Volume ↔ Weight

mg to mL Calculator

Convert milligrams to millilitres using a solution's concentration (mg/mL) or a pure liquid's density. Milligrams measure mass; millilitres measure volume.

Volume

5 mL

Litres—

Teaspoons (US)—

Concentration—

How it works

Mass and volume are linked by concentration or density. Dividing the milligrams by the concentration in mg per mL gives the volume in millilitres. For a pure substance, the concentration equals its density in g/mL times 1000.

mL = mg ÷ concentration (mg/mL)
Water: 1000 mg = 1 mL (density 1 g/mL)

Worked example

A medicine at 100 mg/mL: a 500 mg dose is 500 ÷ 100 = 5 mL.

Frequently asked questions

How do I convert mg to mL?

Divide mg by the concentration in mg/mL. 500 mg at 100 mg/mL = 5 mL.

Is mg the same as mL?

No — mg is mass, mL is volume; you need density or concentration to convert.