Reconstitution Calculator

A unit-conversion tool for translating a vial size, dilution volume, and dose you've already determined into a syringe measurement.

Total peptide amount in the vial (mg)

Vial sizes vary significantly between vendors and compounding pharmacies. Use the exact amount printed on your specific vial's label, never a general assumption or a number from a different product.

Diluent (bacteriostatic or sterile water) volume added (mL)

This assumes you are adding a fixed, known volume of diluent. The correct volume depends on your specific product and intended use. Follow your source's reconstitution instructions or your own research, not a default value.

Desired dose

This calculator does not recommend or suggest a dose of any kind. Enter only a dose you have already determined through your own research, a licensed prescriber, or your pharmacy's specific instructions. Doses are commonly written in either mcg or mg depending on the compound and source. Double-check which unit your own dose is expressed in before selecting one here, since choosing the wrong unit will produce an incorrect result.

Syringe / needle type

Syringe markings vary by manufacturer and type, and misreading them is a common real-world source of dosing error. Confirm your own syringe's actual markings before drawing any amount. The options below reflect common, but not universal, syringe specifications.

Enter a vial amount, diluent volume, and dose above to see a result.

The fields above stay disabled because this tool needs JavaScript. The arithmetic is short enough to do by hand: divide the vial amount in mg by the diluent volume in mL, then multiply by 1000, which gives the concentration in mcg/mL. Divide your dose in mcg by that concentration and you have the volume to draw in mL. Multiply that volume by 100 for a U-100 insulin syringe or a 1 mL tuberculin syringe, by 40 for a U-40, or by 10 for a 3 mL syringe.

🔬 This is an illustrative example, not a dosing tool. It performs arithmetic only: it does not recommend, suggest, or validate a dose, a vial size, or a dilution volume. Every number above must come from your own research, your prescriber, or your pharmacy's instructions. Nothing here is medical advice.

⚠️ This tool cannot verify that any of your inputs are correct, safe, or appropriate. It has no way to know your actual vial's true contents, whether your syringe matches the type selected, or whether the dose entered is reasonable for any compound, person, or purpose. Errors in reconstitution and dosing can cause real harm. Always confirm your specific product, equipment, and dose with a qualified healthcare professional or your pharmacy before administering anything.