Micrograms to Milligrams (mcg to mg) Converter
Convert between micrograms and milligrams using SI prefix definitions. Both directions supported with adjustable decimal precision.
How SI Prefixes Work
Micro (µ or mcg) is the SI prefix for 10⁻⁶ and milli is the SI prefix for 10⁻³. This means there are 1,000 micrograms in 1 milligram. To convert between these units, you divide when going from smaller to larger units (mcg → mg) and multiply when going from larger to smaller units (mg → mcg).
Formulas
Worked Examples
Example 1: Convert 250 mcg to mg
mg = 250 ÷ 1,000
mg = 0.25
Example 2: Convert 1.5 mg to mcg
mcg = 1.5 × 1,000
mcg = 1,500
Example 3: Convert 75 mcg to mg
mg = 75 ÷ 1,000
mg = 0.075
When This Converter Is Used
- •Converting medication doses written in micrograms vs milligrams
- •Double-checking syringe/ampoule strength vs charted dose
- •Preventing unit errors (mcg vs mg medication errors)
Clinical safety note: Always verify conversions and follow your facility's protocols. This calculator supports verification but does not replace clinical judgement.
Related Calculators
Frequently Asked Questions
Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.
References & Sources
These sources define SI prefixes and unit conventions used for mcg ↔ mg conversion.