Convert Volume

A US gallon equals 3.785 liters, while an Imperial (UK) gallon equals 4.546 liters. The Imperial gallon is about 20% larger. This difference stems from different historical definitions and affects all related units like quarts, pints, and fluid ounces.

A US cup equals 236.588 mL, while UK recipes may use different cup sizes (usually 250 mL metric cups). There's no standard UK cup - British recipes typically use weight (grams) or imperial fluid ounces instead of cups.

For best results, use a kitchen scale for dry ingredients and measuring cups for liquids. When converting recipes: 1 US cup = 237 mL, 1 US tablespoon = 14.8 mL, 1 US teaspoon = 4.9 mL. Always specify which measurement system when sharing recipes.

Fluid ounces measure volume, while weight ounces measure mass. 1 US fluid ounce = 29.57 mL of volume, but the weight depends on density. For water, 1 fluid ounce weighs about 1.043 weight ounces, but this varies for other liquids.

Milliliters provide precise, standardized measurements essential for chemical reactions. Unlike cups, which vary by country, milliliters are part of the International System of Units (SI) and ensure reproducible results in scientific work worldwide.

Fill the container with water, then pour into a measuring cup or graduated cylinder. For large containers, use the displacement method: submerge in a larger container and measure the overflow. This gives you the exact internal volume.

1 cubic centimeter (cm³) = 1 milliliter (mL). For larger volumes: 1 cubic meter = 1000 liters. This relationship makes it easy to convert between spatial measurements and liquid volumes in the metric system.