Convert US teaspoons to milliliters instantly, using the standard definition where one US teaspoon is 4.92892159375 milliliters. This is a small but frequent conversion, useful for recipes, medicine doses, and precise seasoning when an amount is in teaspoons but your syringe or measuring tool is marked in milliliters. Type any number of teaspoons and the milliliter value updates live as you type, with a couple of decimals for accuracy. Note that a US teaspoon differs from the metric teaspoon of 5 milliliters, and this tool uses the US teaspoon, which is the most common online. Getting a dose slightly wrong matters, so letting the tool convert exactly is safer than rounding in your head. It runs entirely in your browser, so it is instant, private, and works offline once the page has loaded.