Reconstitute Peptides the Right Way
A free peptide reconstitution calculator that gives you the exact mg, mL, and syringe units — plus a printable dosage chart, every time.
Start ReconstitutingFor informational and research calculation purposes only. This tool does not provide medical advice, treatment recommendations, or individualized dosing instructions.
Three values, one clear result
Vial amount
The total peptide quantity printed on the vial, in milligrams or micrograms.
Liquid added
How much BAC water (or other diluent) you mixed in — this is what sets the concentration.
Amount to measure
The amount you provide, converted into a liquid volume and a syringe mark you can read directly.
Three steps to your number
Enter your numbers
Vial amount, liquid added, and how much you want to draw up.
See the math
Your concentration and exact syringe mark, laid out clearly — check it yourself, no black box.
Save or print your chart
Keep a QR-coded copy or a printable PDF dosage chart for next time, so you're not redoing the math.
Jump to your peptide
What is bacteriostatic water?
Bacteriostatic water is sterile water with a small amount of preservative added, which is what lets a mixed vial be used more than once instead of all at once. Whether it's the right diluent for a given compound depends on that compound's own instructions — it isn't a universal substitute.
Storage time, mixing ratios, and handling can all vary by compound. When in doubt, follow the product's own labeling.
The preservative concentration typically used in bacteriostatic water. It's not appropriate for every compound or every situation.
New to this? Here's the math behind it
Pick your peptide, tell us what's on the vial label, and how much liquid you mixed in. We'll do the division for you and show exactly how much is in every mL.
Browse the peptide & compound libraryWhy mg, mcg, and units are all different
Vials are usually labeled in mg, but most syringes are marked in units on a 1 mL, 100-unit scale — so a straight mg reading doesn't tell you where to draw the plunger to. This calculator bridges that gap: 1 mg = 1,000 mcg, and on a standard syringe, 1 mL = 100 units.
What "concentration" actually means here
BAC water (bacteriostatic water) is just the liquid you mix into the vial. Once it's in, the math is one simple division: what's on the vial, divided by how much liquid you added. We show you that number so you can double-check it yourself — nothing hidden.
What this tool doesn't do
This tool only does the arithmetic on the numbers you enter — it doesn't tell you what amount to use, how often, or how to administer anything. That decision, and the numbers behind it, stay entirely yours.
Calculators and reconstitution guides
Open a compound-labeled calculator, or learn the terminology and math behind the results.
Peptide & compound library
Browse compound-labeled reconstitution calculators as they're added.
Browse the library → 02Understand the math
Learn the concentration, liquid-volume, and unit-conversion formulas in plain English.
Read the guide → 03About this project
Why this calculator exists and what it will and won't do.
Read more →