Peptide Dose Calculator
Enter your vial strength, the dose you want per injection, and your syringe size. You get the exact number of units to draw and how many doses the vial will last.
Step 1 · Vial strength
This is printed on your vial or the product listing. Common amounts are 2mg, 5mg, and 10mg.
How it works
- Enter your vial strength — the milligrams printed on the vial.
- Enter the dose you want each injection, in mcg or mg.
- Pick your syringe: 100-unit (1 mL) or 30-unit (0.3 mL).
- Read how many units to draw per dose and how many doses the vial holds.
Frequently asked 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.
Track your protocol in DoneDose
DoneDose logs your doses, tracks serum levels over time, and reminds you when to inject next.
Related calculators & guides
This calculator is for informational purposes. Consult your prescribing provider for medical advice specific to your protocol. DoneDose does not provide medical advice.