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In contrast with the built-in iOS calculator? RPN and unit conversions, primarily, but also occasionally other functions like exponentiation, etc.

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My question was more 'what are you doing that need complex calculations?'

I don't know what RPN is btw.

"Reverse Polish Notation"[0], commonly used on Hewlett-Packard calculators, and considered a superior means of entering calculations on a calculator versus the way most calculators work. Considered by many to be reason enough to switch calculators.

[0] https://en.wikipedia.org/wiki/Reverse_Polish_notation

Thanks.

The built in iOS calculator does have exponentiation (in landscape mode), FYI.

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