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The imperial system, also known as the British imperial system, is a system of weights and measures that was established in the British Empire. It is largely based on the English customary units, which have their roots in Roman units. While it was once the standard for many countries, it has largely been replaced by the metric system.

The imperial system includes units for length, mass, and volume. For length, common units include the inch, foot, yard, and mile. Mass is measured in ounces, pounds, and tons. Volume is measured in fluid ounces, pints, quarts, and gallons. The definitions of these units have evolved over time, with the modern definitions being established in the 19th century.

The United States customary units share many similarities with the imperial system but have some key differences, particularly in volume measurements like the gallon. For example, an imperial gallon is larger than a US gallon.

The use of the imperial system is now mainly confined to a few countries, most notably the United States, and is still used in some niche applications in the United Kingdom and other Commonwealth countries. However, for most scientific, industrial, and international trade purposes, the metric system (International System of Units, SI) is the global standard.