I would have to agree with the options  suggested already. Some coding could be to your benefit in that you could control the look of it (at least a bit, depending on your skill set).

Coding is something I am finding to be beneficial to elearning design and development. Sure the apps let you create some cool stuff, but there are always limitations. I have been learning some html, css and java coding myself (basics currently) and hopefully this will help me going forward. So these suggestions may be beneficial to look into.

If you know HTML you can create one and insert it as a web object. I like the personal touch.

Some possibilities:

• Find such a calculator on the web and insert it as a web object.
• You can also create a keypad or a calculator in Captivate using shared/advanced actions and/or JS in combination with user variables. You will find enough tutorials for that subject (have some on my personal blog.