When you search the net for costumes, you'll sometimes see armors and weapons which are not proportional correct. It can be the sword being too small, the helm being too high, or a specific armor part which is too small or too big compared to the rest of the armor. This program is designed to scale the size of costumes and props in relation to your own height, so you avoid the prementioned errors. To use the calculator, you import an image of the character you wish to cosplay into the calculator. You then write your height in the Height text box, and use the ruler tool to mark the highest and lowest point of the character. The calculator will then find the character's height in pixel and scale it to your height. Now you can use the ruler tool to mark any length in the image, and the calculator will then find the length in relation to your heigth.