Combination investment/cash flow calculator

[TexasLongball]

Evidently I'm not searching for the correct terms but I can't locate a calculator that I need. I'm well-versed in investment/retirement calculators but I want something that I can manually input different contributions through the years and manipulate the outcomes. I'm not talking about setting a 5% increase in contribution amounts. I want something that I can input any dollar amount I want at a future date.
Does anyone know of an online calculator that can capture this information?

Thanks!

[STGS]

Look up time value of money calculator. Other key words will be irregular cash flow, future value, present value, rate of return. Google should point you in the right direction.

[Shane]

I don't know of one, but you can create a spreadsheet in Excel to do it.

[TexasLongball]

Look up time value of money calculator. Other key words will be irregular cash flow, future value, present value, rate of return. Google should point you in the right direction.

That's what I was looking for!

I don't know of one, but you can create a spreadsheet in Excel to do it.

Doing it in Excel now. Gracias!