Gal to Ft³ Converter – US gallons to cubic feet

This converter applies the exact factor 1 US gallon = 0.133680556 cubic feet. Multiply any value in US gallons by 0.133680556 to get cubic feet: the worked example 10 gal × 0.133680556 = 1.34 ft³ shows the arithmetic in a single line. Liters and milliliters rule the metric kitchen and fuel pump, while US gallons, cups and fluid ounces fill American recipes, gas stations and bottle labels — and the imperial gallon used in the UK is a third system again. Every US liquid unit in this converter derives from the exact gallon of 3.785411784 L, so results are definition-exact: 1 fl oz = 29.5735295625 mL and 1 cup = 236.5882365 mL. For reverse conversions divide by 0.133680556 instead — identical to multiplying by 7.4805195 — for example 1.34 ft³ ≈ 10.02 gal. Quick mini table: 1 gal = 0.133681 ft³; 5 gal = 0.668403 ft³; 10 gal = 1.34 ft³; 50 gal = 6.68 ft³; 100 gal = 13.37 ft³. Spot-check with fuel: a 15 US-gallon tank is about 56.8 L, and a 500 mL bottle is 16.9 fl oz — two anchors that expose a US/UK gallon mix-up immediately.

1. 1

   Step 1

   Enter your value in US gallons (gal)

2. 2

   Step 2

   The converter multiplies it by the exact factor 0.133680556

3. 3

   Step 3

   Read the result in cubic feet (ft³)

4. 4

   Step 4

   Hit swap to convert cubic feet back to US gallons instantly

• 1

  Fuel anchor: 10 US gal ≈ 37.9 L; 50 L ≈ 13.2 US gal

• 2

  Baking: halve a cup = 16 tbsp = 236.6/2 mL

• 3

  A 750 mL wine bottle is exactly 25.4 fl oz

• 4

  UK mpg figures divide by 1.2 before comparing to US mpg

• Using the imperial gallon (4.546092 L) where a US gallon (3.7854118 L) is meant — a 20% error

• Confusing the fluid ounce (volume) with the avoirdupois ounce (28.35 g mass)

• Assuming a "cup" is metric (250 mL) when the recipe is American (236.6 mL)