Convert liquid volume
Use the right unit family
Recipes, product labels, tanks, aquariums, and pools may use different systems. This page keeps common U.S. liquid units and metric units together so the result is easy to check before you pour, buy, fill, or estimate weight.
For water weight, convert the volume first, then use the water weight calculator for pounds or kilograms.
Common liquid-volume conversions
| Conversion | Approximate result | Typical use |
|---|---|---|
| 1 U.S. gallon | 3.785 liters | Water, fuel, tanks, pools |
| 1 liter | 33.814 U.S. fluid ounces | Bottles and recipes |
| 1 U.S. cup | 236.588 milliliters | Cooking and nutrition labels |
| 1 U.S. tablespoon | 14.787 milliliters | Small kitchen measurements |
Before using the result
Kitchen estimates, aquarium setup, and home projects can tolerate rounding. Medication, laboratory mixing, industrial chemicals, and safety-critical measurements should follow verified instructions from the product, clinician, lab, or supplier.