply. Nothing on this site chooses a dose, suggests a starting point, or autofills a “typical” amount for any compound. You provide the numbers; the calculator does the unit math and shows its work.

What this site does not do

This site does not provide medical advice, does not store accounts or personal health data, and is not affiliated with any peptide manufacturer or supplier. See the medical disclaimer for the full detail, and the editorial policy for how the calculators are built and checked.

Why this site exists

Reconstitution and dosage math is the same handful of division and multiplication steps every time, but it's easy to slip a decimal or mix up mg and mcg when doing it by hand. This site exists to do that arithmetic reliably and show its work, so the only judgment calls left are the ones you've already made — what dose, what compound, how much water — before you ever open the calculator.

Privacy by design

Every calculator runs client-side, in your browser. The numbers you type — peptide amount, water volume, dose — are never transmitted to a server or stored anywhere. There's no account to create, no form to submit, and nothing to opt out of, because nothing you enter leaves your device. See the privacy policy for the full detail, including the one non-tracking preference this site does store locally in your browser.

What's on this site

Beyond the main peptide calculator, there are dedicated reconstitution and dosage calculators, compound-specific pages for GLP-1, semaglutide, tirzepatide, BPC-157, MOTS-c, GHK-Cu, and DSIP, and the research chemistry tools listed above for molecular weight, molarity, extinction coefficient, and isoelectric point. Every compound-specific page uses the same underlying formulas as the main calculator — they exist to save you from re-entering a vial size or default water volume, not to change the math.

Questions or corrections

If a calculator gives a result that looks wrong, or something on this site is unclear, reach out through the contact page. Corrections to calculator logic are prioritized over everything else.