Calcbot

Calcbot is an intelligent calculator and unit converter. Every calculation you enter gets saved to the history tape and optionally sent to your clipboard for quick pasting.

Calcbot’s original expression view allows you to see everything you have typed, so you’ll never forget what you entered or miss a typo. It converts any of your calculations with over 500 units across 22 different categories, including auto-updating currency rates. You get instant access to scientific constants like Pi, atomic mass, or add your own.