Convert Tablespoon to US Gallon (tbsp → gal (US))

Converting tablespoons to US gallons is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in tablespoons

   Start with the number of tablespoons (tbsp) you want to convert.
2. 2
   Multiply by 0.00391

   The conversion factor from tbsp to gal (US) is 0.00391. Multiply your value by this number.
3. 3
   Read the result in US gallons

   The result is your value in US gallons (gal (US)).

Multiply the value in tablespoons by 0.00391. For the reverse direction, multiply by 255.77107.

• ✓US tbsp = 15 ml (practical); 14.787 ml (legal); 3 teaspoons in any system.
• ✓Australian tablespoon = 20 ml — 33% larger. Adjust when using Australian recipes.
• ✓For accurate cooking, weigh dry ingredients rather than measuring by tablespoon.

• ✗Using an Australian tablespoon (20 ml) for a US recipe (15 ml) — 33% overshoot.
• ✗Treating teaspoon and tablespoon as interchangeable — tablespoon is 3× larger.
• ✗Using a dinner spoon from the cutlery drawer as a tablespoon — they vary widely.

What is the Tablespoon?

The tablespoon equals exactly 15 milliliters (international culinary standard) or about 14.787 mL (US strict definition based on ½ fluid ounce). The tablespoon is a near-universal cooking measure for ingredients larger than a teaspoon but smaller than a cup — typical uses include oils, sauces, and condiments. The Australian tablespoon is uniquely 20 mL (4 teaspoons rather than 3), an oddity in international recipe interpretation. Standard recipes assume 1 tbsp = 15 mL globally except in Australia and the United States (where it is sometimes 14.787 mL but commonly rounded to 15 mL). The tablespoon relates to the teaspoon (3 tsp = 1 tbsp), the cup (16 tbsp = 1 cup), the fluid ounce (2 tbsp = 1 US fl oz), and the milliliter (1 tbsp = 15 mL conventional). Measuring spoons are calibrated to the local convention.

• Cooking recipes worldwide (dominantly US 15 ml)
• Nutrition-label serving sizes
• Over-the-counter liquid-medication doses

What is the US Gallon?

The US liquid gallon equals exactly 3.785411784 liters and is the standard volume unit for fuel, beverages, milk, and household liquids in the United States. Defined as 231 cubic inches, the US gallon descends from the English wine gallon of 1707, which Britain replaced with the larger imperial gallon in 1824 — a divergence that left the United States with a different gallon than the rest of the English-speaking world. American gas stations price gasoline by the gallon (typical fill-up: 12–15 gallons), milk is sold in half-gallons and gallons, and many beverages come in fluid-ounce subdivisions of the gallon. The US gallon relates to the liter (1 gal ≈ 3.785 L), the quart (4 qt = 1 gal), the pint (8 pt = 1 gal), the cup (16 cups = 1 gal), and the imperial gallon (1 imp gal ≈ 1.201 US gal — about 20% larger).

• US fuel pricing and consumption
• US paint, oil and cleaning-product packaging
• US beverage containers (1-gallon jugs of milk)