Calculated Industries make a range of calculators designed for specific industries and trades, offered as both phone apps and as physical calculators. The physi

Calculated Industries make a range of calculators designed for specific industries and trades, offered as both phone apps and as physical calculators. The physical option is generally superior IMO - they're rugged, the battery lasts forever and hardware buttons are just faster, particularly if you've got wet, dirty or gloved hands. A pocket calculator is not a substitute for Excel or CAD/CAM, but it's often a more appropriate tool if you just need to make a couple of quick calculations. https://www.calculated.com/ https://www.calculated.com/