Convert US teaspoons to Cubic inches
1 US teaspoon is 0.3 in³. One US teaspoon is exactly 0.30078125 cubic inches.
One US teaspoon is 0.30078125 cubic inches. To convert US teaspoons to cubic inches, multiply by 0.30078125; to go the other way, divide by 0.30078125 or multiply by 3.3246753. The factor is exact rather than rounded: it follows from NIST Handbook 130. One third of a tablespoon, about 4.93 ml.
Factor checked against the defining standard · How we check
- US teaspoons × 0.30078125
1 * 0.30078130.301 in³
1 US teaspoon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons (as entered) | 1 tsp | — |
| US tablespoons | 0.3333333333 tbsp | × 0.333333333333 |
| US fluid ounces | 0.1666666667 fl oz | × 0.166666666667 |
| US cups | 0.02083333333 cup | × 0.0208333333333 |
| US pints | 0.01041666667 pt | × 0.0104166666667 |
| US quarts | 0.005208333333 qt | × 0.00520833333333 |
| US gallons | 0.001302083333 gal | × 0.00130208333333 |
| milliliters | 4.928921594 ml | × 4.92892159375 |
| liters | 0.004928921594 L | × 0.00492892159375 |
| imperial gallons | 0.001084211178 gal (UK) | × 0.0010842111779 |
| imperial quarts | 0.004336844712 qt (UK) | × 0.00433684471161 |
| imperial pints | 0.008673689423 pt (UK) | × 0.00867368942322 |
| imperial fluid ounces | 0.1734737885 fl oz (UK) | × 0.173473788464 |
| imperial gills | 0.03469475769 gi (UK) | × 0.0346947576929 |
| cubic millimetres | 4,928.921594 mm³ | × 4,928.92159375 |
| cubic centimetres | 4.928921594 cm³ | × 4.92892159375 |
| cubic inches | 0.30078125 in³ | × 0.30078125 |
| cubic feet | 0.0001740632234 ft³ | × 0.00017406322338 |
| cubic yards | 0.000006446786051 yd³ | × 0.0000064467860511 |
| cubic metres | 0.000004928921594 m³ | × 0.00000492892159375 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert US teaspoons to cubic inches? The converter and the working
- 1.Take the measurement in US teaspoons.
- 2.Multiply by 0.30078125 — that is how many cubic inches fit in one US teaspoon.
- 3.To go back the other way, divide by 0.30078125, or multiply by 3.3246753.
Worked example: 25 US teaspoons to cubic inches
- Formula
- tsp × 0.30078125 = in³
- Arithmetic
- 25 × 0.30078125 = 7.52 in³
- Answer
- 25 tsp = 7.52 in³
The factor is exact, so this figure is exact too — only the display is rounded.
US teaspoons to cubic inches conversion table
| US teaspoons | Cubic inches |
|---|---|
| 1 tsp | 0.3 in³ |
| 2 tsp | 0.6 in³ |
| 3 tsp | 0.9 in³ |
| 4 tsp | 1.2 in³ |
| 5 tsp | 1.5 in³ |
| 6 tsp | 1.8 in³ |
| 7 tsp | 2.11 in³ |
| 8 tsp | 2.41 in³ |
| 9 tsp | 2.71 in³ |
| 10 tsp | 3.01 in³ |
| 12 tsp | 3.61 in³ |
| 15 tsp | 4.51 in³ |
| 20 tsp | 6.02 in³ |
| 25 tsp | 7.52 in³ |
| 50 tsp | 15.04 in³ |
| 100 tsp | 30.08 in³ |
| 200 tsp | 60.16 in³ |
| 300 tsp | 90.23 in³ |
| 500 tsp | 150.39 in³ |
| 1000 tsp | 300.78 in³ |
| 2000 tsp | 601.56 in³ |
| 5000 tsp | 1,503.91 in³ |
| 10000 tsp | 3,007.81 in³ |
What is a US teaspoon?
One third of a tablespoon, about 4.93 ml. A metric teaspoon is a round 5 ml, which is why recipes rarely notice the difference.
What is a cubic inch?
Exactly 16.387064 millilitres, since the inch is exactly 25.4 mm. American engine displacement was quoted in it until the 1980s — a 350 small block is 5.7 litres.
How many cubic inches are in a US teaspoon?
One US teaspoon is 0.30078125 cubic inches, exactly. Going the other way, one cubic inch is 3.3246753 US teaspoons. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a US teaspoon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US teaspoons to cubic inches. Rule Calculator. https://rulecalculators.com/convert/teaspoon-to-cubic-inch
- MLA
- "Convert US teaspoons to cubic inches." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/teaspoon-to-cubic-inch.
- Chicago
- Rule Calculator. "Convert US teaspoons to cubic inches." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/teaspoon-to-cubic-inch.
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Questions people actually ask
- How many cubic inches are in a US teaspoon?
- 0.30078125. Exactly 16.387064 millilitres, since the inch is exactly 25.4 mm. American engine displacement was quoted in it until the 1980s — a 350 small block is 5.7 litres.
- How do I convert cubic inches back to US teaspoons?
- Divide by 0.30078125, or multiply by 3.3246753 — they are the same operation.
Other volume conversions
Cubic inches to US teaspoons — the same conversion the other way.