A US teaspoon is one third of a US tablespoon.
Teaspoons to Cubic inches Converter — tsp to in3
Convert Teaspoon (tsp) to Cubic inch (in3) using the exact conversion factor (1 teaspoon = 0.30078125 cubic inch). See the formula, worked examples, conversion table, and common uses.
Teaspoons 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 4.92892159e-6 / 1.6387064e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Teaspoons to Cubic inches
Teaspoon 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. Teaspoon is most often used for us recipe and cooking measurement for small quantities.
Formula
cubic inches = teaspoons × 0.30078125
This factor comes from each unit's defined relationship to the category's base unit: 1 teaspoon equals 0.00000492892159375 base units, and 1 cubic inch equals 0.000016387064 base units, so dividing one by the other gives the direct teaspoon-to-cubic inch factor of 0.30078125.
Simple example
1 tsp × 0.30078125 = 0.30078125 in3
1 teaspoon = 0.30078125 cubic inches.
Real-world example
10 tsp × 0.30078125 = 3.0078125 in3
10 teaspoons = 3.0078125 cubic inches.
Conversion table
| Teaspoon (tsp) | Cubic inch (in3) |
|---|---|
| 1 tsp | 0.30078125 in3 |
| 5 tsp | 1.50390625 in3 |
| 10 tsp | 3.0078125 in3 |
| 25 tsp | 7.51953125 in3 |
| 50 tsp | 15.0390625 in3 |
| 100 tsp | 30.078125 in3 |
Reverse conversion: Cubic inch to Teaspoon
0.30078125 in3 × 3.324675325 = 1 tsp
0.30078125 cubic inches = 1 teaspoon.
teaspoons = cubic inches × 3.32467532468
For a page dedicated to this direction, see Cubic inch to Teaspoon.
Understanding the Teaspoon
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 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 Teaspoon today
- US recipe and cooking measurement for small quantities
- Medication dosing instructions in the US
- Baking measurement alongside the tablespoon and cup
Understanding the Cubic inch (in3)
A cubic inch is the volume of a one-inch cube.
Teaspoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US teaspoon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic inches are in 1 teaspoon?
1 teaspoon equals 0.30078125 cubic inches, using the exact defined conversion factor rather than an estimate.
How do I convert teaspoon to cubic inch?
Multiply the teaspoon value by 0.30078125. The converter above does this instantly to whatever precision you set.
How do I convert cubic inch back to teaspoon?
Use the reverse factor: 1 cubic inch equals 3.324675325 teaspoons. You can also use the swap control in the converter above to flip the direction instantly.
What is a teaspoon?
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 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 teaspoon to cubic inch conversion exact?
Yes. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 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 teaspoon still used today?
United States (cooking and recipe measurement)