Numeric is a multi-touch calculator for your Mac.
Instead of pointing-and-clicking with your mouse, Numeric is a calculator with keys you can touch directly. The keys on Numerics keypad are mapped to the same locations on your Macs multi-touch trackpad. So to press a key, just tap it on your trackpad.
Numeric works on any Mac with a multi-touch trackpad, which includes:
• MacBook Air (Late 2010 and later)
• MacBook (Late 2009 and later, or the Aluminum MacBook)
• MacBook Pro (Late 2008 and later)
• Any Mac with Magic Trackpad
Additional features of Numeric include:
• Delete button (top right corner)
• Undo and redo for all actions (Command-Z)
• Scientific notation
• Local number format
Yes, I know its not entirely accurate, but with practice, you should find Numeric to be slightly easier to use than the built in Calculator.