Peptide Reconstitution & Dosage Calculator

It converts the three values every researcher needs — vial size (mg), bacteriostatic water added (mL), and target dose per aliquot (mcg or mg) — into the exact number of syringe units to draw. This removes the manual arithmetic error that's the most common source of measurement mistakes in peptide research.

Concentration is vial mass divided by BAC water volume. Volume per dose is target dose divided by concentration. Syringe units are that volume scaled to the syringe markings — a 1 mL insulin syringe is graduated into 100 units, so 0.1 mL = 10 units. The calculator does all three steps and shows the intermediate concentration so you can verify it.

1 mL (100 unit) insulin syringes are the most common choice in peptide research because the 100-unit scale gives single-unit precision for typical sub-millilitre doses. 0.5 mL (50 unit) and 0.3 mL (30 unit) syringes give finer resolution for very small doses. Choose the smallest syringe that comfortably fits your dose volume without overdrawing.

Most researchers reconstitute a 10 mg peptide vial with 1–2 mL of bacteriostatic water. More water means a lower concentration and a larger volume to draw per aliquot, which improves measurement accuracy but increases the volume drawn. Stronger concentrations (less water) are useful when target amounts are large.

No — the math is purely volumetric. The presets pre-fill commonly used research starting values for popular peptides — including Retatrutide, BPC-157, GHK-Cu, Semax, and Melanotan II — but they are not protocol recommendations. Your reconstitution volume, dose, and frequency should follow your own research protocol or the published literature for the compound.

Reconstituted peptide solutions are typically stable for 28 days when stored at 2–8°C (refrigerated) and prepared with bacteriostatic water (which contains 0.9% benzyl alcohol as a preservative). Lyophilised vials remain stable for up to 24 months at -20°C. See our Peptide Storage Guide for full guidance.

Doses per vial equals the vial size divided by the dose per aliquot. For example, a 10 mg vial drawn at 250 mcg per aliquot yields 40 doses (10 mg = 10,000 mcg; 10,000 ÷ 250 = 40). The calculator shows doses-per-vial automatically alongside the syringe units so you can plan how long a vial will last and cross-check the maths.

1 mg (milligram) equals 1,000 mcg (micrograms). Peptide vials are usually labelled in mg (e.g. a 10 mg vial), while research doses are often expressed in mcg (e.g. 250 mcg). Mixing the two up is the most common reconstitution error — the calculator lets you select mcg or mg for the target dose so the conversion is handled for you.

The arithmetic itself is simple, but a single decimal-place or mcg/mg slip changes the drawn volume by an order of magnitude. A calculator removes that error, shows the intermediate concentration so you can verify the result, and instantly re-runs the maths when you change the BAC water volume or syringe size — which is why it's the most-used research utility on the site.

Yes — the peptide calculator is completely free, requires no sign-up, and runs entirely in your browser on desktop and mobile. Nothing you enter is stored or sent anywhere. It is provided by Peptide Warehouse Australia as a research aid for in-vitro laboratory use only.