CalcBar is a simple Menu Bar application that provides you with accurate results for any basic algebra equation you wish to solve. This program is very easy to handle, doesn't use a large amount of CPU resources, and offers you the answers you need within moments.
CalcBar accepts various basic operation types, like addition, subtraction, multiplication, and division. I like the fact that immediately after you enter the math expression, the application provides you with the result you require.
Another good aspect about this app is that it keeps a log with all solved equations in case you need them later.
The only thing I would change about this application is adding a global hotkey option to reveal the program's main window whenever I need it. This feature that might come in handy when you're dealing with a tight schedule and need to make simple math calculation immediately.
Cutting a long story short, CalcBar is a simple yet effective program that helps you solve basic math equations with ease. The application sits quietly on your Menu Bar, keeps a log with all solved equations, and comes without a price tag.