Dosage Unit Conversion Calculator
This conversion calculator handles the unit math nurses and pharmacy staff use every day: mass conversions (mg, mcg, g), mg↔mL using a concentration, percent solutions to mg/mL, and mEq↔mg using molecular weight and valence.
Calculator
LiveEducational tool, not medical advice. Verify every dose against the prescription and your institutional protocol — a licensed clinician is responsible for the final dose.
Enter values to see your result.
How to Use the Calculator
- Select the type of conversion you need.
- Enter the value to convert.
- For mg↔mL provide the concentration; for mEq↔mg provide the molecular weight and valence.
- Read the converted value and the equation used.
When to Use This Calculator
- Converting mg, mcg, and g
- Converting mg to mL using a drug concentration
- Percent solution to mg/mL and mEq↔mg
Frequently Asked Questions
How do I convert mg to mL?
Divide the dose in mg by the concentration in mg/mL. You must know the concentration — mg and mL are not interchangeable without it.
How do I convert a percent solution to mg/mL?
Multiply the percent by 10. A 2% solution is 2 × 10 = 20 mg/mL, because a percent solution is grams per 100 mL.
How do I convert mEq to mg?
mg = mEq × (molecular weight ÷ valence). For example, 1 mEq of potassium (MW 39, valence 1) equals 39 mg.
References & Guidelines
- Standard pharmacology conversion tables.