US fluid ounce to Imperial teaspoon
us fl oz
imp tsp
Conversion History
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Quick Reference Table (US fluid ounce to Imperial teaspoon)
| US fluid ounce (us fl oz) | Imperial teaspoon (imp tsp) |
|---|---|
| 0.5 | 2.4980225538206657724 |
| 1 | 4.9960451076413315448 |
| 1.5 | 7.4940676614619973172 |
| 8 | 39.96836086113065235841 |
| 12 | 59.95254129169597853762 |
| 16 | 79.93672172226130471682 |
| 32 | 159.87344344452260943365 |
About US fluid ounce (us fl oz)
The US fluid ounce (fl oz) is a unit of volume equal to approximately 29.574 milliliters, one sixteenth of a US liquid pint. It is the primary small-volume unit on US food labels, beverage cans, and pharmaceutical liquid measurements. A standard US soda can is 12 fl oz; a coffee shop "tall" is 12 fl oz; a standard shot is 1.5 fl oz. The US fluid ounce is distinct from the imperial fluid ounce (28.413 mL) and should not be confused with the ounce as a unit of mass.
A US soda can is 12 fl oz (355 mL). A US shot glass holds 1.5 fl oz (44 mL). A US water bottle is commonly 16.9 fl oz (500 mL).
About Imperial teaspoon (imp tsp)
The imperial teaspoon is a unit of volume equal to approximately 5.919 milliliters, one third of an imperial tablespoon. It is larger than the US teaspoon (4.929 mL) and the metric teaspoon (5 mL). It appears in pre-metrication British and Commonwealth recipes. In medicine and pharmacology, both the UK and US have standardized on the 5 mL metric teaspoon for dosing, replacing all customary teaspoon sizes. Modern UK recipes do not use the imperial teaspoon.
Pre-metrication British recipes called for teaspoons of approximately 5.92 mL. A standard UK medicine teaspoon is now 5 mL (metric).
US fluid ounce – Frequently Asked Questions
What is the difference between a fluid ounce and an ounce?
A fluid ounce (fl oz) is a unit of volume; an ounce (oz) is a unit of mass/weight. One US fluid ounce of water happens to weigh approximately 1.04 avoirdupois ounces — close but not equal. For other liquids, the mass per fl oz varies with density.
How many fluid ounces are in a US cup?
There are exactly 8 US fluid ounces in one US cup (240 mL). A pint is 16 fl oz, a quart is 32 fl oz, and a gallon is 128 fl oz.
What is the difference between US and imperial fluid ounces?
A US fluid ounce is approximately 29.574 mL; an imperial (UK) fluid ounce is approximately 28.413 mL — about 4% smaller. A US pint (16 fl oz) is 473 mL while a UK pint (20 fl oz) is 568 mL, a 20% difference that significantly affects beverage serving sizes.
How many fluid ounces are in a standard water bottle?
The most common US bottled water size is 16.9 fl oz (500 mL). Other sizes include 8 fl oz (237 mL), 20 fl oz (591 mL), and 33.8 fl oz (1 liter).
How many fl oz are in a standard US wine pour?
A standard US restaurant wine pour is 5 fl oz (148 mL). A 750 mL wine bottle yields approximately 5 pours of 5 fl oz each.
Imperial teaspoon – Frequently Asked Questions
How many milliliters is an imperial teaspoon?
One imperial teaspoon equals approximately 5.919 mL — slightly larger than the US teaspoon (4.929 mL) and the metric teaspoon (5 mL).
What is the difference between an imperial and a metric teaspoon?
An imperial teaspoon is approximately 5.92 mL; a metric teaspoon is exactly 5 mL. The metric teaspoon is now standard in UK cooking, medicine, and pharmacology.
Is the imperial teaspoon used today?
The imperial teaspoon is obsolete in modern UK, Australian, and Canadian cooking, which all use the 5 mL metric teaspoon. It may appear in cookbooks published before the 1970s metrication period.
Why is a "pinch" of salt not as vague as it sounds?
A culinary pinch — the amount you can hold between thumb and forefinger — is roughly 0.3–0.5 mL, or about 1/16 of a teaspoon. Professional recipe developers have measured this and found surprising consistency across people: the human fingertip geometry constrains how much fine powder you can grip. A "dash" (liquid) is about 0.6 mL, and a "smidgen" is half a pinch (~0.15 mL). These folksy terms survive in recipes because they map to real, repeatable volumes — within the tolerance that salt and spice measurements actually require.
Why did the UK standardize on 5 mL for medicine teaspoons?
The WHO recommended the 5 mL metric teaspoon for medication dosing in the 1970s to eliminate ambiguity between imperial (5.92 mL), US (4.93 mL), and other teaspoon sizes. A calibrated 5 mL oral syringe is now the recommended tool for all liquid medicines.