US teaspoon to Imperial fluid ounce
tsp
imp fl oz
Conversion History
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Quick Reference Table (US teaspoon to Imperial fluid ounce)
| US teaspoon (tsp) | Imperial fluid ounce (imp fl oz) |
|---|---|
| 0.25 | 0.04336844711649910329 |
| 0.5 | 0.08673689423299820659 |
| 1 | 0.17347378846599641317 |
| 2 | 0.34694757693199282635 |
| 3 | 0.52042136539798923952 |
| 6 | 1.04084273079597847904 |
About US teaspoon (tsp)
The US teaspoon (tsp) is a unit of culinary volume equal to approximately 4.929 milliliters, one third of a US tablespoon. It is one of the smallest standard US customary volume units, used in cooking, baking, and medicine for small ingredient quantities. The US teaspoon differs from the metric teaspoon (exactly 5 mL) and the imperial teaspoon (about 5.92 mL). In medicine, 5 mL is the standardized dosing teaspoon.
A standard dose of liquid children's medicine is one 5 mL teaspoon. A recipe calling for 1 tsp of vanilla extract uses about 4.93 mL.
About Imperial fluid ounce (imp fl oz)
The imperial fluid ounce (imp fl oz) is a unit of volume equal to one twentieth of an imperial pint, approximately 28.413 milliliters. It is used in the United Kingdom and Commonwealth countries, though metric units have replaced it in most commercial contexts. The imperial fluid ounce is slightly smaller than the US fluid ounce (29.574 mL). UK spirits measures are now defined by law in 25 mL and 35 mL metric measures, which do not align exactly with the imperial fluid ounce.
A single spirits measure in a UK bar is 25 mL or 35 mL — close to, but not exactly, one imperial fluid ounce (28.41 mL).
US teaspoon – Frequently Asked Questions
How many milliliters is a US teaspoon?
One US teaspoon equals approximately 4.929 mL, typically rounded to 5 mL in medicine and 4.93 mL in precise culinary conversions. The metric teaspoon used in Australia and Canada is exactly 5 mL.
What is the difference between a US teaspoon and an imperial teaspoon?
A US teaspoon is about 4.93 mL; an imperial (UK) teaspoon is about 5.92 mL — approximately 20% larger. This difference can affect recipes crossing US and UK sources, particularly for spices and leavening agents.
How many teaspoons are in a tablespoon?
In the US system, 3 teaspoons equal 1 tablespoon (3 × 4.929 mL = 14.787 mL). The metric equivalent is the same ratio: 3 × 5 mL = 15 mL tablespoon.
Is a medicine teaspoon the same as a cooking teaspoon?
Not exactly. Medicine dosing uses a standardized 5 mL teaspoon, while the US cooking teaspoon is about 4.93 mL. For medication accuracy, always use a calibrated oral syringe rather than a kitchen teaspoon, which can vary from 3 to 7 mL.
How many US teaspoons are in a cup?
There are 48 US teaspoons in one US cup: 1 cup = 16 tablespoons = 48 teaspoons.
Imperial fluid ounce – Frequently Asked Questions
Why did the UK abandon the fluid ounce for spirits but keep the pint for beer?
When the UK metricated in the 1990s, spirits measures were switched to 25 mL and 35 mL because publicans needed precise, legally enforceable pour sizes — and optic dispensers were easy to replace with metric ones. Beer, however, had enormous cultural resistance: the "pint" is deeply embedded in British pub identity, and the Campaign for Real Ale lobbied hard. Parliament granted an explicit exemption allowing draft beer and cider to be sold by the imperial pint. Milk got a similar exemption. The result is a hybrid system where your gin is metric but your beer is imperial.
How many imperial fluid ounces are in a UK pint?
There are exactly 20 imperial fluid ounces in one UK pint (568 mL). In the US system, 1 pint = 16 US fluid ounces (473 mL).
Is the imperial fluid ounce still used?
The imperial fluid ounce is rarely used for commercial transactions in the UK today, which metricated in the 1990s. UK spirits servings are now legally defined in metric (25 mL or 35 mL).
Why is a UK shot 25 mL not one fluid ounce?
When the UK metricated bar measures, the 25 mL "metric measure" replaced older imperial measures. One imperial fl oz (28.41 mL) was not adopted because the EU standardized on 25 mL. So UK shots are not exactly one fl oz.
How many milliliters are in an imperial fluid ounce?
One imperial fluid ounce equals approximately 28.413 mL. One US fluid ounce equals approximately 29.574 mL. Both round to roughly "30 mL" in casual usage, but the precise difference matters in pharmacology.