This is how to get your RPN fix

I gave it 5 stars but I hope James puts me in a T-shirt anyway.

RPN is missing on many of the calculators available today. pCalc does it very well. I have used pCalc on the Mac and now iOS for quite some time. The interface has stayed intuitive throughout. Nicely done.

kcmichaelm about PCalc, v3.5.3