Gallon (US) to Cup (US) Converter
Volume · unit-converter
Convert Gallon (US) to Cup (US) with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use liter-based factors (US fluid measures, imperial UK units, SI cubic meters).
Calculator
From: Gallon (US) (gal)
To: Cup (US) (cup)
About Gallon (US)
The US liquid gallon is defined as 231 cubic inches (about 3.78541 liters). US recipes, fuel economy, and retail liquids typically use US gallons.
About Cup (US)
The US customary cup is 236.588 ml (half a US liquid pint). US baking recipes frequently measure dry and liquid ingredients in cups.
How to convert gallons (us) to cups (us)
1 gallon (us) is equal to 15.99999998309299 cup (us):
1 gal = (3.78541178 L ÷ 0.2365882365 L) cup = 15.99999998309299 cup
Each gallon (us) is defined as 3.78541178 L and each cup (us) as 0.2365882365 L, so one gal equals 3.78541178 ÷ 0.2365882365 cup = 15.99999998309299 cup.
Let V(gal) be the numeric value of the same volume measured in Gallon (US) (gal), and V(cup) the value in Cup (US) (cup). Then:
V(cup) = V(gal) × (3.78541178 / 0.2365882365)
Equivalently, divide by how many gal fit into one cup (liters per cup divided by liters per gal):
V(cup) = V(gal) ÷ 0.06250000006604
Or: cup (us) = gallon (us) ÷ 0.06250000006604
Examples
Example #1: Convert 20 gal to cup (us)
20 gal = 20 gal × (3.78541178/0.2365882365) cup = 319.999999662 cup
20 gal = 20 gal ÷ 0.06250000006604 = 319.999999662 cup
Example #2: Convert 50 gal to cup (us)
50 gal = 50 gal × (3.78541178/0.2365882365) cup = 799.999999155 cup
50 gal = 50 gal ÷ 0.06250000006604 = 799.999999155 cup
Summary
To convert Gallon (US) to Cup (US), multiply the value in gal by the ratio of liters per gal divided by liters per cup. Equivalently: value_cup = value_gal × (3.78541178 / 0.2365882365). Numerically, 1 gal equals 15.999999983092989 cup.
Relationship context
Both units are US customary fluid / volume in this tool’s grouping. Conversions use fixed liter equivalents, so factors are consistent for cooking, engineering, and cross-checking labels. The factor from Gallon (US) to Cup (US) is 1.600000e+1 (1 gal = 15.999999983092989 cup).
Conversion tables
| Gallon (US) (gal) | Cup (US) (cup) |
|---|---|
| 0.1 | 1.5999999983 |
| 1 | 15.9999999831 |
| 2 | 31.9999999662 |
| 3 | 47.9999999493 |
| 4 | 63.9999999324 |
| 5 | 79.9999999155 |
| 6 | 95.9999998986 |
| 7 | 111.999999882 |
| 8 | 127.999999865 |
| 9 | 143.999999848 |
| Gallon (US) (gal) | Cup (US) (cup) |
|---|---|
| 10 | 159.999999831 |
| 20 | 319.999999662 |
| 30 | 479.999999493 |
| 40 | 639.999999324 |
| 50 | 799.999999155 |
| 60 | 959.999998986 |
| 70 | 1,119.99999882 |
| 80 | 1,279.99999865 |
| 90 | 1,439.99999848 |
| 100 | 1,599.99999831 |