US Gallon to US Cup Conversion Chart
| US Gallon (gallon) | US Cup (cup) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.25 gallon | 3.94314 cup | One-US-Quart Culinary Saucepan Measurement Volume | 0.25 × 15.77255 = 3.94314 cup-us |
| 0.5 gallon | 7.88627 cup | Two-US-Quart Pitcher Domestic Beverage Vessel | 0.5 × 15.77255 = 7.88627 cup-us |
| 0.75 gallon | 11.82941 cup | Three-Quart Heavy Enamel Kitchen Dutch Oven | 0.75 × 15.77255 = 11.82941 cup-us |
| 1 gallon | 15.77255 cup | Standard One-Gallon Whole Milk Polyethylene Jug | 1 × 15.77255 = 15.77255 cup-us |
| 1.25 gallon | 19.71569 cup | Five-Quart Automotive Oil Sump Service Capacity | 1.25 × 15.77255 = 19.71569 cup-us |
| 1.5 gallon | 23.65882 cup | Six-Quart Electric Multi-Cooker Pressure Vessel | 1.5 × 15.77255 = 23.65882 cup-us |
| 2 gallon | 31.5451 cup | Two-Gallon Garden Fertilizer Hand-Pump Jug | 2 × 15.77255 = 31.5451 cup-us |
| 2.5 gallon | 39.43137 cup | Two-and-a-Half-Gallon Emergency Drinking Water Jug | 2.5 × 15.77255 = 39.43137 cup-us |
| 3 gallon | 47.31765 cup | Three-Gallon Commercial Countertop Beverage Urn | 3 × 15.77255 = 47.31765 cup-us |
| 4 gallon | 63.0902 cup | Four-Gallon Agricultural Backpack Spraying System | 4 × 15.77255 = 63.0902 cup-us |
| 5 gallon | 78.86275 cup | Standard Five-Gallon Construction Joint Compound Pail | 5 × 15.77255 = 78.86275 cup-us |
| 6 gallon | 94.63529 cup | Six-Gallon Marine Fuel Portable Outboard Tank | 6 × 15.77255 = 94.63529 cup-us |
| 8 gallon | 126.18039 cup | Eight-Gallon Commercial Wet-Vacuum Recovery Tank | 8 × 15.77255 = 126.18039 cup-us |
| 10 gallon | 157.72549 cup | Ten-Gallon Residential Aquarium Water Volume Tank | 10 × 15.77255 = 157.72549 cup-us |
| 15 gallon | 236.58824 cup | Fifteen-Gallon Compact Sedan Fuel Storage Tank | 15 × 15.77255 = 236.58824 cup-us |
US Gallon to US Cup Formula & Unit Definitions
One US liquid gallon equals approximately 15.77255 US legal cups (3.78541178 / 0.24). To convert US gallons to US cups, multiply by 15.77255. Conversely, to convert US cups to US gallons, divide by 15.77255 (or multiply by 0.0634013).
Quick Estimation: One gallon is roughly 16 cups. Multiply gallons by 16 for a quick culinary estimate. For exact FDA nutrition calculations, use 15.77.
US Liquid Gallon Scale (gal)
US Statutory Liquid Unit- Creator & Origin: Derived from the Queen Anne wine gallon established in England in 1707.
- Standard Definition: Defined by NIST as exactly 231 cubic inches (3.785411784 liters).
- Everyday Focus: Gasoline dispensing, dairy milk jugs, paint buckets, and chemical drums.
US Legal Cup Scale (cup)
FDA Statutory Nutritional Unit- Creator & Origin: Codified by the US FDA for standardized nutritional serving sizes.
- Standard Definition: Statutorily defined as exactly 240 cubic centimeters (240 mL).
- Everyday Focus: Baking ingredients, nutritional facts panels, and milk servings.
Frequently Asked Questions
Q.How many US cups are in one US liquid gallon?
One US liquid gallon equals approximately 15.77255 FDA legal cups (240 mL each) or exactly 16 traditional US customary cups (236.59 mL each).
Q.What is the formula to convert US gallons to US cups?
The formula is: US Cups = US Gallons × 15.77255. For example, 2 gal × 15.77255 ≈ 31.55 cups.
Q.How do I reverse this calculation from US cups to US gallons?
To convert US cups back to US gallons, divide by 15.77255 (or multiply by 0.0634013). You can also use our US Cup to US Gallon Converter.
Q.Why are there 15.77 legal cups in a gallon instead of 16?
Because the FDA defines the legal nutrition cup as exactly 240 mL rather than the customary 236.588 mL (1/16th of a gallon), creating a slight statutory difference of about 1.4%.