The inch (in) is an imperial unit of length equal to exactly 25.4 millimeters, widely used in the United States, Canada, and the United Kingdom. It is the standard measurement for screen sizes, pipe diameters, and mechanical fasteners, and remains common in everyday use across North America. One inch equals exactly 2.54 centimeters.

The yard (yd) is an imperial unit equal to 3 feet or 0.9144 meters, commonly used in the United States for measuring fabric, football fields, and medium-length distances. It provides a convenient middle ground between feet and miles for outdoor measurements. One yard equals exactly 0.9144 meters, which is close enough to a meter for quick estimates.