Free Peptide Reconstitution Calculator
Convert mg to insulin units instantly for any peptide. Visual 0.3 / 0.5 / 1.0 mL syringe draw-line previews included.
Peptide dose calculator for any vial
Enter vial strength in mg, the volume of bacteriostatic water you added, and your target dose. The calculator returns the exact draw volume in mL and the equivalent insulin-syringe units, with visual previews for 0.3 mL, 0.5 mL and 1.0 mL syringes.
Works with tirzepatide, semaglutide and research peptides
The same math applies to tirzepatide, semaglutide, retatrutide, BPC-157, TB-500, CJC-1295, ipamorelin, tesamorelin and any custom vial. Preset vial strengths cover the common 5 mg, 10 mg, 15 mg and 30 mg presentations.
Double-check before every injection
Re-run the calculation whenever you change vial strength or reconstitution volume — the most common dosing error is carrying over units from a previous vial with a different concentration.
Frequently asked questions
Which syringe should I use?
Use the smallest syringe that fits your draw volume. A 0.3 mL (30-unit) syringe gives the most accurate small doses; a 0.5 mL syringe covers most weekly GLP-1 protocols.
Does the calculator work for tirzepatide?
Yes — enter the vial strength (commonly 10 mg, 15 mg or 30 mg), your BAC water volume and the target mg dose to get units.
Do I need an account?
No. The calculator runs entirely in your browser and requires no signup.