Free tool
Reconstitution calculator
Pick your peptide, vial size, and BAC water. Get exact units to draw on a 1 mL insulin syringe, with documented dose ranges and a one-click add-to-stack.
Educational reconstitution math reference only. This tool does not provide dosage or usage recommendations. Consult a qualified healthcare provider before making any health decisions.
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Pick your peptide
Type to search, or pick from the dropdown. Auto-fills the recommended vial size and dose tier.
Your mix
What you mixed
5 mg powder + 2 mL water
Concentration of the liquid
250 mcg per 10 units
Each small line on a 1 mL insulin syringe = 25 mcg
One 5 mg vial lasts you
20days≈ 2.9 weeks
At 250 mcg, 1 dose / day, 20 total doses in this vial.
Insulin syringe, draw to the 10 unit mark10 u
Pull the plunger back until the rubber stopper lines up with the 10 mark on the barrel. The red liquid in the picture is the peptide volume.
ⓘ Syringe unit referenceFull guide →
- • Standard insulin syringe = 100 units total
- • Small markings = 1 unit each
- • Large markings = 10 units (0.1 mL)
- • 100 units = 1 mL
Always verify reconstitution math against a second source before any dose you actually inject.
Per-drug reconstitution calculators
Each one prefills the common vial sizes for that compound and shows the units-to-mg math.
Weight loss (GLP-1)
Healing & recovery
Skin & metabolic
Reconstitution calculator FAQ
- How do you calculate peptide dose in insulin syringe units?
- Reconstitute the vial with bacteriostatic water, then work from the concentration. Concentration equals total peptide (mcg) divided by water added (mL). On a 1 mL (100-unit) insulin syringe, units to draw equals your dose in mcg divided by the concentration, times 100. The calculator does this from your vial mg, water mL, and dose.
- How much bacteriostatic water do I add to a peptide vial?
- There is no single correct amount. More water gives a more dilute mix and a larger, easier-to-read draw; less water gives a smaller draw. Common choices are 1 to 5 mL. The calculator shows the resulting concentration and syringe units for whatever amount you pick, so you can choose a volume that lands at a readable draw.
- How do I convert mg to insulin units for semaglutide or tirzepatide?
- Milligrams describe the dry powder in the vial; insulin units describe the volume drawn on the syringe, so there is no fixed conversion without knowing how much water you mixed. Enter the vial mg, the water mL, and your dose, and the calculator returns the exact units to draw.
- Is the Pepdex calculator free?
- Yes. The reconstitution and dose math is completely free with no account needed. A free account adds saving your protocol plus a 3-day trial of the AI Coach and Personal Stack.