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Tools · laboratory utility
Work out the volume of bacteriostatic water to add, the resulting working concentration, and the syringe units corresponding to a given target mass. Inputs update results live — no submit button.
For research use only. Not for human or veterinary consumption.
The calculator applies the same arithmetic any pharmaceutical chemist would do on the back of a receipt — there is no proprietary magic involved.
Working concentration
concentration (mg/mL) = vial mass (mg) ÷ diluent volume (mL)
Draw volume per target mass
volume (mL) = target mass (mg) ÷ concentration (mg/mL)
Syringe units
units = volume (mL) × syringe calibration (units per mL). A U-100 insulin syringe is 100 units per 1 mL.
Doses per vial
doses = vial mass (mg) ÷ target mass per dose (mg)
Need the chemistry behind reconstitution itself — bacteriostatic water vs. saline, storage at –20 °C, lyophilisate handling? See the testing methodology page or get in touch via our contact form.