mg to mL Calculator
Converting milligrams (mass) to milliliters (volume) needs one number from the label: the concentration, such as 250 mg per 5 mL.
Formula
- mL = mg ÷ concentration (mg/mL)
- mg = mL × concentration (mg/mL)
- Concentration = label mg ÷ label mL (e.g. 250 mg / 5 mL = 50 mg/mL)
mg to mL chart
Volume in mL for a given number of mg at each concentration.
| mg ↓ / mg/mL → | 1 | 2 | 5 | 10 | 20 | 25 | 50 | 100 |
|---|---|---|---|---|---|---|---|---|
| 1 mg | 1 | 0.5 | 0.2 | 0.1 | 0.05 | 0.04 | 0.02 | 0.01 |
| 2.5 mg | 2.5 | 1.25 | 0.5 | 0.25 | 0.125 | 0.1 | 0.05 | 0.025 |
| 5 mg | 5 | 2.5 | 1 | 0.5 | 0.25 | 0.2 | 0.1 | 0.05 |
| 10 mg | 10 | 5 | 2 | 1 | 0.5 | 0.4 | 0.2 | 0.1 |
| 25 mg | 25 | 12.5 | 5 | 2.5 | 1.25 | 1 | 0.5 | 0.25 |
| 50 mg | 50 | 25 | 10 | 5 | 2.5 | 2 | 1 | 0.5 |
| 100 mg | 100 | 50 | 20 | 10 | 5 | 4 | 2 | 1 |
| 250 mg | 250 | 125 | 50 | 25 | 12.5 | 10 | 5 | 2.5 |
| 500 mg | 500 | 250 | 100 | 50 | 25 | 20 | 10 | 5 |
Measuring very small volumes on an insulin syringe? See units to mg.
FAQ
How do I convert mg to mL?
Divide the mg by the concentration in mg/mL: mL = mg ÷ (mg/mL). Example: 250 mg of a 50 mg/mL liquid = 5 mL.
Is 1 mg equal to 1 mL?
Only for a liquid whose concentration is exactly 1 mg/mL. mg measures mass and mL measures volume, so the conversion always depends on concentration (or density).
My label says mg per 5 mL — what do I enter?
Enter the mg and the 5 mL; the calculator divides them to get mg/mL. For example 250 mg/5 mL = 50 mg/mL.
How do I convert mg to mL for water?
Pure water has a density of about 1 g/mL, so 1,000 mg ≈ 1 mL. That only applies to water, not to medicines or solutions.
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