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Peptide reconstitution calculator

Enter your vial strength, the bacteriostatic water you add, and your target dose — get the exact draw in U‑100 insulin-syringe units and millilitres, with a clear flag when the draw looks out of range.

mg
mL
mg
Concentration2.50 mg/mL
Draw20 units · 0.20 mL
Draw check: within range

A calculator, not a prescription. Peptilot does the arithmetic on the numbers you enter — it never tells you what or how much to take.

How the math works

Reconstitution is two divisions. First, dissolving the lyophilized peptide sets the concentration: concentration (mg/mL) = peptide (mg) ÷ water (mL). Second, your draw follows from it: draw (mL) = dose (mg) ÷ concentration (mg/mL). A standard U‑100 insulin syringe maps 1 mL to 100 units, so the units reading is just the draw × 100.

Example: a 5 mg vial reconstituted with 2 mL of bacteriostatic water gives 2.5 mg/mL. A 0.25 mg dose is then 0.25 ÷ 2.5 = 0.1 mL — 10 units on the syringe.

This is the same pure, unit-tested module that ships in the Peptilot app, verified against canonical test vectors on every build — because dose math is the one place a tracker must never be sloppy.

Compound-specific calculators

Prefilled with commonly sold vial sizes:

Questions, answered.

How does peptide reconstitution math work?
Concentration = peptide (mg) ÷ bacteriostatic water (mL). Your draw volume = target dose (mg) ÷ concentration (mg/mL). On a standard U-100 insulin syringe, 1 mL equals 100 units, so units = mL × 100. The calculator does exactly this arithmetic — nothing more.
How much bacteriostatic water should I add?
Peptilot does not choose a diluent volume. The volume sets the concentration, so use the product instructions or the exact direction supplied by a qualified healthcare professional, then enter that number here. The calculator only converts the inputs you provide.
Why does the calculator warn about draws under 2 or over 100 units?
Draws under 2 units are hard to measure accurately on a standard insulin syringe, and draws over 100 units don't fit in one. The warning flags a likely input mistake or an impractical concentration — it is not dosing advice.
Is this calculator free? Do I need an account?
Yes, it's free, with no account and no signup. The same math runs inside the Peptilot app, where it's saved per vial so your draw is always one tap away.

Educational information for people who track their protocols — not medical advice, and never a recommendation to use any compound. Always work with a qualified healthcare provider.

In the Peptilot app, the calculator is saved per vial — your draw is one tap away every injection day.

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