Pure unit maths: 1 mg = 1000 mcg. Type a number in either box; the other updates. Fields start blank. No suggested amounts and no protocols.
Formula: mcg = mg × 1000 · mg = mcg ÷ 1000.
Labels and logbooks often switch between milligrams and micrograms. This page only multiplies or divides by 1000 so you can read both scales. It does not tell you what to use.
It is not a dosing calculator. It does not suggest amounts, frequencies, or reconstitution steps.