Milligrams to Milliliters Converter

No. For water near room temperature, 1000 mg occupies approximately 1 mL, but the relationship changes with density and temperature. Ethanol has a density near 0.789 g/mL, so 1000 mg occupies about 1.267 mL. The general formula is mL = mg / 1000 / density, with density in g/mL.

Density is mass divided by volume, and it depends on how tightly the molecules pack together. Water (1.000 g/mL) is the reference, but values span an enormous range. Ethanol (0.789 g/mL) is lighter because its molecules are less polar and pack loosely. Olive oil (0.91 g/mL) floats on water for the same reason. Mercury (13.534 g/mL) is over thirteen times denser than water because it is a heavy metal. Pick the right density for the substance you have or the conversion will be off by anywhere from a few percent to more than a factor of ten.

No. This density conversion is not medication dosing. Medication dosing uses the labeled concentration, such as mg/mL, not the liquid's bulk density. Use the exact product label and its supplied measuring device, and ask a pharmacist or clinician if the concentration or dose is unclear.

Whole milk is about 1.03 g/mL (slightly denser than water because of dissolved solids), olive oil is about 0.91 g/mL (floats on water), and honey is about 1.42 g/mL (sinks and pours slowly because it is so dense). Cream is roughly 0.99 to 1.01 g/mL depending on fat content. These are the values the converter uses for its built-in presets and they line up with what food-science references publish.

Yes, for general mass-to-volume conversions. Use mg to mL when you know mass and density, or mL to mg when you know volume and density. The formulas are mL = mg / 1000 / density and mg = mL x 1000 x density, with density in g/mL. These formulas do not determine a medication dose.