Milliliters to Milligrams Converter

Milliliters measure volume and milligrams measure mass. A medication conversion needs the product's labeled concentration in mg/mL, not the bulk density of the liquid. Read that concentration from the bottle and use mg = mL x mg/mL. Do not infer it from the liquid's appearance or from a preset.

Do not assume they are. Many current US acetaminophen liquids are labeled 160 mg per 5 mL, but older concentrated infant acetaminophen products used strengths such as 80 mg per 0.8 mL. Products, countries, and formulations can differ. The calculator includes a historical concentrated preset, so verify the exact bottle before entering any value and ask a pharmacist if it is unclear.

Insulin is labeled by biological activity in units. Concentrations include U-100 and more concentrated products, so the prescribed insulin, pen, or syringe must match the label. Never convert an insulin dose to milligrams with this calculator. Follow the prescription and ask a pharmacist or clinician about any mismatch.

Water near room temperature is commonly approximated as 1 g/mL, or 1000 mg/mL. That is useful for general density calculations, but it does not reveal the active-ingredient concentration in a medication. For medication, use the mg/mL value printed on the bottle.

No. Confirm the concentration on the actual bottle and follow the prescription or labeled dosing instructions. Ask a pharmacist or clinician if the product strength or dose is unclear. For a possible poisoning or dosing error in the US, contact Poison Control at 1-800-222-1222. Never adjust a prescription dose from a unit conversion alone.