mg ⇄ mL Converter
Convert weight and volume using a preset liquid, custom density, or medication concentration.
Conversion setup
Enter one known value
Results
Step-by-step derivation
References
- Volume from weight: mL = mg ÷ concentration
- Weight from volume: mg = concentration × mL
- Preset approximations: water ≈ 1000 mg/mL, milk ≈ 1035 mg/mL, cooking oil ≈ 911 mg/mL
Use this mg to mL Calculator to convert between mass and volume when you know a liquid’s density or a medication concentration.
Important: Milligrams measure mass and milliliters measure volume, so there is no universal mg-to-mL conversion without a known density or concentration.
Calculation Method
For a medication or solution given in mg/mL:
Volume (mL) = mass (mg) ÷ concentration (mg/mL)
For the reverse conversion:
Mass (mg) = concentration (mg/mL) × volume (mL)
If concentration is shown as mg/5 mL:
mg/mL = label amount ÷ 5
For a non-medication liquid with density in g/mL:
Volume (mL) = mass (mg) ÷ [density (g/mL) × 1,000]
Example
If a liquid concentration is 50 mg/mL and the known amount is 200 mg:
Volume = 200 ÷ 50 = 4 mL
Therefore, 200 mg equals 4 mL only at that specific concentration.
Important Safety Note
This calculator converts a known amount using a known concentration. It does not determine what medication dose is appropriate or safe.
For medicines, use the exact concentration printed on the product or pharmacy label and follow the prescribed or labeled dose. Do not substitute the concentration from another product or strength.