Teaspoons to ML Converter

A US teaspoon is 4.92892 milliliters — one third of a tablespoon:

milliliters = US teaspoons × 4.92892

In practice a teaspoon is treated as 5 ml everywhere, including in US nutrition labelling and in medicine. The 0.07 ml difference is 1.4%, below the accuracy of any measuring spoon, so the rounding is universal and safe.

Unlike the tablespoon, the teaspoon is consistent internationally: the US, UK, metric and Australian teaspoons are all 5 ml or within a fraction of it. Australia's outsized 20 ml tablespoon is not matched by an outsized teaspoon.

Common amounts:

• ¼ tsp → 1.23 ml
• ½ tsp → 2.46 ml
• 1 tsp → 4.93 ml
• 3 tsp → 14.79 ml (1 tablespoon)
• 6 tsp → 29.57 ml (1 fl oz)

Liquid medicine is the case where this stops being a kitchen question. Dosing instructions say "5 ml", and an actual teaspoon from a cutlery drawer holds anywhere from 2.5 to 7 ml — a study in JAMA Pediatrics found parents using kitchen spoons made dosing errors in a large majority of attempts. Use the oral syringe or the marked cup that came with the medicine; a "teaspoon" of cutlery is not a unit of measurement.

For cooking, the useful anchors are 3 teaspoons to a tablespoon and 48 teaspoons to a cup. And for salt or leavening, a level spoon and a heaped one differ by roughly half again — level them unless the recipe says otherwise.