Milligrams measure a very small weight, common for supplements and medications, while teaspoons measure volume.
How it works
Milligrams are converted to milliliters using the substance’s density, then divided by 4.9289 (mL per US teaspoon) to get teaspoons. The default density is water’s.
What this does not include
This does not include dosing guidance — always follow the specific instructions on a medication or supplement label rather than converting and second-guessing it yourself.
How to use this calculator
- Enter the milligrams and the substance’s density (defaults to water).
Frequently asked questions
Why does this conversion matter for medications?
Some liquid medication doses are given in milligrams of active ingredient, while household measuring is often done in teaspoons — this bridges the two, though a specific product’s actual concentration should always be checked.
Why does water default to exactly 1 g/mL?
Because 1 milliliter of water weighs almost exactly 1 gram at standard conditions — a widely used, convenient reference point.
Is this the same as the site’s grams-to-tsp calculator?
Same underlying method, just scaled down to milligrams instead of grams, useful for smaller dose-level quantities.
