RPN Memory Calculator

December 26, 2022

Fixes font size irregularities in some iPhone mini models.

November 6, 2022

Fixes button positioning issues seen on some recent iPhones.

May 27, 2021

Support iPad split screen mode and minor corrections to layouts for 12 iPhones

November 25, 2020

Updates to button positioning to improve the look on new iPhone (12) models

March 20, 2020

Following requests from App users we have changed the purpose of the M+x and M-x buttons. These no longer operate on the memory value, those functions will need to be applied to the x register and then the memory value can be updated using M=x. Removing the M+x and M-x buttons has allowed us to add two new buttons: nth Root (x√y) - this button takes the nth root of the y register, with n being the x register. We have removed the square root button, you can do a a square root of the y register by pressing the x√y button after entering a 2 into the x register. If you prefer to carry on using a regular square root, without a enter followed by entering 2 into the x register, a long press on x√y will toggle its meaning back to square root. Another long press toggles it back, so you can choose whatever mode you prefer as an when you like. y to the power of x (y^x) - this button raises the value in the y register to the x register power. As above, this button can be toggled to a convenient square x (sq x) button with a long press. last x - this new button is a convenience button: it does an enter (shifting x register into y, y into x, and so on) and then places the previous value of x prior to the last calculation back into the x register. Finally, the locations of the π and 1/x buttons have moved.

March 3, 2020

Minor bug fixes related to displayed decimal place after deleting digits.

February 4, 2019

Minor fixes.

December 4, 2018

This free new version integrates unit conversions into the calculator. The "conv" button brings up an intuitive unit conversion screen that allows you to convert the x register value between numerous types. The converted value can either be accepted back into the x register, or discarded. You can also amend the value being converted from within the conversion screen. The unit conversion screen is limited to a fixed number of free uses, after which a small in-app purchase is required. This version also remembers your calculated numbers, including all the registers and the memory field. It also remembers your last used conversion types, so if your speed conversions are usually mph to kph, these will be preselected when you launch the conversions screen.

October 14, 2018

Updated for new iPhone models and fixes a screen sizing issue with smaller iPhones.

June 21, 2018

Calculator Unit Conversions

X register unit conversions