Tablespoons to Gallons
An instant tablespoons-to-gallons converter, with the formula and a reference table below.
| Tablespoons | Gallons |
|---|---|
| 1 tbsp | 0.003906 gal |
| 2 tbsp | 0.007812 gal |
| 3 tbsp | 0.011719 gal |
| 5 tbsp | 0.019531 gal |
| 10 tbsp | 0.039062 gal |
| 25 tbsp | 0.097656 gal |
| 50 tbsp | 0.195312 gal |
| 100 tbsp | 0.390625 gal |
How to use
- Enter a value in the Tablespoons field.
- The Gallons figure appears immediately — no button to press.
- Typing in the Gallons field converts back to Tablespoons the same way.
- Use the reference table for the values that come up most often.
Tablespoons to Gallons formula
To convert tablespoons to gallons, multiply by 0.00390625.
gal = tbsp × 0.00390625
Put another way, one tablespoon is exactly 1/256 of a gallon.
Why this factor: the tablespoon and the gallon are both defined against the liter, so dividing one definition by the other gives 0.00390625 directly. Both definitions are set out in full below.
To go the other way, divide by 0.00390625 — or use the Gallons to Tablespoons converter, which is the same calculation reversed.
Worked example
Take 50 tbsp and multiply by the factor 0.00390625: the result is 0.195312 gal.
50 tbsp × 0.00390625 = 0.195312 gal
The converter above does this for any value you type, in either direction.
What is a tablespoon?
A US tablespoon is a standard cooking measure equal to three teaspoons.
Definition: Exactly half a US fluid ounce, so about 14.7868 milliliters.
Where it is used: American recipes, medication dosing instructions, and nutrition labeling.
Worth knowing: Australian tablespoons are 20 mL, not 15 — a real difference when scaling a recipe.
What is a gallon?
A US liquid gallon is the standard large-volume unit in the United States.
Definition: Defined as exactly 231 cubic inches, which works out to exactly 3.785411784 liters.
Where it is used: Fuel sales, milk and beverage containers, and paint in the US.
Worth knowing: The imperial gallon used in the UK and Canada is about 20% larger, at 4.54609 L — so 'miles per gallon' figures are not comparable between the two.
Tablespoons vs Gallons
The tablespoon and the gallon belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many gallons are in a tablespoon?
One tablespoon equals 0.00390625 gallons.
What is the formula to convert tablespoons to gallons?
Multiply the number of tablespoons by 0.00390625. To reverse it, divide by 0.00390625 instead.
How do I convert gallons back to tablespoons?
Divide by 0.00390625, which is the same as multiplying by 256.
How many gallons are in 10 tablespoons?
10 tbsp works out to 0.039062 gal.
Is there anything to watch out for with tablespoons?
Australian tablespoons are 20 mL, not 15 — a real difference when scaling a recipe.
How is the tablespoon defined?
Exactly half a US fluid ounce, so about 14.7868 milliliters.