What is teaspoon (metric)?

A metric teaspoon is a volume unit equal to exactly 5 millilitres. It is a standard unit in cooking recipes and pharmaceutical dosing instructions across metric countries.

Real-world uses

The metric teaspoon (5 mL) is used in cooking recipes, pharmaceutical dosing instructions, and nutrition labelling. It is the standard dosing spoon for children's liquid medicines. Most international recipes specify teaspoon measurements assuming the 5 mL metric standard.

History

The teaspoon originated as a unit of apothecary measure in the 18th century, roughly the volume of a small spoon used to stir tea. The metric teaspoon was standardized at exactly 5 mL to align with the metric system and simplify pharmaceutical dosing.

Common mistakes

Confusing the metric teaspoon (5 mL) with the US customary teaspoon (4.929 mL) or the older Imperial teaspoon (3.55 mL). Also, using a household spoon instead of a measuring spoon—actual spoons vary widely in size.

What is Imperial fluid ounce?

An Imperial fluid ounce is a volume unit used in the United Kingdom equal to approximately 28.41 millilitres. It is used in British cooking recipes, beverage servings, and pharmaceutical labelling.

Real-world uses

Imperial fluid ounces are used in the United Kingdom, Canada (in some contexts), and other Commonwealth countries for beverage serving sizes and recipe measurements. A British pint is 20 Imperial fluid ounces, compared to the US pint of 16 US fluid ounces.

History

The Imperial fluid ounce was defined by the British Weights and Measures Act of 1824, which established the Imperial gallon based on the volume of 10 pounds of water at 62°F. One Imperial fluid ounce is 1/160 of that gallon.

Common mistakes

Assuming Imperial and US fluid ounces are the same. An Imperial fluid ounce is about 28.41 mL versus 29.57 mL for the US version. This means an Imperial pint (568 mL) is larger than a US pint (473 mL).

When is this conversion used?

Converting teaspoon (metric) to Imperial fluid ounce is useful in the volume domain when comparing values across different measurement standards or applying formulas that require a specific unit.

Worked examples

1 teaspoon (metric) = 0.1759754 Imperial fluid ounce

1 Imperial fluid ounce = 0.02841306 litre

How to convert teaspoon (metric) to Imperial fluid ounce

To convert teaspoon (metric) to Imperial fluid ounce, multiply the value by 0.1759754.

To convert Imperial fluid ounce back to teaspoon (metric), multiply by 5.6826125.

Measurement standards

The cubic metre is the SI derived unit of volume. The litre, equal to exactly one cubic decimetre (0.001 m³), is accepted by the BIPM for use alongside SI units. Both the lowercase "l" and uppercase "L" are approved symbols for the litre.

Did you know?

An Olympic swimming pool holds 2,500 cubic metres of water — about 2.5 million litres. The Amazon River discharges roughly 209,000 cubic metres per second, enough to fill 84 Olympic pools every single second.

Quick reference: teaspoon (metric) to Imperial fluid ounce

Common values

Available Volume units

• litre conversions
• millilitre conversions
• US gallon conversions
• cubic metre conversions
• Imperial gallon conversions
• US fluid ounce conversions
• Imperial fluid ounce conversions
• teaspoon (metric) conversions
• tablespoon (metric) conversions
• cubic centimetre conversions

More teaspoon (metric) conversions

• Convert teaspoon (metric) to litre
• Convert teaspoon (metric) to millilitre
• Convert teaspoon (metric) to US gallon
• Convert teaspoon (metric) to cubic metre
• Convert teaspoon (metric) to Imperial gallon
• Convert teaspoon (metric) to US fluid ounce
• Convert teaspoon (metric) to Imperial fluid ounce
• Convert teaspoon (metric) to tablespoon (metric)
• Convert teaspoon (metric) to cubic centimetre