Volume Converter & Liquid Capacity Calculator

One standard US liquid gallon equals exactly 3.785411784 Liters. Under international treaty definitions ratified in 1959, 1 inch equals exactly 25.4 mm. Because a US gallon is legally fixed at 231 cubic inches, its cubic meter volume is (231 × 0.0254³) m³ = 0.003785411784 m³, yielding the exact litrage without rounding error.

In domestic US recipes, a customary cup is 1/16th of a US gallon, which equals 8 US fluid ounces or approximately 236.588 mL. However, for packaged food nutrition facts, the US Food and Drug Administration (FDA) legally defines 1 cup as exactly 240.000 mL for simplified label arithmetic. Meanwhile, the Commonwealth "Metric Cup" (Australia, New Zealand, Canada) is precisely 250.000 mL.

JavaScript uses IEEE 754 double-precision 64-bit binary floating-point numbers, which inherently cause rounding anomalies when storing base-10 fractions (such as 0.1 + 0.2 = 0.30000000000000004). SolveIt Calculator's computational engine applies integer-scaled pivot transformations and guard-digit epsilon trimming (10⁻¹²) before presenting rounded results to the user.

A US Liquid Gallon equals 231.0 cubic inches (3.785 L), whereas a US Dry Gallon (used historically for grains, bushels, and produce) equals 1/8th of a Winchester bushel, or 268.8025 cubic inches (4.40488 L). A US dry gallon is roughly 16% larger than a liquid gallon.

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