How do you get a calculator on a PSP?

To get a calculator on a PSP, you can either download a calculator homebrew application or use the built-in calculator feature if available on your firmware version. For homebrew options, you can find calculator apps on various PSP community websites or forums. Simply transfer the downloaded files to the appropriate folder on your PSP using a USB connection. If your PSP firmware supports it, you can also check the system settings for a pre-installed calculator.