The term width denotes the side-to-side measurement of an object — the distance across it at right angles to its height. In everyday language it is often used interchangeably with breadth, though technical contexts may favor one word over the other. Width is one of the basic linear dimensions used to describe size and shape.
Definition and distinctions
Width is typically measured perpendicular to height and, in three-dimensional descriptions, is distinct from length or depth. For flat or planar objects the pair of dimensions commonly used are length and width; for three-dimensional items the three axes are usually called length, width, and height (or depth). The same physical span might be called width in one context and depth in another depending on orientation and convention.
Measurement and units
Width is expressed as a linear measure in units such as millimeters, centimeters, meters, inches, or feet. Common tools for measuring width include:
- Tape measure — for larger objects and construction work.
- Caliper — for small parts with higher precision.
- Ruler or yardstick — for everyday tasks.
Applications and examples
Width is important across many fields: in furniture design the width of a chair seat affects comfort; in clothing it determines fit; in manufacturing it controls tolerances; in graphic and web design the CSS "width" property sets element size. For example, the distance from the left edge to the right edge of a chair seat is its width, as in an left-to-right distance of a chair.
Understanding width helps with spatial planning, quality control, and communication of dimensions. Because conventions vary by discipline, it is good practice to state which axis each term refers to when reporting measurements.