Peptide dosage calculator
250 → 500 → 1000 → 1700 → 2400 mcg, 4 weeks per tier, once weekly.
Frequency for this schedule: 1× per week. Values default to the reference configuration until you enter your own.
Schedule
| Tier | Weeks | Dose | Draw (mL) | U-100 units |
|---|---|---|---|---|
| 1 | 1–4 | 250 mcg | 0.1 | 10 |
| 2 | 5–8 | 500 mcg | 0.2 | 20 |
| 3 | 9–12 | 1 mg | 0.4 | 40 |
| 4 | 13–16 | 1.7 mg | 0.68 | 68 |
| 5 | 17–20 | 2.4 mg | 0.96 | 96 |
How the arithmetic works
Three steps, and every calculator that claims otherwise is doing the same thing with more decoration:
- Concentration = vial mass ÷ diluent volume. A 5 mg vial with 2 mL gives 2.5 mg/mL.
- Draw volume = dose ÷ concentration. A 1 mg dose at 2.5 mg/mL is 0.4 mL.
- Syringe units = draw volume × units marked per mL. 0.4 mL on a U-100 barrel is 40 units.
The concentration is the only variable under your control after the vial is filled, which is why two clinics can dispense an identical dose and count different units. Always convert against the label in front of you — the syringe guide covers what happens when the barrel is not U-100.
Common questions
How do I convert a peptide dose in mcg to syringe units?
Divide the vial mass by the diluent volume to get the concentration, divide the dose by that concentration to get the draw volume in mL, then multiply by the units marked per mL on the barrel — 100 for a standard U-100 insulin syringe.
Does the diluent volume change the dose?
No. It changes the concentration, and therefore the number of units drawn for the same dose. More diluent means more units for an identical amount of drug, which is often how a very small dose is made measurable.
What if the calculated draw exceeds the syringe?
Reconstitute with less diluent to raise the concentration, use a larger barrel, or split the dose. Never assume a draw beyond the last graduation is accurate.