Free tool

Peptide reconstitution calculator

Convert the numbers already on your vial and in your protocol — powder amount, bacteriostatic water, and your dose — into concentration, syringe units, and doses per vial. Every field starts empty: you bring the numbers, the calculator does the arithmetic.

Research & educational use · Not medical advice.

Your numbers

Peptide in vial

Bacteriostatic water added

Your dose

Syringe standard

Barrel size

Results

You'd draw (U-100)—

Concentration—

Volume per dose—

Doses per vial—

Research & educational use · Not medical advice.

This calculator only converts numbers you already have. It does not suggest, validate, or endorse any dose, compound, or protocol.

How the math works

Three conversions, nothing more

01 · Concentration

mg ÷ mL

Dissolving a known amount of powder in a known volume of water gives a concentration. 5 mg of powder in 2 mL of water is 2.5 mg/mL — the powder is simply spread evenly through the liquid.

02 · Volume

dose ÷ concentration

A dose is a fraction of the vial, so it is the same fraction of the liquid. At 2.5 mg/mL, a 250 mcg (0.25 mg) dose corresponds to 0.1 mL of solution.

03 · Units

mL × syringe scale

Insulin syringes mark volume in units. On a U-100 syringe, 1 mL = 100 units, so 0.1 mL reads as 10 units. The same 5 mg vial holds 20 such 250 mcg doses (5000 ÷ 250).

These are statements of arithmetic, not instructions. The calculator never checks whether a number is typical, safe, or appropriate — it only converts between the units you enter.

The same math lives in the app

PeptideMax keeps your reconstitution math next to your schedule, dose log, and site rotation — on-device, with the identical formulas used on this page. Get PeptideMax on the App Store.

Research & educational use · Not medical advice.

This calculator only converts numbers the user already has and does not suggest, validate, or endorse any dose, compound, or protocol. Nothing on this page is a recommendation to use any substance. Consult a qualified healthcare professional before making any health-related decision.