Reconstitution calculator
Vial mg + BAC water + target dose → exact units to draw. Free, no signup, same math as the iOS app.
Inputs
Semaglutide common vial sizes: 3 mg, 5 mg, 10 mg. Typical dose range: 0.25–2.4 mg. Public clinical dosing guidance. Not medical advice.
for a 0.25 mg dose
- Concentration
- 5.00 mg/ml
- Volume
- 0.050 ml
- Per ml
- 100 u
Not medical advice. Always verify against your vial label and your provider's instructions. Re-check before drawing.
How the math works
- 1. Concentration. Divide vial mg by BAC water ml to get mg per ml.
10 mg ÷ 2 ml = 5 mg/ml - 2. Volume. Divide your target dose by the concentration to get the volume to draw.
0.25 mg ÷ 5 mg/ml = 0.05 ml - 3. Units. Multiply the volume by the syringe's units per ml.
0.05 ml × 100 = 5 units (U-100)
Always verify. Decimal-place errors and mg-vs-mcg unit mistakes can produce dangerous results. Cross-check against your vial label and your provider's instructions before drawing.
Reconstitution FAQ
Answers, not hype.
Reconstitution is mixing a powdered peptide with bacteriostatic water (BAC) to make an injectable liquid. The math has three steps: concentration = vial mg ÷ BAC ml; volume to draw = dose mg ÷ concentration; units to draw = volume × syringe units per ml (100 for U-100, 50 for U-50, 40 for U-40).
A U-100 insulin syringe is calibrated so that 100 units equals 1 ml. It is the most common syringe used for peptide injections because the small unit graduations make precise dosing easier than reading 0.05 ml or 0.10 ml on a standard tuberculin syringe.
BAC water volume is your call — it does not change the dose, only the volume of liquid you draw. Common pairings are 1 ml or 2 ml for 5 mg vials and 2 ml or 3 ml for 10 mg vials. More water means a bigger volume and more units on the syringe; less water means a smaller volume and fewer units.
No. The typical dose ranges shown for each peptide are reference values pulled from public clinical or research literature. They are not personalized recommendations. Always follow your provider's protocol.
The web calculator solves one moment — the math. The iOS app keeps a history, runs reminders, advances multi-phase titration protocols, tracks injection sites with a body map, syncs to Apple Health, has a watch app and widgets, and exports a doctor-ready PDF. If you only need a one-off calculation, the web calculator is enough. If you are running a protocol over weeks or months, the app is a different category of tool.
Want history, reminders, and a doctor-ready PDF?
The iOS app turns this calculation into a living protocol — titration, body-map rotation, Apple Watch logging, weight & side-effect charts, and a polished PDF for your provider.