500 mL = 0.5 L = 0.1320860884 gal = 2.083333333 cup = 16.90702825 fl oz
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1 mL = 0.001 L
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Liquid and dry “cup” measures trip people up because US and metric labels don’t mean the same thing at every border. This page keeps the math in one place so you can scale recipes or compare container sizes without a notebook.
The liter is tied to the meter cubed in SI, while US customary volume measures (gallon, cup) grew from older wine and grain gallons—hence the stubborn gap between “a gallon” and four liters.
V_target = V_source × (m³ per source unit) / (m³ per target unit)
Each volume unit is defined as a cube of a linear measure or an agreed liquid volume. Because everything ultimately references the cubic meter, you only need consistent ratios—no offsets.
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These are independent references—government labs, international measurement bodies, or university course materials—that explain the definitions behind the numbers. We don’t endorse third-party sites; we point to them for deeper reading.
Short version: To convert US Gallons to Liters, multiply by 3.785.
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No, a UK (Imperial) gallon is about 20% larger than a US gallon.
There are 4 US cups in 1 US quart.
Volume tools vary by meniscus reading, temperature, and “cup” definition. For repeatability in baking, weigh ingredients when the author gives grams.
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