ConvBolt — Unit ConverterUS cups to US gallons Converter
Converting US cups to US gallons is a multiplication by a fixed factor: 1 cup = 0.0625 gal. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one us cup works out to 0.0625 gal, the us gallon is the much smaller unit of the two: a figure given in us gallon always carries a smaller number than the same measurement in us cup. A chart drawn in cup can hide that, so check which label the axis uses before you compare two readings.
When a container size is certified in US gallons but you are dosing in US cups, it pays to convert from the certified figure rather than from a rounded label.
The conversion factor used here is 0.0625 gal per us cup (4 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 cup a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 16 cup per gal, the exact reciprocal, so a round trip through both pages returns your original number.
US cups to US gallons formula
Use this formula to convert any us cup value to US gallons:
Worked example: 100 cup × 0.0625 = 6.25 gal.
US cups to US gallons conversion table
| US cups (cup) | US gallons (gal) |
|---|---|
| 0.5 cup | 0.03125 gal |
| 1 cup | 0.0625 gal |
| 2 cup | 0.125 gal |
| 5 cup | 0.3125 gal |
| 10 cup | 0.625 gal |
| 20 cup | 1.25 gal |
| 50 cup | 3.125 gal |
| 100 cup | 6.25 gal |
| 500 cup | 31.25 gal |
| 1000 cup | 62.5 gal |
How to convert US cups to US gallons
Multiply the us cup value by 0.0625 to get the equivalent in US gallons. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the US gallons to US cups converter instead of dividing by hand; both pages use the same source factors. For every other cup conversion in one place, see the cup conversion hub.
Frequently asked questions
How many US gallons are in 1 us cup?
1 us cup = 0.0625 gal.
What is 100 US cups in US gallons?
100 cup = 6.25 gal.
Is converting US cups to US gallons the same as US gallons to US cups?
No — the direction changes the multiplier. The reverse conversion (1 gal = 16 cup) is on the US gallons to US cups page.
Related conversions
Try the ConvBolt Unit Converter for any other volume unit, browse the Volume conversions, or read our conversion guides.