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One US gallon is exactly equal to 3.78541 liters. This conversion differs from the imperial gallon (4.546 L) used in the UK. Our tool, updated for 2025, aligns with the exact definitions published by the US National Institute of Standards and Technology (NIST). For everyday use, standard conversion factors are sufficient. However, in scientific or industrial settings that demand maximum precision, it is vital to consider that the volume of a liquid can vary. Factors such as temperature (which causes thermal expansion) and pressure affect the density of a liquid. For this reason, in a laboratory, high-precision conversions are performed under controlled conditions. Our calculator uses globally accepted standard conversion values.
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Convert Gallons to Liters
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