Peptide Reconstitution & Dosage Calculator
Bacteriostatic Water & U-100 Scale Units
Use this peptide reconstitution calculator for arithmetic from values you already have. Convert a vial amount, bacteriostatic water volume, and target dose into concentration, milliliters, and a U-100 syringe scale position.
Calculate the syringe position
Enter the vial amount, bacteriostatic water volume, and target dose to see the exact U-100 scale position.
How the peptide calculation works
The calculator first finds concentration, then converts the entered target amount into liquid volume. A U-100 scale has 100 scale units per milliliter, so the final volume is multiplied by 100.
1. Concentration
Peptide in vial (mg) ÷ final mixed volume (mL) = mg/mL.
2. Volume
Target dose (mg) ÷ concentration (mg/mL) = mL per dose.
3. U-100 scale
Volume (mL) × 100 = position on a U-100 syringe scale.
Why final mixed volume matters
Enter the bacteriostatic water volume stated in your mixing instructions. The calculator treats that number as the final mixed volume when calculating concentration. Added liquid and final mixed volume are not guaranteed to be identical, so confirm the product-specific resulting concentration or preparation directions.
Follow the product-specific directions and confirm compatibility rather than using this calculator to choose a diluent or preparation volume.
U-100 capacity and syringe line spacing
Barrel capacity
A 0.3 mL U-100 barrel has a capacity of 30 scale units, a 0.5 mL barrel has a capacity of 50 scale units, and a 1 mL barrel has a capacity of 100 scale units. Changing the selected barrel does not change the calculated volume.
Smallest line
Syringe graduations vary. Enter the smallest interval printed on the syringe so the calculator can flag a result that lies below the first line or between lines. It will not round that result.
Illustrative calculation example
This example demonstrates the formula only. It is not a dose, product, or preparation recommendation.
With 5 mg in the vial and 2 mL entered as the bacteriostatic water volume, the calculator treats the mixed volume as 2 mL and returns a concentration of 2.5 mg/mL. A user-entered target of 250 mcg equals 0.25 mg. Dividing 0.25 mg by 2.5 mg/mL gives 0.1 mL, which corresponds to 10 scale units on a U-100 scale.
Research and unapproved peptide limitations
A mathematically correct conversion cannot establish what a vial contains or whether it is appropriate to use. This calculator cannot authenticate a product or evaluate purity, potency, contamination, sterility, storage, compatibility, or regulatory status.
“Research use only” wording is not evidence that a product is suitable for human use. Do not treat the output as authorization or medical guidance.
Frequently Asked Questions
Common questions about concentration, bacteriostatic water, and U-100 syringe scales
What does the peptide dosage calculator calculate?
It converts the vial amount, bacteriostatic water volume, and target dose you enter into concentration, liquid volume, and a U-100 syringe scale position.
Can this calculator tell me how much bacteriostatic water to add?
No. Enter the bacteriostatic water volume stated in your mixing instructions. The calculator treats that number as the final mixed volume; it does not choose a preparation volume.
How many U-100 scale units equal 1 mL?
On a U-100-labeled syringe, 1 mL corresponds to the 100-unit scale position. These scale units are not peptide milligrams or biological IU.
Does syringe size change the calculated dose or volume?
No. Selecting a 0.3, 0.5, or 1 mL U-100 syringe changes only the displayed capacity and whether the calculated volume fits.
What happens when the result falls between syringe lines?
The calculator shows the unrounded position and a warning. It does not round to a nearby line or suggest a different syringe or preparation.
Can this tool recommend a dose or confirm that a peptide is safe?
No. It performs arithmetic only and cannot recommend a dose or verify product approval, identity, quality, sterility, compatibility, or suitability for human use.
Data Sources
The formulas are dimensional arithmetic. These official references support the safety and labeling context used on this page:
- FDA compounded-drug dosing error alert — Concentration and syringe-unit confusion can cause dosing errors
- DailyMed Bacteriostatic Water for Injection labeling — Official labeling and product-specific dilution precautions
- FDA piston syringe guidance — Device capacity, labeling, and graduation considerations
- FDA bulk peptide safety information — Safety risks associated with certain peptide substances used in compounding
Important safety limitation
This calculator is an educational arithmetic tool. It does not provide medical advice, prescribe a dose, create reconstitution instructions, or replace the product label, pharmacy directions, prescriber instructions, or guidance from a qualified professional.
Confirm the product, concentration, bacteriostatic water volume, syringe type, and scale lines before relying on any conversion. Do not use a U-100 scale result with a syringe that is not labeled U-100.