How do I convert cups to gallons?
Type either value and the other one updates as you type.
- Gallons (gal)
- 0.0625
1 cup = 0.0625 gal.
Gallons (gal): 0.0625. 1 cup = 0.0625 gal.
Gallons (gal) by cups (cup)
How to calculate
Converts cups (cup) to gallons (gal) and back, with the exact unit definitions.
Example with the default inputs (Cups (cup) 1): 1 cup = 0.0625 gal.
Formula: gal = cup × 0.0625 (the same as cup ÷ 16)
- 1 cup = 0.0625 gallons, from the exact definitions in NIST SP 811.
- Cups, ounces, tablespoons, pints, quarts, and gallons are US customary units: 1 US cup is 8 US fluid ounces.
- The answer shows at most 6 decimal places; the calculation keeps full precision.
Worked examples
Each example is checked against the calculator on every build.
- Cups (cup) 1 gives Gallons (gal) 0.0625.Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Cups (cup) 16 gives Gallons (gal) 1.Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Gallons (gal) 1 gives Cups (cup) 16.Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8
Other questions people ask
How many gallons are in a cup?
1 cup is 0.0625 gallons, from the exact unit definitions (NIST SP 811).
How do I convert cups to gallons?
Multiply by 0.0625: gal = cup × 0.0625 (the same as cup ÷ 16). For example, 1 cup × 0.0625 = 0.0625 gal.
How do I convert gallons back to cups?
Multiply by 16, or type the gallons into the second box and the converter works it out. 1 gallon is 16 cups.