A US tablespoon is half a US fluid ounce.
Tablespoons to Cubic inches Converter — tbsp to in3
Convert Tablespoon (tbsp) to Cubic inch (in3) using the exact conversion factor (1 tablespoon = 0.90234375 cubic inch). See the formula, worked examples, conversion table, and common uses.
Tablespoons to Cubic inches 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.
A cubic inch is the volume of a one-inch cube.
Result = input x 1.47867648e-5 / 1.6387064e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Tablespoons to Cubic inches
Tablespoon and Cubic inch 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 most often used for us recipe and cooking measurement.
Formula
cubic inches = tablespoons × 0.90234375
This factor comes from each unit's defined relationship to the category's base unit: 1 tablespoon equals 0.0000147867647813 base units, and 1 cubic inch equals 0.000016387064 base units, so dividing one by the other gives the direct tablespoon-to-cubic inch factor of 0.90234375.
Simple example
1 tbsp × 0.90234375 = 0.90234375 in3
1 tablespoon = 0.90234375 cubic inches.
Real-world example
10 tbsp × 0.90234375 = 9.0234375 in3
10 tablespoons = 9.0234375 cubic inches.
Conversion table
| Tablespoon (tbsp) | Cubic inch (in3) |
|---|---|
| 1 tbsp | 0.90234375 in3 |
| 5 tbsp | 4.51171875 in3 |
| 10 tbsp | 9.0234375 in3 |
| 25 tbsp | 22.55859375 in3 |
| 50 tbsp | 45.1171875 in3 |
| 100 tbsp | 90.234375 in3 |
Reverse conversion: Cubic inch to Tablespoon
0.90234375 in3 × 1.108225108 = 1 tbsp
0.90234375 cubic inches = 1 tablespoons.
tablespoons = cubic inches × 1.10822510823
For a page dedicated to this direction, see Cubic inch to Tablespoon.
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 Cubic inch (in3)
A cubic inch is the volume of a one-inch cube.
Tablespoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US tablespoon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic inches are in 1 tablespoon?
1 tablespoon equals 0.90234375 cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert tablespoon to cubic inch?
Multiply the tablespoon value by 0.90234375. The converter above does this instantly to whatever precision you set.
How do I convert cubic inch back to tablespoon?
Use the reverse factor: 1 cubic inch equals 1.108225108 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 cubic inch?
Cubic inch (in3) is a unit of volume.
Is the tablespoon to cubic inch conversion exact?
Yes. The US tablespoon is exactly 14.78676478125 milliliters — 3 US teaspoons, or 1/16 of a US cup. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the tablespoon still used today?
United States (cooking and recipe measurement)