How to convert mg to mL
For a solution, divide the substance's mass in mg by its concentration in mg/mL. For example, 10 mg at 5 mg/mL occupies 2 mL of that solution.
volume (mL) = mass (mg) ÷ concentration (mg/mL)
How to convert mL to mg
Multiply the solution volume in mL by its concentration in mg/mL. For example, 2 mL at 5 mg/mL contains 10 mg of the dissolved substance.
mass (mg) = volume (mL) × concentration (mg/mL)
How to convert g to mL
For a pure liquid, divide its mass in grams by its density in g/mL. For a dissolved substance, convert grams to milligrams first (1 g = 1,000 mg), then divide by the solution concentration in mg/mL. These are different questions: density describes the liquid's own mass; concentration describes how much of a particular substance it contains.
pure liquid volume (mL) = mass (g) ÷ density (g/mL)
When the conversion is impossible
Mass and volume measure different things. A number such as “10 mg” alone does not tell you how many mL it represents. Find the product's stated concentration or a reliable density for the exact material before calculating. Do not assume every liquid has the density of water.
Need to calculate a peptide solution's concentration from its mass and final volume? Use the peptide concentration calculator. To dilute an existing solution, use the dilution calculator.
Frequently asked questions
Can I convert mg to mL without concentration?
No. You need the concentration of the substance in mg/mL, or a density when measuring the mass of a pure liquid.
How do I use mg/mL to find mL?
Divide the required mass in mg by the known concentration in mg/mL. The result is a volume in mL.
Is 1 g always 1 mL?
No. That would require a density of exactly 1 g/mL. Other liquids have different densities, and a dissolved substance requires its concentration instead.
Educational arithmetic only. For a medicine, verify the concentration and all instructions on the specific product label with a qualified healthcare professional. See our medical disclaimer.