Peptide Calculator
Dosage Tool

Peptide Reconstitution & Dosage Calculator

Work out concentration, units per dose, and total doses per vial. Enter your own values or start from a compound below.

Injectable
Storage & Stability

This tool provides general reconstitution math for reference only and is not medical or dosing advice. Body-weight ranges, frequency patterns, and storage notes reflect commonly cited reference information, not personalized recommendations — actual protocols vary by compound, goal, and individual. Always follow guidance from a qualified professional and the documentation provided with your product.

Result

Draw & dosing breakdown

Concentration0 mcg/mL
Per Unit0 mcg
Units to Draw0 units
Doses per Vial~0 doses

Peptide Calculator — Guide

Why Peptide Dosing Requires a Calculator

Peptides are sold by weight — 5 mg, 10 mg, 15 mg per vial. Insulin syringes are marked in units, where a 1 mL syringe holds 100 units. The bridge between the two is concentration, and concentration depends entirely on how much bacteriostatic water you add during reconstitution.

Add 2 mL of water to a 10 mg vial and you get 5 mg/mL. Add 1 mL instead and it doubles to 10 mg/mL — the same dose now needs half as many units to draw. Getting the water volume wrong doesn’t damage the peptide, but it does change every measurement that follows. This is where mental math becomes unreliable, and why the calculator handles the division for you.

What the Calculator Needs From You

Peptide selection — choose a compound from the dropdown to auto-fill typical vial size and dose, or start from Custom and enter your own numbers.

Vial amount and bac water — the mg on your vial label and the mL of bacteriostatic water you reconstituted it with. Together these set your concentration.

Dose entry — enter a manual mcg dose, or switch to body-weight mode to calculate from your weight (and lean body mass, if body fat % is provided) against a commonly cited reference range.

Syringe size — 30, 50, or 100 units, so the draw amount matches the markings on your actual syringe.

How the Result Is Displayed

The primary output is units to draw, shown large. Below it, a breakdown shows concentration, mcg per unit, and estimated doses per vial. If a compound has a commonly cited frequency or route, that’s shown too — and for oral or nasal compounds, the reconstitution math is skipped entirely since it doesn’t apply.

If a dose would require more units than your selected syringe holds, a warning flags it immediately rather than letting you draw past capacity.

Storage & Stability

Once reconstituted, most peptides are commonly cited as needing refrigeration and have a limited usable window — typically a few weeks. The calculator surfaces a storage note specific to your selected compound so this isn’t something you have to look up separately.

Frequently Asked Questions
How does the calculator determine units to draw?
It divides the peptide amount by the water volume to get concentration in mcg/mL, then divides your desired dose by that concentration and by mL-per-unit to convert into insulin syringe units.
Can I enter a dose in mg instead of mcg?
The tool works in mcg for precision. If your reference is in mg, multiply by 1,000 before entering (e.g. 0.5 mg = 500 mcg).
What does the body-weight range represent?
For compounds with a commonly cited mcg-per-kg range, the slider lets you select anywhere within that range based on your body weight (or lean body mass). It’s a reference figure, not a recommendation.
What happens if my dose exceeds syringe capacity?
A warning appears immediately, suggesting a larger syringe, a lower dose, or less dilution water.
Why do oral and nasal compounds look different?
Those routes aren’t reconstituted or drawn with a syringe, so the tool shows route, frequency, and storage guidance instead of draw math.
Where do the storage notes come from?
Each note reflects commonly cited handling for that compound. Always defer to the documentation provided with your specific product.