💡 How-To
How Many Ounces in a Gallon (And Other Common Conversions)
Walter Hennery·July 28, 2026·5 min read
The most common measurement conversions for cooking, baking, and everyday life. Bookmark this page " — you'll need it constantly.
Liquid Conversions
| Conversion | Equivalent |
|---|
| 1 gallon | 128 fluid ounces |
| 1 gallon | 4 quarts |
| 1 gallon | 16 cups |
| 1 quart | 32 fluid ounces |
| 1 quart | 4 cups |
| 1 cup | 8 fluid ounces |
| 1 cup | 16 tablespoons |
| 1 tablespoon | 3 teaspoons |
| 1 tablespoon | 0.5 fluid ounce |
Weight Conversions
| Conversion | Equivalent |
|---|
| 1 pound | 16 ounces |
| 1 pound | 453.6 grams |
| 1 kilogram | 2.2 pounds |
| 1 ounce | 28.35 grams |
Cooking Temperature
| Fahrenheit | Celsius | Gas Mark | Description |
|---|
| 325°F | 165°C | 3 | Slow |
| 350°F | 175°C | 4 | Moderate |
| 375°F | 190°C | 5 | Moderate |
| 400°F | 200°C | 6 | Moderately hot |
| 425°F | 220°C | 7 | Hot |
| 450°F | 230°C | 8 | Very hot |
Quick Mental Math
- Cups to ounces: Multiply by 8
- Tablespoons to cups: Divide by 16
- Pounds to ounces: Multiply by 16
- Fahrenheit to Celsius: Subtract 32, multiply by 5, divide by 9
- Celsius to Fahrenheit: Multiply by 9, divide by 5, add 32
The gallon visualization: A gallon of milk is 128 ounces. A standard water bottle is 16.9 ounces. So a gallon equals about 7.5 water bottles. This helps visualize how much water you're drinking daily.
⚠️ Common mistakes:
- Don't confuse fluid ounces (volume) with ounces (weight) " — they're different measurements
- Don't use liquid measuring cups for dry ingredients " — they're not accurate
- Always measure dry ingredients by weight (grams) for baking accuracy
The bottom line: The most important conversion: 1 gallon = 128 ounces = 16 cups = 4 quarts. For cooking: 1 cup = 8 oz = 16 tablespoons. For weight: 1 pound = 16 ounces = 454 grams. Bookmark this page for quick reference.