Peptide Calculator

The Protocol Pack

Twenty-five pages, written to be printed and kept next to the vial. Free.

It is 11pm. You have just realised you put 3 mL of bacteriostatic water into a vial you meant to reconstitute with 2. Or you shook it instead of swirling it, and there is a head of foam on top. Or you drew 40 units when the number in your head was 20, and it is already in you.

Every calculator online answers the question you had before you started. None of them answer that one. Nine of these pages do.

No account, no spam, unsubscribe in one click. I email rarely and only about this subject.

What is in it

Part one · Getting it right

Part two · When it goes wrong

Five pages. What actually happened, whether it matters, what to do, and the point at which it stops being a maths problem and becomes a phone call.

You did thisThe pack tells you
Added too much or too little waterHow to recalculate instead of discarding
Do not know how much you addedThe one honest way to recover the vial
Shook it instead of swirlingWhen it is fine, and when the vial is finished
Left it out of the fridgeOvernight versus days, powder versus solution
Froze it, or it looks cloudyWhat is recoverable and what is not
Injected more than you meant toHow to size it, and the symptoms that mean go now
Cannot remember whether you dosedHow to settle it from the vial itself
Missed a weekly dose, or severalCatch up, skip, or step back down the ladder

Part three · Print and keep

Why is it free

Because it is worth more to me that you have it. This site earns from affiliate links on one clearly marked page, and from nothing else. A reference document that stops someone binning a good vial, or taking a dose they did not mean to, is the best possible argument that the rest of the site is worth trusting.

What it is not

It is not a protocol in the sense of telling you what to take. It contains no dose recommendations, because that is not a thing a document can responsibly do. Dose ranges in it describe what is commonly reported, and the pack says plainly where a compound has never been properly characterised instead of inventing a number. It is a reference for arithmetic and handling, and everything in it assumes you have already made your own decisions with a clinician.

Calculators by compound

RetatrutideVial, water and weekly dose to syringe unitsTirzepatideThe 2.5 to 15 mg ladder, convertedSemaglutideThe 0.25 to 2.4 mg ladder, convertedBPC-157mcg doses from a 5 or 10 mg vialReconstitutionHow much water to add, and why it mattersDosing chartsPrintable unit tables for every compoundTitration schedulesFull ladders with units at every stepReading a syringeU-100 vs U-40, and the 2.5x errorHow much water?Pick a volume that lands where you can read it
Read this before you use the numbers. This is a unit-conversion tool. It converts a vial strength and a volume of bacteriostatic water into a concentration, a draw volume and a mark on an insulin syringe. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most of the compounds listed here are sold for laboratory research use and are not approved for human use. Nothing on this site is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always confirm the strength printed on your own vial rather than trusting a preset.