# Peptide Reconstitution Calculator: mg to Units on a Syringe

> Free peptide reconstitution calculator. Vial mg + bacteriostatic water mL + your dose -> units to draw on a U-100 insulin syringe, concentration and doses per vial. 82 compounds prefilled.

Source: https://peppytracker.com/calculator/
Last updated: 2026-09-02

Units on a U-100 syringe = (dose in mg ÷ (vial mg ÷ water mL)) x 100. Example: 5 mg vial, 2 mL water, 250 mcg dose = 10 units.

Interactive calculator: https://peppytracker.com/calculator/

## Frequently asked

### How do you calculate peptide reconstitution?

Concentration = peptide in the vial (mg) ÷ water added (mL). Volume to draw = dose (mg) ÷ concentration. Units on a U-100 insulin syringe = volume in mL x 100. Example: 5 mg in 2 mL is 2.5 mg/mL; a 250 mcg dose is 0.1 mL, which is 10 units.

### How many units are in 1 mL?

A U-100 insulin syringe has 100 units per mL, so 1 unit is 0.01 mL. A 0.5 mL syringe holds 50 units, a 0.3 mL syringe holds 30.

### What if the dose is more than 100 units?

It will not fit a 1 mL syringe in one draw. Reconstitute with less water so the same dose takes fewer units, or ask your prescriber. The calculator warns you when this happens.

### Is this the same as the calculator in the Peppy app?

Same math. In Peppy it lives inside the protocol editor, so the units to draw show on the Today tab and in the Log shot sheet every time, and it also runs standalone from Settings.

### Does the calculator tell me what dose to take?

No. It converts a dose your prescriber set into units on a syringe. It is a mathematical conversion only. Always verify each draw-up yourself.

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Peppy is a tracking tool, not medical advice. Dose calculations are mathematical conversions only. Always follow your prescriber's instructions and verify every draw-up yourself.

Peppy is a free iPhone app (Pro subscription optional). App Store: https://apps.apple.com/us/app/peptide-tracker-peppy/id6775005514