Why Convert US Gallons to US Quarts?
Converting between us gallons (gal (US)) and us quarts (qt (US)) is one of the most common volume conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert gal (US) to qt (US) saves time and prevents errors.
Volume conversions between gal (US) and qt (US) are vital for cooking, travel, and automotive contexts. The TSA 3-1-1 rule limits carry-on liquids to 100 mL (3.4 fl oz) containers — a conversion every international traveler needs. In cooking, US recipes use cups and tablespoons while metric recipes use milliliters. For automotive purposes, fuel tank capacity is measured in liters in most countries but gallons in the US.
How to Convert US Gallons to US Quarts
To convert us gallons to us quarts, use the following formula:
qt (US) = gal (US) × 4
Example: 1 gal (US) = 4 qt (US)
For example, 5 gal (US) = 20 qt (US), 10 gal (US) = 40 qt (US), and 100 gal (US) = 400 qt (US). Our calculator above performs this conversion instantly with full precision — no rounding errors.
Common Use Cases
- Gallon jug of milk: 1 gal (US) = 4 qt (US)
- 5-gallon water cooler jug: 5 gal (US) = 20 qt (US)
- Motor oil change (typical small engine): 2 gal (US) = 8 qt (US)
- Half-gallon carton of ice cream: 0.5 gal (US) = 2 qt (US)
Common Mistakes to Avoid
- US vs UK gallons: A US gallon (3.785 L) is smaller than a UK gallon (4.546 L). Always specify which system you're using.
- Fluid ounces vary: US fluid ounce ≠ UK fluid ounce. This converter uses US measures unless specified as UK.
- Cup measurement inconsistency: A US cup = 236.6 mL, metric cup = 250 mL, Japanese cup = 200 mL. Always verify which standard your recipe uses.
Pro Tips
- Memorize the factor: 1 gal (US) = 4 qt (US). For quick mental math, remember this base conversion.
- Quick reference: 5 gal (US) = 20 qt (US) · 10 gal (US) = 40 qt (US) · 25 gal (US) = 100 qt (US) · 50 gal (US) = 200 qt (US) · 100 gal (US) = 400 qt (US)
- Bookmark this page: Save this converter for instant access. It works offline once loaded — no internet needed.
US Gallons to US Quarts Conversion Table
| gal (US) | qt (US) |
|---|---|
| 0.01 gal (US) | 0.04 qt (US) |
| 0.1 gal (US) | 0.4 qt (US) |
| 0.5 gal (US) | 2 qt (US) |
| 1 gal (US) | 4 qt (US) |
| 2 gal (US) | 8 qt (US) |
| 5 gal (US) | 20 qt (US) |
| 10 gal (US) | 40 qt (US) |
| 20 gal (US) | 80 qt (US) |
| 50 gal (US) | 200 qt (US) |
| 100 gal (US) | 400 qt (US) |
| 500 gal (US) | 2000 qt (US) |
| 1000 gal (US) | 4000 qt (US) |
All values in this table are mathematically exact per NIST SP 811.