Editing Teaspoon (section)

===United States customary unit===
{{hatnote|See [[United States customary units]] for relative volumes of these and other measures.}}
As a unit of culinary measure, one teaspoon in the United States is {{frac|1|3}} [[tablespoon]], exactly {{val|4.92892159375}}&nbsp;[[Litre#SI prefixes applied to the litre|millilitres]] (mL), 1{{frac|1|3}} [[Dram (unit)#Unit of volume|US customary fluid drams]], {{frac|1|6}} [[Fluid ounce|US customary fl. oz]], {{frac|1|48}} [[Cup (volume)|US cup]], {{frac|1|768}} US liquid [[gallon]], or {{frac|77|256}}&nbsp;(0.30078125)&nbsp;[[cubic inch]]es.

{|
|-
|1 US customary teaspoon&nbsp;
||=
|align=right|1{{sfrac|1|3}}||US customary fluid drams
|-
|||=
|align=right|{{sfrac|1|6}}||US customary fluid ounce
|-
|||=
|align=right|{{sfrac|1|3}}||[[Tablespoon#United States|US customary tablespoon]]
|-
|||=
|align=right|{{sfrac|1|2}}||[[Dessert spoon#Culinary measure|US customary dessert spoon]]
|-
|||=
|align=right|2||US customary coffee spoons
|-
|||=
|align=right|4||[[Salt spoon|US customary salt spoons]]
|-
|||=
|align=right|8||[[Cooking_weights_and_measures#United_States_measures|US customary dashes]] (solids only)
|-
|||=
|align=right|16||[[Pinch (unit)|US customary pinches]] (solids only)
|-
|||=
|align=right|32||[[Cooking weights and measures#United States measures|US customary smidgens]] (solids only)
|-
|||=
|align=right|96||[[Drop (unit)|US customary drops]] (liquids only)
|-
|||≈
|align=right|1.39||[[Dram (unit)#Unit of volume|British imperial fluid drachms]]
|-
|||≈
|align=right|0.17||[[Fluid ounce|British imperial fluid ounce]]
|-
|||≈
|align=right|0.35||[[Tablespoon#United Kingdom|UK tablespoon]]
|-
|||≈
|align=right|0.69||[[Dessert spoon#Culinary measure|UK dessert spoons]]
|-
|||≈
|align=right|1.39||[[Teaspoon#British culinary measurement unit|UK teaspoons]]
|-
|||≈
|align=right|2.78||[[Salt spoon|UK salt spoons]]
|-
|||≈
|align=right|5.55||[[Pinch (unit)|UK pinches]] (solid only)
|-
|||≈
|align=right|83.27||[[Drop (unit)|UK drops]] (liquids only)
|-
|||=
|align=right|4.92892159375||[[Litre#SI prefixes applied to the litre|millilitres]]
|-
|||≈
|align=right|0.33||[[Tablespoon#International metric|international metric tablespoon]]
|-
|||≈
|align=right|0.25||[[Tablespoon#Australian metric|Australian metric tablespoon]]
|-
|||≈
|align=right|0.49||[[Dessert spoon#Culinary measure|metric dessert spoon]]
|-
|||≈
|align=right|0.99||[[Teaspoon#Metric teaspoon|metric teaspoon]]
|}

For nutritional labeling and medicine in the US, the teaspoon is defined the same as a metric teaspoon{{mdash}}precisely 5&nbsp;millilitres (mL).<ref>21CFR101.9(b)(5)(viii) [http://edocket.access.gpo.gov/cfr_2004/aprqtr/21cfr101.9.htm 2 1CFR101.9]</ref>