Gallon Calculator
Convert gallons to liters, cups, quarts, and other volume units
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Volume Conversion
Common Gallon Conversions
Gallon to Metric
1 US gallon = 3.785 liters
1 UK gallon = 4.546 liters
1 US gallon = 3,785 milliliters
1 gallon = 0.00379 cubic meters
Gallon to Imperial
1 gallon = 4 quarts
1 gallon = 8 pints
1 gallon = 16 cups
1 gallon = 128 fluid ounces
Quick Reference
Common Pool Sizes
| Pool Type | Gallons |
|---|---|
| Hot Tub | 400-500 gal |
| Above Ground | 10,000-15,000 gal |
| Inground Small | 15,000-20,000 gal |
| Inground Large | 25,000-30,000 gal |
| Olympic Pool | 660,000 gal |
Common Uses
Pool & Spa
Calculate water volume and chemical dosing
Fuel Consumption
Gas mileage and fuel efficiency
Cooking & Baking
Large batch recipes and conversions
Water Usage
Home water consumption tracking
Understanding Gallons and Volume Conversion
What is a Gallon?
A gallon is a unit of volume measurement used primarily in the United States and United Kingdom. It's commonly used for measuring liquids like water, milk, gasoline, and other fluids.
Types of Gallons
- •US Gallon: 3.785 liters
Most common in the United States - •UK (Imperial) Gallon: 4.546 liters
Used in the United Kingdom and some Commonwealth countries - •US Dry Gallon: 4.405 liters
Rarely used, mainly for agricultural products
Conversion Formulas
US Gallon Conversions
1 US gallon = 3.78541 liters
1 US gallon = 4 quarts
1 US gallon = 8 pints
1 US gallon = 16 cups
1 US gallon = 128 fl oz
UK Gallon Conversions
1 UK gallon = 4.54609 liters
1 UK gallon = 1.201 US gallons
1 UK gallon = 4 UK quarts
1 UK gallon = 8 UK pints
1 UK gallon = 160 UK fl oz
💡 Practical Tips
- • Remember: UK gallons are about 20% larger than US gallons
- • For cooking: US recipes use US gallons, UK recipes use UK gallons
- • Gas stations in the US sell by US gallons, UK by liters
- • Pool chemicals are often dosed per gallon - check which type!
- • Water density changes with temperature, affecting weight calculations
🔧 Technical Applications
- • Volume = Length × Width × Average Depth × 7.48
- • Chemical dosing per 10,000 gallons
- • Pump flow rates in gallons per minute
- • Miles per gallon (MPG) calculations
- • Fuel cost per gallon analysis
- • Tank capacity conversions