Enter the mass (mg) and the density into the calculator to determine the volume (mL). The default setting uses the density of water (≈ 1.00 g/mL). This calculator can also convert mL to mg.
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MG to ML Formula
The following formula is used to convert milligrams to milliliters.
mL = (mg / 1000) / D
- Where mL is milliliters
- mg is milligrams
- D is the density (g/mL or g/cm³)
To calculate milliliters from milligrams, if your density is in g/mL (or g/cm³), convert mg to grams by dividing by 1000, then divide by the density.
| Substance | Density (mg/mL) | 100 mg | 500 mg | 1,000 mg |
|---|---|---|---|---|
| Water (pure) | 1,000 | 0.100 mL | 0.500 mL | 1.000 mL |
| Seawater (3.5% salinity) | 1,025 | 0.098 mL | 0.488 mL | 0.976 mL |
| Whole milk | 1,030 | 0.097 mL | 0.485 mL | 0.971 mL |
| Hydrogen peroxide (3%) | 1,010 | 0.099 mL | 0.495 mL | 0.990 mL |
| Glycerin | 1,261 | 0.079 mL | 0.397 mL | 0.793 mL |
| Corn syrup | 1,380 | 0.072 mL | 0.362 mL | 0.725 mL |
| Honey | 1,400 | 0.071 mL | 0.357 mL | 0.714 mL |
| Olive oil | 911 | 0.110 mL | 0.549 mL | 1.098 mL |
| Canola oil | 920 | 0.109 mL | 0.543 mL | 1.087 mL |
| Sunflower oil | 920 | 0.109 mL | 0.543 mL | 1.087 mL |
| Ethanol (pure) | 789 | 0.127 mL | 0.634 mL | 1.267 mL |
| Acetone | 784 | 0.128 mL | 0.638 mL | 1.276 mL |
| Gasoline | 748 | 0.134 mL | 0.669 mL | 1.337 mL |
| Mercury | 13,534 | 0.0074 mL | 0.0369 mL | 0.0739 mL |
| * Densities at ~20°C. Values rounded to 3 decimal places. Use the calculator above for custom densities. | ||||
Medications: Concentration vs. Density
For liquid medications, the label states a concentration (mg/mL), not a physical density. Use concentration directly: mL = prescribed dose (mg) ÷ concentration (mg/mL).
| Medication | Label | Concentration | Example: 250 mg dose |
|---|---|---|---|
| Acetaminophen (children's) | 160 mg / 5 mL | 32 mg/mL | 7.8 mL |
| Ibuprofen (children's) | 100 mg / 5 mL | 20 mg/mL | 12.5 mL |
| Amoxicillin suspension | 250 mg / 5 mL | 50 mg/mL | 5.0 mL |
| Amoxicillin suspension (high-dose) | 400 mg / 5 mL | 80 mg/mL | 3.1 mL |
| Azithromycin suspension | 200 mg / 5 mL | 40 mg/mL | 6.3 mL |
| * Always verify concentration on your specific product label. Consult a pharmacist for dosing guidance. | |||
Mg to mL Definition
Milligrams (mg) measure mass; milliliters (mL) measure volume. These are fundamentally different physical quantities, so a direct conversion requires a bridge: density (g/mL). Density describes how much mass occupies a unit of volume. Water has a density of 1.00 g/mL, so 1,000 mg of water occupies exactly 1 mL. Oils are less dense (~0.91 g/mL), so 1,000 mg of olive oil occupies ~1.1 mL. Honey is denser (~1.40 g/mL), so 1,000 mg of honey fits in just 0.71 mL. The same mass of different substances will always occupy different volumes.
Mg to ML Example
How to convert mg to mL?
- First, determine the mass.
Measure the mass of the substance in mg (or measure in grams and convert: 1 g = 1000 mg).
- Next, determine the density.
Measure the density of the fluid or object (commonly in g/mL or g/cm³).
- Finally, calculate the volume.
Calculate the volume using the formula above.
FAQ
Mg to mL is the conversion of mass (milligrams) to volume (milliliters). Because mass and volume are different physical properties, the conversion requires knowledge of the substance's density. For water at 20°C, 1,000 mg = 1 mL exactly.
Only for water. 1 mg of water = 0.001 mL (since water's density is 1,000 mg/mL). For other substances: 1 mg of honey occupies ~0.00071 mL (honey is denser than water), and 1 mg of ethanol occupies ~0.00127 mL (ethanol is less dense than water).
It depends on the substance. For water: 500 mg = 0.5 mL. For olive oil (density 911 mg/mL): 500 mg = 0.549 mL. For glycerin (density 1,261 mg/mL): 500 mg = 0.397 mL. Use the formula: mL = mg ÷ density (mg/mL).
For medications, use the concentration printed on the label (e.g., '250 mg/5 mL' = 50 mg/mL), not physical density. Divide the prescribed dose in mg by the concentration: mL = dose (mg) ÷ concentration (mg/mL). Example: a 125 mg dose of amoxicillin 250 mg/5 mL suspension = 125 ÷ 50 = 2.5 mL. Always confirm with a pharmacist.