Are you looking for quick and simple tool for IRR calculations? FinXL IRR is a portable tool for calculating internal rate of return from series of cash flows (equivalent to MS Excel IRR function).
For example, a project has 4 cash flows at the end of each of next 3 years equaling $5,000 $4,000 $3,000 and $1,000 with initial cash outlay of $10,000. Then type in -10000 5000 4000 3000 1000 in the box at top and click compute button to find IRR (internal rate of return).