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Peptide Reconstitution Calculator
Convert vial size, bacteriostatic water volume and target dose into the exact insulin-syringe units to draw — with a live syringe preview. Everything runs in your browser.
Reconstitution calculator
Enter your vial, diluent and target dose — the syringe updates live.
Toggling converts the value between micrograms and milligrams.
U-100 Insulin Syringe (100 units)
20.0 units
Dosing instructions
For a dose of 500 mcg, draw the syringe to 20 units.
- Concentration
- 2.5 mg/ml
- Volume to draw
- 0.2 ml
- Syringe units
- 20 / 100
- Syringe type
- U-100 insulin
How the Math Works
The calculator applies three simple conversions — the same ones you can verify by hand:
1. Concentration
Peptide quantity (mg) ÷ bacteriostatic water (ml) = concentration in mg/ml. A 5 mg vial with 2 ml of water is 2.5 mg/ml.
2. Volume per dose
Desired dose (mg) ÷ concentration (mg/ml) = volume to draw in ml. A 500 mcg (0.5 mg) dose at 2.5 mg/ml is 0.2 ml.
3. Syringe units
Volume (ml) × 100 = units on a U-100 insulin syringe. 0.2 ml equals the 20-unit mark.
Understanding the Inputs
- Peptide quantity
- The total amount of lyophilized peptide in your vial, in milligrams (mg) — printed on the vial label.
- Bacteriostatic water
- The volume of diluent you add to reconstitute the peptide, in milliliters (ml). This sets the concentration.
- Desired dose
- The amount of peptide per administration, in micrograms (mcg) or milligrams (mg) — the toggle converts between the two.
- Syringe volume
- The size of your U-100 insulin syringe (0.3, 0.5 or 1.0 ml), which sets the maximum draw and the tick spacing.