There's also PCalc lite which is free. I bought full PCalc, but had them both on my phone for awhile until I eventually deleted the lite version. I rarely neede

There's also PCalc lite which is free. I bought full PCalc, but had them both on my phone for awhile until I eventually deleted the lite version. I rarely needed the full version, though I was happy to help support a developer doing good work by buying the full version.