Scalar: The Better Calculator, a calculator for both your iPad and iPhone is now on sale for free.
If you have been looking for a calculator for your iPad, this is an app to check out.
The developer describes the app as follows:
Why limit yourself to one line display of cheap pocket calculators when your iPhone or iPad can do much more? Scalar gives you an endless sheet of paper you can calculate on so you’ll never lose track again, even with the most complex calculations.
Your calculations are automatically saved when you leave the app and you can share them by e-mail.
* editable entries, the app recalculates everything as you type
* entries could be referenced from each other for very complex calculations
* arbitrary precision numbers
* e-mail integration
* copy/paste in calculations
* saves last calculation between launches
* tap and hold backspace to clear whole calculation