Convert milligrams (mg) to milliliters (ml) and vice versa. Enter the mass, select your substance or enter density, and get instant results.
mg
Milligrams
ml
Milliliters
Formula:
Volume (ml) = Mass (mg) ÷ Density (mg/ml)
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Converting milligrams (mg) to milliliters (ml) involves converting a unit of mass (mg) to a unit of volume (ml). Unlike converting between the same type of measurement (like meters to kilometers), this conversion requires knowing the density of the substance.
Milligrams (mg) measure how much something weighs, while milliliters (ml) measure how much space something takes up. The relationship between them depends entirely on what substance you're measuring.
Density is the mass per unit volume of a substance, typically expressed as mg/ml or g/ml. It tells you how much a certain volume of a substance weighs.
Density = Mass ÷ Volume
ml = mg ÷ density
Divide the mass in milligrams by the density in mg/ml to get the volume in milliliters.
mg = ml × density
Multiply the volume in milliliters by the density in mg/ml to get the mass in milligrams.
| Substance | Density (mg/ml) | Density (g/ml) | 100 mg = ? ml |
|---|---|---|---|
| Water | 1,000 | 1.00 | 0.1 ml |
| Whole Milk | 1,030 | 1.03 | 0.097 ml |
| Olive Oil | 916 | 0.916 | 0.109 ml |
| Honey | 1,420 | 1.42 | 0.070 ml |
| Ethanol | 789 | 0.789 | 0.127 ml |
| Glycerin | 1,261 | 1.261 | 0.079 ml |
| Maple Syrup | 1,370 | 1.37 | 0.073 ml |
Given: Mass = 500 mg, Density of water = 1000 mg/ml
Formula: Volume = Mass ÷ Density
Calculation: Volume = 500 ÷ 1000 = 0.5 ml
Given: Mass = 250 mg, Density of olive oil = 916 mg/ml
Formula: Volume = Mass ÷ Density
Calculation: Volume = 250 ÷ 916 = 0.273 ml
Given: Volume = 2 ml, Density of honey = 1420 mg/ml
Formula: Mass = Volume × Density
Calculation: Mass = 2 × 1420 = 2,840 mg
You cannot directly convert mg to ml without knowing the density. These units measure different things—mass vs. volume. The density bridges the gap between them.
100 mg of water = 0.1 ml
100 mg of honey = 0.07 ml
100 mg of oil = 0.109 ml
Denser substances take up less space for the same mass.
1 ml of water = 1000 mg
1 ml of honey = 1420 mg
1 ml of oil = 916 mg
Denser substances weigh more for the same volume.
Converting drug dosages between mass and volume for liquid medications, syrups, and injectable solutions.
Converting recipe measurements between weight and volume for ingredients like oils, honey, and milk.
Preparing solutions, reagents, and samples that require precise mass-to-volume calculations.
Formulating skincare products, essential oil blends, and cosmetic preparations with precise measurements.
Divide the mass in milligrams by the density of the substance in mg/ml. Formula: ml = mg ÷ density. For example, 100 mg of water (density 1000 mg/ml) = 100 ÷ 1000 = 0.1 ml.
No. Milligrams measure mass (weight), while milliliters measure volume (space). They cannot be directly equated. For water, 1 ml = 1000 mg. For other substances, the conversion depends on their density.
It depends on the substance. For water: 500 mg = 0.5 ml. For olive oil: 500 mg ≈ 0.546 ml. For honey: 500 mg ≈ 0.352 ml. Always use the correct density for your substance.
The density of pure water at room temperature (25°C) is approximately 1000 mg/ml or 1 g/ml. This makes water a convenient reference point for conversions.
Because mg measures mass and ml measures volume—two fundamentally different properties. The same mass of different substances occupies different volumes. Density is the bridge that connects mass and volume.
You can look up standard densities in reference tables, check product labels (especially for food and chemicals), or calculate it by measuring the mass and volume yourself (density = mass ÷ volume).
Yes. Density changes with temperature—liquids generally expand when heated and contract when cooled. For most everyday conversions, room temperature densities are accurate enough, but scientific applications may require temperature-specific values.
They measure the same thing (density) but in different units. 1 g/ml = 1000 mg/ml. Water has a density of 1 g/ml or 1000 mg/ml. Use whichever unit matches your input values.
Converting between milligrams and milliliters requires understanding that these units measure different properties—mass and volume. The key to accurate conversion is knowing the density of the substance you're working with.
Our mg to ml converter makes these calculations instant and accurate. Simply enter your value, select your substance (or enter a custom density), and get immediate results with step-by-step explanations. Perfect for cooking, medicine, laboratory work, and more!