Peptides AcademyPeptide Dose Calculator
Convert a milligram dose into exact insulin-syringe units in a second. Enter the peptide content per vial, the volume of bacteriostatic water you're reconstituting with, and your target dose — we return the draw volume and the units on a U-100 syringe.
Inputs
The total mg of peptide in the lyophilized vial (e.g., 5 mg).
Volume of BAC water used for reconstitution. Common: 1, 2, or 3 mL.
Desired per-injection dose.
Quick Presets
Result
Draw on U-100 syringe
10units
= 0.1 mL draw volume
Concentration
2.5 mg/mL
After reconstitution
Units per mg
40
On U-100 syringe
Dose
250 mcg
0.25 mg per injection
Doses per vial
20
Approximate
Reference tool for educational purposes. Always verify calculations independently and consult a qualified medical professional before any self-administration.
How the math works
On a standard U-100 insulin syringe, 1 mL = 100 units. The calculator divides your target dose by the reconstituted concentration (mg/mL) to produce the draw volume, then multiplies by 100 to convert to units. For an extended walk-through — including how concentration choice affects injection volume — see the reconstitution tutorial.
Pre-filled for your peptide
Skip the setup. Each per-peptide calculator is pre-filled with the standard vial size, typical concentration, and conventional dose range.
Common calculator questions
What does a peptide calculator actually calculate?
It converts a target peptide dose (in mg or mcg) into the exact number of units to draw on a U-100 insulin syringe, given the reconstituted concentration of your vial. The math is: draw volume in mL = dose in mg ÷ concentration in mg/mL. Multiplying by 100 converts mL to units on a U-100 syringe.
What is a U-100 insulin syringe?
U-100 means 1 mL equals 100 "units" on the syringe scale. This calibration was designed for insulin (U-100 insulin = 100 International Units per mL) and is now the de facto standard for peptide self-administration because it allows precise measurement of small volumes.
How much bacteriostatic water should I use?
Common choices are 1 mL, 2 mL, or 2.5 mL per standard 5 mg vial. More water means a more diluted solution and a larger draw volume per dose — useful when doses are small and precision matters. Less water means a more concentrated solution and smaller draws — useful when draw volume is awkwardly large.
Why does the calculator have peptide presets?
Each peptide has conventional vial sizes and typical per-injection doses. Starting from the preset saves time and reduces the chance of an order-of-magnitude dosing error. You can still adjust any value — the preset is just a sensible starting point.
Is the calculator result medical advice?
No. The calculator performs arithmetic. Whether a particular dose is appropriate for your situation is a clinical question that requires evaluation by a qualified medical professional. Many peptides referenced are research-use-only in most jurisdictions.
What if my dose requires more than 100 units?
One 1-mL U-100 syringe holds exactly 100 units. If your dose exceeds that, either (a) use more bacteriostatic water for reconstitution — raising concentration reduces draw volume, or (b) split the dose into two injections. The calculator flags doses over 100 units.
Does the calculator work for GLP-1 pens (Ozempic, Mounjaro)?
It is not designed for proprietary pens, which are pre-dosed by the manufacturer. Use the calculator for reconstituted peptides administered by insulin syringe or a refillable multi-dose pen. See the peptide-pen guide for pen-specific dosing.
Why convert mcg to mg?
1 mg = 1000 mcg. Research peptide dosing is often specified in mcg (e.g., "250 mcg BPC-157") while vial content is labeled in mg (e.g., "5 mg vial"). The calculator handles the conversion automatically — use the mcg/mg toggle to enter dose in your preferred unit.