Calculator
Vial to syringe, worked out for you.
This tool does one job: arithmetic. Tell it how much peptide is in your vial, how much diluent you added, and the dose your prescriber told you to take — it converts that into a concentration, a draw volume, and where that volume lands on a standard insulin syringe. It does not tell you what dose to take. That number always comes from your prescriber, typed in by you.
Math, not medical advice
Every number this calculator outputs is basic division: milligrams divided by milliliters, and milliliters multiplied by 100 to read as insulin-syringe units. It never suggests a starting dose, a “typical” amount, or a titration schedule — those fields are things you type in, never something the tool assumes for you. Where a molecule page below shows an FDA-approved product's labeled dose strengths, that is presented as what the brand-name label states, not as guidance for what a compounded dose should be.
What you get
Resulting concentration in mg/mL, the exact volume to draw in mL, that volume read as units on a standard U-100 insulin syringe, and a visual syringe barrel with the fill line marked — so you can check your work before you draw anything up, not just read a number off a form.
Choose a compound
Each page below mounts the same calculator engine, with reference context specific to that compound and a link to how we rank the providers that sell it.
Reconstitution calculator
Tirzepatide
Convert a compounded tirzepatide vial and your prescribed dose into a syringe reading.
Open calculatorReconstitution calculator
Sermorelin
Convert a compounded sermorelin vial and your prescribed dose into a syringe reading.
Open calculatorReconstitution calculator
Retatrutide
Vial-to-syringe arithmetic for retatrutide — an investigational compound with no FDA-approved product or established dosing standard.
Open calculator
Medical disclaimer: This content is for general educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a licensed healthcare professional before starting, stopping, or changing any treatment.