Convert US Teaspoon to Cubic Inch
Convert us teaspoons to cubic inches instantly. 1 us teaspoon = 0.30078125 cubic inch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Cubic Inch to US Teaspoon converter for the reverse conversion.
Units explained
US Teaspoon
A US teaspoon is one third of a US tablespoon (4.9289 mL).
A standardized small cooking measure.
Used everywhere in US recipes and home dosing.
US cooking measure.
Cubic Inch
A cubic inch is the volume of a cube one inch on a side (16.387 mL).
Derived by cubing the international inch (25.4 mm).
Used for engine displacement and small-part volumes.
1959 yard agreement.
US Teaspoon to Cubic Inch conversion formula
The relationship between us teaspoons and cubic inches:
To convert us teaspoons to cubic inches, multiply the value in us teaspoons by 0.30078125. To reverse, multiply cubic inches by 3.3246753247.
How to use this converter
Type a value into the calculator. The result in cubic inches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Cubic Inch to US Teaspoon converter for the reverse direction.
Step-by-step: convert us teaspoons to cubic inches
- Write down the value in us teaspoons (tsp).
- Multiply that value by the factor 0.30078125.
- The product is the equivalent value in cubic inches (in³).
- To reverse, multiply the cubic inch value by 3.3246753247.
Worked examples
Example 1 — Convert 1 tsp to in³:
1 × 0.30078125 = 0.30078125 in³
Example 2 — Convert 100 tsp to in³:
100 × 0.30078125 = 30.078125 in³
Real-world example — Plastic-film thickness alternates
A 150-us teaspoon plastic film converts cleanly to cubic inches — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 tsp × 0.30078125 = 45.1171875 in³
Real-world example — Hair-width scale measurements
A 70-us teaspoon measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like cubic inches for direct comparison across supplier datasheets.
70 tsp × 0.30078125 = 21.0546875 in³
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 us teaspoons), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 tsp × 0.30078125 = 0.90234375 in³
US Teaspoon to Cubic Inch conversion table
Standard reference values for converting us teaspoons to cubic inches:
| US Teaspoon [tsp] | Cubic Inch [in³] |
|---|---|
| 0.01 | 0.0030078125 |
| 0.1 | 0.030078125 |
| 1 | 0.30078125 |
| 2 | 0.6015625 |
| 3 | 0.90234375 |
| 4 | 1.203125 |
| 5 | 1.50390625 |
| 10 | 3.0078125 |
| 20 | 6.015625 |
| 30 | 9.0234375 |
| 40 | 12.03125 |
| 50 | 15.0390625 |
| 100 | 30.078125 |
| 500 | 150.390625 |
| 1000 | 300.78125 |
Frequently asked questions
How many cubic inches is 1 us teaspoon?
How do I convert us teaspoons to cubic inches?
How do I convert cubic inches back to us teaspoons?
How many cubic inches is 100 us teaspoons?
Popular volume unit conversions
Convert US Teaspoon to other volume units
Show all US Teaspoon conversions
Metric / SI (8 units)
US Customary (Liquid) (7 units)
Imperial (UK) (4 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 tsp = 0.30078125 in³) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.