Peptide Decoding
Three U-100 insulin syringes with teal liquid on a dark surface
Step 04 / Calculate a dose

Peptide calculator

Pick a compound. We'll show the reconstitution math, syringe draw, cost per dose, and how long a vial lasts.

Calculating for

Semaglutide

Only injectable compounds are listed; oral, nasal and topical compounds don't need mixing.

Printed on the vial.

Commonly referenced range: 0.25 up to 2.4 mg per week (start low, increase slowly)FDA label

iPeptide Decoding does not recommend a dose. Enter the amount your clinician gave you, or pick a value from the reference range to model.

Same dose, different draw. Pick whichever is easiest to measure.

mL waterCustom amount. Enter any volume, e.g. 10 mL.—units draw

Measuring the water1 mL = one full 100-unit syringe.

YOUR DRAW10 / 100 units
Read a syringe →

Multi-vendor comparison is a Pro feature.

Daily is 7. Twice weekly is 2.

Decoded

Your plan for Semaglutide

Dose
0.25 mg
Syringe draw
10units
Concentration
2.5mg/mL
Doses per vial
20

Nothing left over

Cost per dose
$2.95
Monthly cost
$12.82
Current supply lasts
4.6months
Reorder by
—
Planning tools in Pro →

Check why another calculator may disagree before comparing answers.

Want the dose people cite instead of the math? See the dosage chart.

This is one of the free tools on the site. See all tools.

Common questions

What does this calculator do?

It turns three numbers you enter, the milligrams in the vial, the water you add, and the dose you want, into the concentration, the syringe draw in units, and the cost per dose. It does arithmetic. It does not recommend a dose.

Mixing the vial itself, step by step: How to Reconstitute a Peptide.

Worked example?

A 5 mg vial with 2 mL of water is 2.5 mg per mL. A 250 mcg dose is 0.1 mL, which is 10 units on a 100-unit insulin syringe.

Does adding more water give me more drug?

No. The vial holds a fixed amount. More water spreads it thinner, so the same dose is a larger draw on the syringe.

Which amount to pick: How Much Water Do I Add to a Peptide?

What syringe does it assume?

A U-100 insulin syringe, where 100 units is 1 mL. If your syringe is different, use the mL figure instead of the units figure.

Where does the "reference range" come from?

From the drug label, a published trial, or community practice, and it is labeled with which. It is the range a source used, not a recommendation. Talk to a licensed clinician before using any substance.