Peptide Dose Calculator
For a vial you've already mixed. Enter its strength, how much BAC water you added, your dose, and your syringe size. You get the exact number of units to draw and how many doses the vial will last.
Printed on the vial label or the product listing.
The amount you mixed into this vial. Haven't mixed it yet? Use the reconstitution calculator to pick an amount.
How it works
- 1 / 4Enter your vial strength (the milligrams printed on the vial) and how much BAC water you added to it.
- 2 / 4Enter the dose you want each injection, in mcg or mg.
- 3 / 4Pick your syringe: 100-unit (1 mL) or 30-unit (0.3 mL).
- 4 / 4Read how many units to draw per dose and how many doses the vial holds.
Questions
How do I know how many units to draw?
Units to draw depend on three things: your vial strength, how much bacteriostatic water you mixed it with, and your target dose. The calculator does the math and shows the exact line to pull the plunger to on your syringe.
What's the difference between mcg and mg?
1 mg equals 1,000 mcg. Peptides like BPC-157 and ipamorelin are usually dosed in mcg; GLP-1s like semaglutide and tirzepatide are usually dosed in mg. Pick the unit that matches your protocol or product label — getting it wrong changes your dose by 1,000x.
How many doses will my vial last?
Divide the total amount in the vial by your per-injection dose. A 5 mg vial dosed at 250 mcg gives 20 doses. The calculator shows this as 'doses per vial' so you know when to reorder.
Does my syringe size change the dose?
No. The dose is the same amount of peptide regardless of syringe. Syringe size only affects how many units that dose works out to and whether it fits. Both 100-unit and 30-unit insulin syringes use the same U-100 calibration, so 1 unit equals 0.01 mL on either.
Related calculators & guides
- CalculatorPeptide Stack Calculator: Mixing and Weekly ScheduleMix and schedule every peptide in your stack at once: BAC water, units to draw, and injection days for each vial, plus how long each one lasts.
- CalculatorUnits to mL Calculator: Insulin Syringe ConversionConvert insulin syringe units to mL and back (100 units = 1 mL), then find the exact units to draw for a peptide dose in mg or mcg.
- CalculatorPeptide Reconstitution CalculatorHow much BAC water to add and how many units to draw, one step at a time. The full mixing calculator.
- GuideHow to Reconstitute Peptides: Step-by-Step Mixing GuideHow to reconstitute peptides correctly: choosing your bacteriostatic water volume, working out dosage math, mixing without denaturing, and storing the reconstituted vial.
- GuideBacteriostatic Water for Peptides: A Practical GuideWhat bacteriostatic water is, how it differs from sterile water and saline, how much to use per peptide vial, and how to store it safely after opening.
This calculator is for informational purposes. Consult your prescribing provider for medical advice specific to your protocol.