How to Use a Peptide Dosage Calculator (Step by Step)
A peptide dosage calculator removes the guesswork from research dosing. Instead of working out concentrations by hand, you enter the vial size, the amount of water you added, and the dose you want, and the tool returns the exact volume to draw. This guide walks through the math it does and how to read the result.
The three numbers you need
Every reconstitution calculation comes down to three inputs. Get these right and the rest is arithmetic.
- Peptide amount: the milligrams of peptide in the vial, printed on the label (for example 5 mg or 10 mg).
- Bacteriostatic water: the millilitres of water you add to the vial to dissolve the powder.
- Target dose: the amount you want per administration, usually in micrograms (mcg).
The math, step by step
First the calculator finds concentration. If you add 2 ml of water to a 5 mg vial, that is 5000 mcg divided by 2 ml, which equals 2500 mcg per ml. Then it divides your target dose by that concentration. A 250 mcg dose at 2500 mcg/ml needs 0.1 ml, which is 10 units on a standard 100 unit insulin syringe.
| Input | Example |
|---|---|
| Vial | 5 mg (5000 mcg) |
| Water added | 2 ml |
| Concentration | 2500 mcg/ml |
| Target dose | 250 mcg |
| Volume to draw | 0.1 ml (10 units) |
Reading insulin syringe units
Most research dosing uses insulin syringes marked in units, where 100 units equals 1 ml. So 0.1 ml is 10 units and 0.05 ml is 5 units. The calculator on this site converts to units for you so you do not have to translate ml by eye. Our dosage calculator shows both ml and units side by side.
Common mistakes
The two errors that ruin accuracy are confusing milligrams with micrograms, and forgetting that the concentration changes if you add a different water volume than planned. Always recalculate if you change the water amount. If you are new to a compound such as BPC-157, run the numbers before you draw anything.