This app is a simple and light calculator. It has the following features. · Change background image · Frosted glass effect · Percentage calculation · 00 input · Up to 12 digits calculation · Backspace [Change background image] You can change the background with your favorite photo. [Frosted glass effect] If numbers or symbols are difficult to see, please enable the frosted glass effect. It will be seen like the passcode input screen of iPhone unlock. [Percentage calculation] This app supports to a convenient percentage calculation for calculating the discount price or the tax inclusive price of the consumption tax. It can be calculated by the following calculation formula. · Tax included (ex: 8%) 1980 + 8 % = · Discount (ex: 30% off) 1980 - 30 % = [00 input] This app has a convenient 00 key for continuous input of 0. [Up to 12 digits calculation] This app supports calculations with enough digits for the calculation of everyday life. You can calculate up to 12 digits for integers and up to 10 digits for decimal places. [Backspace] You can delete the last digit. Because backspace is also valid in calculation results, it is convenient to recalculate after deleting fractions.