Pattern-Making Calculator is a program designed to allow you to make simple calculations such as additions, subtractions, divisions or percentage; to more complex operations such as to convert decimals into fractions or from cm to inches and vice-versa. If you want to make a simple operation, e.g., an addition, you type the first number, then click the + button, then enter the new number and press =. So far, this can be done by any calculator, but when it comes to more complicated operations, this calculator comes handy, e.g., for those using the Imperial measurement system, since it is easier to represent a fraction than a decimal, e.g., you want to represent a decimal fraction 8.5 in a simple fraction, all you have to do is enter the decimal fraction and then the calculator will show you the simple fraction, 8½. Moreover you can convert from cm. to inches in a simple and fast way. Apart from this, the Radius of a circumference can be calculated. Either you want to calculate the full, 3/4, half, or quarter of a circle, all you have to do is type in the full length of the perimeter and click on the buttons which are located on the right of the calculator and which are represented by a full circle, 3/4 of a circle, half a circle, or quarter of a circle. This tool is very helpful for many people who make patterns using the Imperial measurement system.