Convert 18 tbsp to gal

How to convert tablespoons to US gallons

1. Formula: US gallons = tablespoons × 0.00390625
2. Put in the value: 18 tablespoons.
3. Result: 0.0703125 US gallons.

Tablespoons to US gallons table

Converting the other way: US gallons to tablespoons

tablespoons = US gallons × 256. So 0.0703125 US gallons is back to 18 tablespoons; one US gallon is 256 tablespoons. See the US gallons to tablespoons table.

Quick estimate in your head

For a rough answer, multiply by about 0.004: 18 × 0.004 ≈ 0.072 gal, against the exact 0.0703125 gal (2.4% out). Good enough to check that a calculated result is sensible.

Common mistakes

The usual slip is using the factor the wrong way round. A tablespoon is smaller than a US gallon, so the number of US gallons must come out smaller than the number of tablespoons. If your answer goes the other way, divide instead of multiplying.

About the units

Tablespoon (tbsp) and US gallon (gal) are both units of volume. One tablespoon equals 0.00390625 US gallons, and one US gallon equals 256 tablespoons. Results on this page are rounded for display; the conversion itself uses the exact definitions.

Volume conversions come up in recipes, fuel economy, drink and bottle sizes, garden and pool water, and engine sizes.

18 tablespoons in other units

The most readable unit for this amount is US cups (1.125).

• 266.161766 ml
• 0.26616177 l
• 0.00026616 m3
• 54 tsp
• 9 floz
• 1.125 cup
• 0.5625 pt
• 0.28125 qt
• 0.0703125 gal
• 0.0585474 impgal