One milligram equals 1,000 micrograms. A microgram may appear as mcg or µg. Convert both label figures to the same unit and check whether each figure is per tablet or per labelled serving before you compare.
Try the conversion on two labels
A fictional product lists 0.05 mg of a nutrient per serving. Multiply by 1,000 to get 50 mcg. Another product lists 25 mcg per tablet and two tablets per serving. That also gives 50 mcg for its labelled serving. Copy the nutrient name as well as the unit so you compare the same substance.
| From | To | What to do |
|---|---|---|
| mg | mcg or µg | Multiply by 1,000 |
| mcg or µg | mg | Divide by 1,000 |
Keep units and percentages in separate columns
A label may list a quantity and a percentage of a reference value on the same line. Use the declared quantity for the calculation. The percentage RDA guide explains the percentage. International Units, often printed as IU, use substance-specific conversions. Check a verified reference for that nutrient if you need to compare an IU figure.
If you are checking products you already use, put the original amount and your conversion side by side. Show both labels to a pharmacist if the units or serving instructions leave you unsure. The medicine and supplement record gives you somewhere to keep them.