mg to mL Calculator
mg to mL calculator: convert milligrams to milliliters using the density or concentration of the substance.
Editorial review: Farrow (pseudonym; identity and professional credentials are not disclosed). This page is for educational purposes, not professional advice.
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How does the mg to mL Calculator work?
Milligrams measure mass and milliliters measure volume, so you need the density: mL = mg ÷ (density in g/mL × 1,000).
For example, 500 mg of a liquid with density 1.0 g/mL is 500 ÷ 1,000 = 0.5 mL. Water is 1 g/mL.
Frequently asked questions
How do I convert mg to mL for water?
Divide mg by 1,000. Water is 1 g/mL, so 250 mg is 0.25 mL.
How many mL is 1 mg?
For water (1 g/mL), 1 mg is 0.001 mL. Other substances differ because their density differs.
Why do I need density?
Mass and volume are different units, and density is the link between them.
Can I use this for medication doses?
Only as a math aid. For a drug, use the concentration on the label (mg per mL) and follow your pharmacist or doctor.