Help your clients envision the future using calculations for future value, present value, payment, interest rate and time where all the inputs show rather than be hidden like a typical calculator.   It only works when inputs are level and unchanging and you know 4 of the 5 variables.

Small enough to be used in conjunction with other software on the screen, this calculator illustrates statistics and return on investment projections simply and effectively. 

For example:
If I had $50,000 and was adding $1000 per year, what interest rate would I need to earn to get $1,000,000 in 20 years? 
Answer:15.39%