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Peptide reconstitution calculator.
Enter your vial size, bacteriostatic water, and target dose. Get the exact concentration, the volume to draw in mL, and the units on a U-100 syringe. No rounding, no account, and the full math is shown every time.
Units shown for a U-100 insulin syringe (1 mL = 100 units). No rounding · the full math is above.
How the math works
Three steps, no hand-waving.
Reconstitution is simple arithmetic. The only thing that matters is that it is exact, and that you can see every step.
Vial mg ÷ BAC water mL = mg/mL. A 5 mg vial in 2 mL of water is 2.5000 mg/mL.
Target dose in mg ÷ concentration = mL to draw. 0.25 mg ÷ 2.5 mg/mL = 0.1000 mL.
Draw mL × 100 = units on a U-100 insulin syringe. 0.10 mL = 10 units.
Compound-specific calculators
Same math, tuned per compound.
Pre-filled for the compound you're running, with the reconstitution context for each.
Stop recalculating
Regimio does this for every dose, automatically.
This calculator is the same engine that ships inside the Regimio app, embedded in the dose logger. The app remembers your vial, counts down the 28-day BAC water window, and shows the draw the moment you log.
- Reconstitution built into the logger, not a separate tool
- 28-day BAC water expiry countdown per vial
- Doses remaining and refill warnings, all derived
- Local-first · no account, data stays on your device
FAQ
Reconstitution questions, answered.
How do you calculate peptide reconstitution?
Divide the peptide mass in the vial by the volume of bacteriostatic water you add to get the concentration in mg/mL. Then divide your target dose (converted to mg) by that concentration to get the volume to draw in mL. Multiply that volume by 100 for units on a U-100 insulin syringe.
How much BAC water should I add to a peptide vial?
Mathematically any volume works. More water gives a larger, easier-to-measure draw; less water gives a smaller draw. Common choices are 1 to 5 mL. The calculator updates the draw instantly, so you can pick a water amount that lands on an easy-to-read number of units. This is reconstitution math, not dosing advice.
How many units is my dose on an insulin syringe?
On a U-100 insulin syringe, 1 mL equals 100 units. So units = draw volume in mL times 100. A 0.10 mL draw is 10 units.
What concentration will my vial be after reconstitution?
Concentration in mg/mL equals the peptide mg in the vial divided by the mL of BAC water added. A 5 mg vial with 2 mL of water is 2.5 mg/mL.
Does the dose unit matter, mcg vs mg?
Yes. 1 mg equals 1000 mcg. The calculator converts your dose to mg before solving, so enter the unit your protocol uses and it handles the conversion for you.
This tool performs reconstitution arithmetic only. It is not medical advice and does not recommend any dose. Always follow guidance from a qualified provider. See our medical disclaimer.