BAC Water Calculator

Reconstituting research peptides takes bacteriostatic water. Work out exactly how much your order needs, then add it to your cart in one click.

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3 mL

Each peptide vial uses 3 mL of BAC water.

30 mL

Each BAC water vial holds 30 mL.

Up to 10 vials

That is enough for up to 10 peptide vials.

BAC water calculator

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    BAC water needed Live Auto-calculated
    0 mL BAC water Total needed
    0 mL
    • 0mL needed
    • 0Vials to order
    • 0mL left over

    For research use only. Each vial contains 30 mL of bacteriostatic water (plain).

    How to use this calculator
    1. Add your peptides to cart

      Shop your peptides and add them to your cart. They appear here automatically.

    2. Add any other vials

      Already have peptides, or bought them elsewhere? Use “Add peptide vials” to include them in the count.

    3. See your vial count instantly

      The calculator shows exactly how many mL of BAC water — and how many vials — you need.

    4. Add BAC water to cart

      Once the amount is worked out, adding the right quantity to your cart is one click.

    Quick reference
    Peptide vials BAC water Vials
    1 3 mL 1
    2 6 mL 1
    5 15 mL 1
    10 30 mL 1
    11 33 mL 2
    20 60 mL 2
    Why bacteriostatic water?

    BAC water contains 0.9% benzyl alcohol, which inhibits microbial growth and lets a vial be used more than once safely — which is what makes it the standard for peptide reconstitution.

    Frequently asked questions



    Three millilitres per peptide vial is the standard reconstitution volume, which gives a stable working concentration for typical research use.

    Bacteriostatic water stays stable for 30 days after first use at room temperature with proper sterile technique. Refrigeration after opening is recommended.

    One 30 mL vial covers up to ten peptide vials at 3 mL each. The volume left over stays protected by the benzyl alcohol preservative.

    Sterile water has no preservative and suits single-use reconstitution only. BAC water is strongly preferred for peptide vials that will be drawn from more than once.

    What the BAC water calculator does

    The calculator takes the guesswork out of reconstituting research peptides. Add your peptides to the cart, or enter the vials you already have, and it returns the exact volume of bacteriostatic water the batch needs and how many bottles that comes to. It replaces the error-prone arithmetic that leads to over- or under-dosing, so every draw stays consistent from the first to the last.

    Bacteriostatic water vial

    Insulin syringe drawing from a peptide vial

    How to use the BAC water calculator

    The calculator works in three steps:

    1. Add your peptides to the cart — everything in your cart is counted here automatically.
    2. Add any vials you already own — peptides bought elsewhere still need water, so include them in the count.
    3. Read the total — the panel shows the millilitres needed, the bottles to order and what will be left over.

    Why accurate reconstitution matters

    Reconstitution is where most avoidable errors start. Too little bacteriostatic water and the volumes are hard to measure; too much and each dose may be inconsistent. Because the calculator shows the arithmetic behind every step, the milligram count on the label is the milligram count in the syringe. Pair it with third-party tested peptides and clean water and you stay in control of what goes into the vial, what is drawn out of it, and how much reaches each sample.

    Peptide molecule illustration

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