To convert 500 milligrams (mg) to teaspoons, we need to know the substance’s density because milligrams measure weight, while teaspoons measure volume. Assuming you mean a common substance like salt or sugar:
For general conversions:
1 teaspoon = approximately 5,000 milligrams (mg) for substances with a similar density to sugar or salt.
So, 500 mg ≈ 0.1 teaspoons.