Milligrams to Milliliters Converter (mg to mL)
Convert milligrams to milliliters (mg to mL) for any substance. Select from 20 common ingredients or enter a custom density. See results in mL, teaspoons, fluid ounces, and drops.
VOLUME IN MILLILITERS
0.5 mL
FLUID OUNCES
0.0169 fl oz
TEASPOONS
0.1014 tsp
DROPS (~20/mL)
10.0 drops
FORMULA
500 ÷ (1×1000)
Quick Reference — Water
| Milligrams | Milliliters | Teaspoons | Drops |
|---|---|---|---|
| 10 mg | 0.0100 mL | 0.0020 tsp | 0.2 drops |
| 25 mg | 0.0250 mL | 0.0051 tsp | 0.5 drops |
| 50 mg | 0.0500 mL | 0.0101 tsp | 1.0 drops |
| 100 mg | 0.1000 mL | 0.0203 tsp | 2.0 drops |
| 200 mg | 0.2000 mL | 0.0406 tsp | 4.0 drops |
| 250 mg | 0.2500 mL | 0.0507 tsp | 5.0 drops |
| 500 mg | 0.5000 mL | 0.1014 tsp | 10.0 drops |
| 750 mg | 0.7500 mL | 0.1522 tsp | 15.0 drops |
| 1000 mg | 1.0000 mL | 0.2029 tsp | 20.0 drops |
| 1500 mg | 1.5000 mL | 0.3043 tsp | 30.0 drops |
| 2000 mg | 2.0000 mL | 0.4058 tsp | 40.0 drops |
| 5000 mg | 5.0000 mL | 1.0144 tsp | 100.0 drops |
How to Convert Milligrams to Milliliters
Milligrams (mg) measure weight, while milliliters (mL) measure volume. To convert between them, you need the substance's density. The formula is:
Or equivalently: mL = mg ÷ density in mg/mL
Example: 500 mg of water (density 1.00 g/mL)
= 500 ÷ (1.00 × 1000) = 500 ÷ 1000 = 0.5 mL
Example: 500 mg of olive oil (density 0.91 g/mL)
= 500 ÷ (0.91 × 1000) = 500 ÷ 910 = 0.5495 mL
For water and water-based solutions (like most liquid medications), 1 mg ≈ 0.001 mL, or equivalently, 1 mL ≈ 1,000 mg. This is because water has a density of approximately 1.00 g/mL.
Common mg to mL Conversions
Quick reference for how many milliliters common milligram amounts equal (for water-density substances like most medications):
| Milligrams | Milliliters (water) | Teaspoons | Drops (~20/mL) |
|---|---|---|---|
| 10 mg | 0.01 mL | 0.002 tsp | 0.2 drops |
| 25 mg | 0.025 mL | 0.005 tsp | 0.5 drops |
| 50 mg | 0.05 mL | 0.01 tsp | 1.0 drops |
| 100 mg | 0.1 mL | 0.02 tsp | 2.0 drops |
| 200 mg | 0.2 mL | 0.04 tsp | 4.0 drops |
| 250 mg | 0.25 mL | 0.05 tsp | 5.0 drops |
| 500 mg | 0.5 mL | 0.1 tsp | 10.0 drops |
| 1,000 mg (1 g) | 1.0 mL | 0.2 tsp | 20.0 drops |
| 2,000 mg (2 g) | 2.0 mL | 0.4 tsp | 40.0 drops |
| 5,000 mg (5 g) | 5.0 mL | 1.0 tsp | 100.0 drops |
Medication Dosing Reference
One of the most common reasons Americans convert mg to mL is for medication dosing. Here's how common US OTC medications relate:
| Medication | Typical Dose | Concentration | Volume to Take |
|---|---|---|---|
| Children's Tylenol (acetaminophen) | 160 mg | 160 mg/5 mL | 5.0 mL (1 tsp) |
| Children's Advil (ibuprofen) | 100 mg | 100 mg/5 mL | 5.0 mL (1 tsp) |
| Children's Benadryl (diphenhydramine) | 12.5 mg | 12.5 mg/5 mL | 5.0 mL (1 tsp) |
| NyQuil (dextromethorphan) | 30 mg | 15 mg/15 mL | 30.0 mL (2 tbsp) |
| Amoxicillin suspension | 250 mg | 250 mg/5 mL | 5.0 mL (1 tsp) |
⚠️ Important: This table is for educational reference only. Always follow your doctor's dosing instructions and read the medication label carefully. Medication concentrations vary by brand and formulation.
Measuring Small Volumes
When dealing with milligrams, the resulting volumes are often very small. Here are the most common measuring tools:
| Measurement Tool | Volume | Equivalent |
|---|---|---|
| Standard medical dropper | ~1 mL (20 drops) | 1 cc |
| 1/4 teaspoon | ~1.23 mL | — |
| 1/2 teaspoon | ~2.46 mL | — |
| 1 teaspoon | ~4.93 mL | ~5 mL (medical standard) |
| 1 tablespoon | ~14.79 mL | ~15 mL (medical standard) |
| Oral syringe (common sizes) | 1, 3, 5, or 10 mL | Most accurate for small doses |
Tip: 1 mL = 1 cc (cubic centimeter). In medical settings, mL and cc are used interchangeably.
What Is a Milligram?
A milligram (mg) is a metric unit of mass equal to one thousandth of a gram (1/1,000 g), or one millionth of a kilogram. "Milli-" means thousandth. Milligrams are commonly used for medication dosages, nutritional supplement amounts, and in chemistry for small quantities of substances.
What Is a Milliliter?
A milliliter (mL) is a metric unit of volume equal to one thousandth of a liter (1/1,000 L), or exactly 1 cubic centimeter (cc). Milliliters are used for measuring liquid medications, small cooking quantities, and laboratory solutions. In medical contexts, mL and cc are interchangeable.
When to Convert mg to mL
- Medication dosing: Prescriptions are often written in milligrams, but liquid medications are measured in milliliters. Knowing the concentration (e.g., 100 mg/5 mL) lets you calculate the correct volume.
- Vitamin and supplement dosing: Liquid vitamins and supplements list amounts in mg but are measured with droppers in mL.
- Laboratory work: Preparing chemical solutions requires converting between mass (mg of solute) and volume (mL of solution).
- Essential oils and flavorings: Recipes may specify mg of a flavoring, but you dispense with a dropper measured in mL.
- Pet medications: Veterinary doses are calculated by the pet's weight in mg, then measured in mL from a liquid formulation.