mm to inches

Recent conversions

What is an inch?

The inch is a widely used unit of length in the imperial system of measurement. The symbol for the inch is the double prime (") or the abbreviation "in". It is equal to 1/12 of a foot or 2.54 centimeters in the metric system. As a visual reference, the average adult thumb is about one inch long.

The term "inch" is believed to have originated from the ancient Roman unit called "uncia," which means one-twelfth. This term was used to represent one-twelfth of a foot. Over time, this unit of measurement evolved into what is known today as the inch.

In the United States, the inch is the primary unit of length in the Customary System of Measurement, also known as the American Customary Unit or Imperial Unit. It is commonly used to measure small distances, such as the length of objects or the height of people. The inch has applications in various industries, including architecture, engineering, construction, and manufacturing. In addition, inches are the preferred unit of measurement for items such as clothing, appliances, and household goods.


Welcome to! Here, you'll find handy calculators and tools for unit conversions and calculations related to inches. Whether you're a student, a professional, or simply curious about the imperial measurement system, we've got you covered. Our aim is to provide accurate and user-friendly resources that solve everyday problems. So, if you need to convert centimeters, millimeters, meters, feet, fractional inches to inches, or vice versa, look no further. is here to assist you every step of the way.