Infusion Concentration Calculator

Work out infusion concentration instantly with clear inputs, formula shown and shareable results.

About Infusion Concentration Calculator

Divides the drug added by the bag volume to give the infusion concentration in the units used on pump programming screens.

Formula

Infusion concentration

mg/mL = drug mass (mg) / bag volume (mL); mcg/mL = mg/mL x 1000

Worked example

With the default values below, Infusion Concentration Calculator returns Infusion concentration of 0.5000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Drug added to the bagaccepts 0.1–50,000 mg: 250 mg
Bag volumeaccepts 1–5,000 mL: 500 mL

Results

Infusion concentration: 0.5000 mg/mL
Concentration: 500.00 mcg/mL
Percentage strength w/v: 0.0500%

Step by step

1Values used
2Infusion concentration
3Infusion concentration= 0.5000 mg/mL
4Concentration= 500.00 mcg/mL
5Percentage strength w/v= 0.0500

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Should the added drug volume be included?

For accuracy yes, especially with small bags; many protocols specify removing an equal volume before adding the drug.

Why do concentrations need standardising?

Standard concentrations reduce programming errors, which is why smart pumps hold a fixed drug library.