Reconstitution calculator
mg → mL → syringe units. Free, no account needed.
Draw 5 units (0.05 mL) on a U-100 · 1 mL for a 250 mcg dose. Each vial gives about 40 doses.
Arithmetic based on the values you enter. Outputs do not determine a suitable dose or verify your inputs. Free account: save your protocol and log doses. Pro adds scheduled email reminders, inventory estimates, and trends — 7-day free trial. The calculator stays free forever.
How to use the calculator
- Enter the total peptide in your vial (e.g. 10 mg).
- Enter the bacteriostatic (BAC) water you are adding (e.g. 2 mL).
- Enter your desired dose per injection (e.g. 250 mcg).
- Review the calculated volume and U-100 syringe units. Outputs do not determine a suitable dose or verify your inputs.
Worked example
A 10 mg vial reconstituted with 2 mL of BAC water gives a concentration of 5 mg/mL. A 0.5 mg (500 mcg) dose is 0.1 mL — which is 10 units on a U-100 syringe, and about 20 doses per vial.
Common questions
What is a “unit” on an insulin syringe?
On a U-100 syringe, 100 units = 1 mL. So 10 units = 0.1 mL.
Why does my dose need more than 100 units?
Your concentration is too low for that dose in a single draw. Add more BAC water to lower the volume per dose, or split the dose.
Calculators by peptide
Pre-filled with common vial sizes and a worked example for the peptides people look up most:
Looking for a specific peptide? Browse the peptide library for profiles, storage, and typical research ranges.