A US tablespoon is half a US fluid ounce.
Tablespoons to Imperial fluid ounces Converter — tbsp to imp fl oz
Convert Tablespoon (tbsp) to Imperial fluid ounce (imp fl oz) using the exact conversion factor (1 tablespoon = 0.5204213654 imperial fluid ounce). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Tablespoons to Imperial fluid ounces converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
An imperial fluid ounce is 1/160 of an imperial gallon.
Result = input x 1.47867648e-5 / 2.84130625e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Tablespoons to Imperial fluid ounces
Tablespoon and Imperial fluid ounce appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Tablespoon is typically associated with united States (cooking and recipe measurement), while Imperial fluid ounce is typically associated with united Kingdom (historically; less common in current UK retail than metric units).
Formula
imperial fluid ounces = tablespoons × 0.520421365393
This factor comes from each unit's defined relationship to the category's base unit: 1 tablespoon equals 0.0000147867647813 base units, and 1 imperial fluid ounce equals 0.0000284130625 base units, so dividing one by the other gives the direct tablespoon-to-imperial fluid ounce factor of 0.520421365393.
Simple example
1 tbsp × 0.5204213654 = 0.5204213654 imp fl oz
1 tablespoon = 0.5204213654 imperial fluid ounces.
Real-world example
10 tbsp × 0.5204213654 = 5.204213654 imp fl oz
10 tablespoons = 5.204213654 imperial fluid ounces.
Conversion table
| Tablespoon (tbsp) | Imperial fluid ounce (imp fl oz) |
|---|---|
| 1 tbsp | 0.5204213654 imp fl oz |
| 5 tbsp | 2.602106827 imp fl oz |
| 10 tbsp | 5.204213654 imp fl oz |
| 25 tbsp | 13.01053413 imp fl oz |
| 50 tbsp | 26.02106827 imp fl oz |
| 100 tbsp | 52.04213654 imp fl oz |
Reverse conversion: Imperial fluid ounce to Tablespoon
0.5204213654 imp fl oz × 1.921519881 = 1 tbsp
0.5204213654 imperial fluid ounces = 1 tablespoons.
tablespoons = imperial fluid ounces × 1.92151988081
For a page dedicated to this direction, see Imperial fluid ounce to Tablespoon.
Tablespoon vs. Imperial fluid ounce
| Aspect | Tablespoon | Imperial fluid ounce |
|---|---|---|
| Family | US customary unit | UK/imperial customary unit |
| Typical use | US recipe and cooking measurement | UK/Commonwealth beverage measurement in historical or specialized contexts |
| Where it's used | United States (cooking and recipe measurement) | United Kingdom (historically; less common in current UK retail than metric units) |
Understanding the Tablespoon
Tablespoon (tbsp) measures volume. The US tablespoon is exactly 14.78676478125 milliliters — 3 US teaspoons, or 1/16 of a US cup. It is classified as a US customary unit.
Where it's used: United States (cooking and recipe measurement)
Uses of the Tablespoon today
- US recipe and cooking measurement
- Nutrition labeling serving sizes in the US
- Medication dosing instructions in the US
Understanding the Imperial fluid ounce
Imperial fluid ounce (imp fl oz) measures volume. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom (historically; less common in current UK retail than metric units)
Imperial fluid ounce vs. US fluid ounce. Confusingly, the imperial fluid ounce (28.41 mL) is slightly smaller than the US fluid ounce (29.57 mL), even though the imperial gallon is larger overall — because the imperial gallon is divided into 160 fluid ounces rather than the US gallon's 128.
Uses of the Imperial fluid ounce today
- UK/Commonwealth beverage measurement in historical or specialized contexts
History of the Imperial fluid ounce
The imperial fluid ounce follows from Britain's 1824 imperial gallon, divided into 160 parts rather than the 128 used in the US system, producing its counterintuitively smaller size relative to the US fluid ounce.
Historical origin. Imperial fluid ounce was not the invention of a single named person; it developed through the process described above.
Tablespoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US tablespoon definition.
Imperial fluid ounce — sources
- UK Weights and Measures Act 1824 — Basis for the imperial fluid ounce via the imperial gallon.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial fluid ounces are in 1 tablespoon?
1 tablespoon equals 0.5204213654 imperial fluid ounces, using the exact defined conversion factor rather than an estimate.
How do I convert tablespoon to imperial fluid ounce?
Multiply the tablespoon value by 0.5204213654. The converter above does this instantly to whatever precision you set.
How do I convert imperial fluid ounce back to tablespoon?
Use the reverse factor: 1 imperial fluid ounce equals 1.921519881 tablespoons. You can also use the swap control in the converter above to flip the direction instantly.
What is a tablespoon?
Tablespoon (tbsp) measures volume. The US tablespoon is exactly 14.78676478125 milliliters — 3 US teaspoons, or 1/16 of a US cup. It is classified as a US customary unit.
What is a imperial fluid ounce?
Imperial fluid ounce (imp fl oz) measures volume. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. It is classified as a UK/imperial customary unit.
Is the tablespoon to imperial fluid ounce conversion exact?
Yes. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between imperial fluid ounce vs. us fluid ounce?
Confusingly, the imperial fluid ounce (28.41 mL) is slightly smaller than the US fluid ounce (29.57 mL), even though the imperial gallon is larger overall — because the imperial gallon is divided into 160 fluid ounces rather than the US gallon's 128.
Where is the tablespoon still used today?
United States (cooking and recipe measurement)