mcg to mg Converter
Convert micrograms (mcg / µg) to milligrams (mg) and milligrams to micrograms. This is especially useful for medical doses, supplements, and laboratory calculations. Remember: 1 mg = 1000 mcg.
500 mcg → 0.5 mg
Common conversions
| mcg | mg | Context |
|---|---|---|
| 100 mcg | 0.1 mg | e.g. vitamin B12 |
| 250 mcg | 0.25 mg | common tablet dose |
| 500 mcg | 0.5 mg | half a milligram |
| 1000 mcg | 1 mg | 1 mg exactly |
| 2000 mcg | 2 mg | 2 milligrams |
How to convert mcg to mg
Micrograms are one thousandth of a milligram. So:
mg = mcg ÷ 1000
mcg = mg × 1000
Example
1350 mcg ÷ 1000 = 1.35 mg
2 mg × 1000 = 2000 mcg
Medical / pharmacy note
This tool is useful for checking unit changes, but medication doses must always follow the prescription or protocol. If your prescription says “mcg” do NOT assume “mg”: mixing them up causes an ×1000 error.
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Formula (extracted text)
mg = mcg ÷ 1000 mcg = mg × 1000
Variables and units
- No variables provided in audit spec.
Sources (authoritative):
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.