Convert US tablespoons to US gallons
1 US tablespoon is 0.003906 gal. One US tablespoon is exactly 0.00390625 US gallons.
One US tablespoon is 0.00390625 US gallons. To convert US tablespoons to US gallons, multiply by 0.00390625; to go the other way, divide by 0.00390625 or multiply by 256. The factor is exact rather than rounded: it follows from NIST Handbook 130. Three teaspoons, about 14.79 ml.
Factor checked against the defining standard · How we check
- US tablespoons × 0.00390625
1 * 0.00390630.004 gal
1 US tablespoon in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 3 tsp | × 3 |
| US tablespoons (as entered) | 1 tbsp | — |
| US fluid ounces | 0.5 fl oz | × 0.5 |
| US cups | 0.0625 cup | × 0.0625 |
| US pints | 0.03125 pt | × 0.03125 |
| US quarts | 0.015625 qt | × 0.015625 |
| US gallons | 0.00390625 gal | × 0.00390625 |
| milliliters | 14.78676478 ml | × 14.7867647812 |
| liters | 0.01478676478 L | × 0.0147867647812 |
| imperial gallons | 0.003252633534 gal (UK) | × 0.00325263353371 |
| imperial quarts | 0.01301053413 qt (UK) | × 0.0130105341348 |
| imperial pints | 0.02602106827 pt (UK) | × 0.0260210682697 |
| imperial fluid ounces | 0.5204213654 fl oz (UK) | × 0.520421365393 |
| imperial gills | 0.1040842731 gi (UK) | × 0.104084273079 |
| cubic millimetres | 14,786.76478 mm³ | × 14,786.7647812 |
| cubic centimetres | 14.78676478 cm³ | × 14.7867647812 |
| cubic inches | 0.90234375 in³ | × 0.90234375 |
| cubic feet | 0.0005221896701 ft³ | × 0.000522189670139 |
| cubic yards | 0.00001934035815 yd³ | × 0.0000193403581533 |
| cubic metres | 0.00001478676478 m³ | × 0.0000147867647812 |
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 tablespoons to US gallons? The converter and the working
- 1.Take the measurement in US tablespoons.
- 2.Multiply by 0.00390625 — that is how many US gallons fit in one US tablespoon.
- 3.To go back the other way, divide by 0.00390625, or multiply by 256.
Worked example: 25 US tablespoons to US gallons
- Formula
- tbsp × 0.00390625 = gal
- Arithmetic
- 25 × 0.00390625 = 0.1 gal
- Answer
- 25 tbsp = 0.1 gal
The factor is exact, so this figure is exact too — only the display is rounded.
US tablespoons to US gallons conversion table
| US tablespoons | US gallons |
|---|---|
| 1 tbsp | 0.003906 gal |
| 2 tbsp | 0.01 gal |
| 3 tbsp | 0.01 gal |
| 4 tbsp | 0.02 gal |
| 5 tbsp | 0.02 gal |
| 6 tbsp | 0.02 gal |
| 7 tbsp | 0.03 gal |
| 8 tbsp | 0.03 gal |
| 9 tbsp | 0.04 gal |
| 10 tbsp | 0.04 gal |
| 12 tbsp | 0.05 gal |
| 15 tbsp | 0.06 gal |
| 20 tbsp | 0.08 gal |
| 25 tbsp | 0.1 gal |
| 50 tbsp | 0.2 gal |
| 100 tbsp | 0.39 gal |
| 200 tbsp | 0.78 gal |
| 300 tbsp | 1.17 gal |
| 500 tbsp | 1.95 gal |
| 1000 tbsp | 3.91 gal |
| 2000 tbsp | 7.81 gal |
| 5000 tbsp | 19.53 gal |
| 10000 tbsp | 39.06 gal |
What is a US tablespoon?
Three teaspoons, about 14.79 ml. Australia is the outlier at four teaspoons to the tablespoon.
What is a US gallon?
Exactly 231 cubic inches. The imperial gallon is 4.546 liters, so US and UK fuel economy figures are not comparable.
How many US gallons are in a US tablespoon?
One US tablespoon is 0.00390625 US gallons, exactly. Going the other way, one US gallon is 256 US tablespoons. 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 tablespoon.
Cite this page
- APA
- Rule Calculator. (2026). Convert US tablespoons to US gallons. Rule Calculator. https://rulecalculators.com/convert/tablespoon-to-gallon
- MLA
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- Chicago
- Rule Calculator. "Convert US tablespoons to US gallons." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/tablespoon-to-gallon.
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Questions people actually ask
- How many US gallons are in a US tablespoon?
- 0.00390625. Exactly 231 cubic inches. The imperial gallon is 4.546 liters, so US and UK fuel economy figures are not comparable.
- How do I convert US gallons back to US tablespoons?
- Divide by 0.00390625, or multiply by 256 — they are the same operation.
Other volume conversions
US gallons to US tablespoons — the same conversion the other way.