A common recipe and medication-dosing conversion between the metric milliliter and the US customary teaspoon.
How it works
Dividing milliliters by 4.92892159375 gives teaspoons; multiplying teaspoons by that same constant gives milliliters back. Type into either field and the other updates instantly.
What this does not include
This does not include a metric teaspoon, which some countries round to exactly 5 mL instead of the US customary 4.93 mL used here.
How to use this calculator
- Enter a value in either milliliters or teaspoons — the other field fills in automatically.
Frequently asked questions
Why isn’t a teaspoon a round number of milliliters?
Because the US teaspoon comes from the US customary gallon system (1/768 of a gallon), not designed to align neatly with the separately defined metric milliliter.
Where is this conversion most often needed?
Medication dosing (many liquid medicine labels give doses in mL, while US measuring spoons are marked in teaspoons) and recipe conversion between US and metric sources.
Is a “metric teaspoon” different from this?
Yes — some countries define a metric teaspoon as exactly 5 mL for simplicity, distinct from the US customary teaspoon’s 4.93 mL used in this calculator.
