Bacteriostatic Water Calculators

Three quick calculators for planning bacteriostatic water purchases and handling. They run in your browser; nothing is submitted or stored.

Cost per millilitre calculator

Compares packs by cost per mL bought and, more usefully, by cost per mL actually used before the 28-day discard.

Pack price ($)

Shipping for this pack ($)

Vials per pack

mL per vial

Share of each vial used before discard (%)

Effective cost = (pack price + shipping) ÷ (vials × mL per vial × share used). Guide: what determines the cost per vial.

Enter how much a bench draws, and get the vial size that will be used up inside 28 days, plus vials needed per month.

Volume drawn per withdrawal (mL)

Withdrawals per week

Based on the 28-day discard convention after first puncture. Guide: 3 mL vs 10 mL vs 30 mL.

Enter the date a vial was first punctured to get the date it should be discarded.

Date of first puncture

Discard window (days)

Write both dates on the vial. Guide: how to store bacteriostatic water.

All BAC Water Supply products are supplied for laboratory research use only and are not for human or veterinary use.