Imperial tablespoon to Cubic inch
imp tbsp
in³
Conversion History
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Quick Reference Table (Imperial tablespoon to Cubic inch)
| Imperial tablespoon (imp tbsp) | Cubic inch (in³) |
|---|---|
| 0.5 | 0.54183482966696474732 |
| 1 | 1.08366965933392949463 |
| 2 | 2.16733931866785898926 |
| 4 | 4.33467863733571797852 |
| 8 | 8.66935727467143595705 |
| 16 | 17.33871454934287191409 |
About Imperial tablespoon (imp tbsp)
The imperial tablespoon is a unit of volume equal to approximately 17.758 milliliters, defined as five-eighths of an imperial fluid ounce. It is used in older UK and Commonwealth cooking recipes. The imperial tablespoon is larger than the US tablespoon (14.787 mL) but smaller than the Australian tablespoon (20 mL). Modern British and Commonwealth recipes have replaced it with the 15 mL metric tablespoon, but it persists in pre-metrication cookbooks.
Older British recipe books specify tablespoons of approximately 17.8 mL — larger than a US tablespoon but smaller than an Australian one.
About Cubic inch (in³)
A cubic inch (in³) is the volume of a cube with 1-inch sides, equal to approximately 16.387 milliliters. In the US, it is used for engine displacement (the classic Chevrolet 350 = 350 in³ ≈ 5.7 L), small container volumes, and pharmaceutical packaging. Car engine displacement was historically described in cubic inches before the automotive industry switched to liters in the 1980s–1990s. The unit also appears in 3D printing and medical device specifications.
A classic Chevy 350 V8 engine displaces 350 in³ (≈ 5.7 L). A standard tennis ball has a volume of about 15 in³.
Imperial tablespoon – Frequently Asked Questions
How many milliliters is an imperial tablespoon?
One imperial tablespoon equals approximately 17.758 mL — larger than the US tablespoon (14.79 mL) and smaller than the Australian tablespoon (20 mL). Modern UK metric tablespoons are standardized at 15 mL.
What is the most common baking disaster caused by tablespoon size confusion?
Leavening failure. Baking powder and baking soda are measured in tablespoons, and the difference between a US tablespoon (14.8 mL), an imperial tablespoon (17.8 mL), and an Australian tablespoon (20 mL) is 15–35%. Too much baking soda makes bread taste metallic and soapy; too little and it does not rise. A British grandmother's scone recipe used in an American kitchen with US tablespoons will under-leaven by 20%. Professional bakers avoid this entirely by weighing leavening agents in grams.
Is the imperial tablespoon still used in UK cooking?
No. Modern UK cooking uses 15 mL metric tablespoons. The imperial tablespoon (17.76 mL) appears only in pre-1970s British cookbooks.
How many imperial teaspoons are in an imperial tablespoon?
One imperial tablespoon equals 3 imperial teaspoons (each ≈ 5.92 mL), giving 3 × 5.92 = 17.76 mL. The same 3:1 ratio as in US and metric systems, though the absolute sizes differ.
What is the standard tablespoon size in Australia?
The Australian tablespoon is 20 mL — the largest of the major English-language cooking tablespoons. Australian recipes therefore use fewer tablespoon counts than US or UK recipes for the same volume.
Cubic inch – Frequently Asked Questions
What is a cubic inch in milliliters?
One cubic inch equals approximately 16.387 mL. This follows from 1 inch = 2.54 cm, so 1 in³ = 2.54³ cm³ = 16.387 cm³ = 16.387 mL.
Why are car engines measured in cubic inches?
American car engines were historically described in cubic inches of displacement. The 350, 427, and 454 in³ engines are iconic V8 ratings. Most manufacturers switched to liters in the 1980s–1990s, but cubic inches remain part of classic car culture.
How many cubic inches are in a liter?
One liter equals approximately 61.024 cubic inches. A 350 in³ engine is approximately 5.74 liters.
What is cubic inch used for today?
Cubic inches are still used in the US for motorcycle and small engine displacement, small packaging volumes, and some industrial contexts. 3D printer filament usage is sometimes estimated in cubic inches.
How does cubic inch relate to fluid ounce?
One US fluid ounce equals approximately 1.805 cubic inches. One cubic inch equals about 0.554 US fluid ounces. These conversions are used in packaging design and liquid container manufacturing.