Hi Wildgoose, there is already an RPN calculator in Ovi Store
http://store.ovi.com/content/205187?...e=search&pos=2

jnwi, I'm glad your scientific calculator is under development. It looks good. But maybe a square root button for those who are clueless that it is the same as ^0.5? You can also save some keys by putting related functions on one key (like sin, asin) and using a 'shift' button. Btw, what is the purpose of the <- button?