On the "Future Value" tab you can calculate a matrix of future values for a given deposit / investment amount while varying the term and interest rate at which the investment is made.
The "Deposit Amount" tab allows you to calculate a matrix of investment amounts (deposits) required to reach a given future value for different terms and interest rates.
The "step amounts" on either tab control how much the interest rate and term are going to increase.
Note: It is not necessary to clear one calculation before doing the next. You can change one value and recalculate.