Inch

Definition: An inch (symbol: in) is a unit of length in the imperial and US customary systems of measurement. An inch was defined to be equivalent to exactly 25.4 millimeters in 1959. There are 12 inches in a foot and 36 inches in a yard.
Current use: The inch is mostly used in the United States, Canada, and the United Kingdom. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens.
Foot

Definition: A foot (symbol: ft) is a unit of length in the imperial and US customary systems of measurement. A foot was defined as exactly 0.3048 meters in 1959. One foot contains 12 inches, and one yard is comprised of three feet.
Current use: The foot is primarily used in the United States, Canada, and the United Kingdom for many everyday applications. In the US, feet and inches are commonly used to measure height, shorter distances, field length (sometimes in the form of yards), etc. Feet are also commonly used to measure altitude (aviation) as well as elevation (such as that of a mountain). The international foot corresponds to human feet with shoe size 13 (UK), 14 (US male), 15.5 (US female), or 46 (EU).

Converting inches to feet (In to Ft) is quick and easy once you know how to do it! The basics to remember are that there are 12 inches in one foot, so you can get from inches to feet by dividing by 12. You can get back to inches by multiplying the number of feet by twelve.
For an example difficulty :
How can I convert 45 inches into feet?
i can do  45 / 12 = 3 feet and 9 inches, or 3 3/4 feet.  If conversion makes you feel complicated
,let's use https://www.calculatorful.com/inches-to-feet to keep things simple