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The Net Present Value (NPV) Calculator:
The calculation of net present value is useful when preparing a capital budgeting project. With this calculator, you can determine whether the total present value of a project's expected future cash flows is enough to satisfy the initial cost.

In the calculator fields below enter your required discount rate, also known as the cost of capital or required rate of return. This is the return you require for the project to be an attractive investment. Secondly, enter the length of the project (in years) and the amount required to initiate the project. Finally, enter any projected net cash flows to be received throughout the life of the project. (If you project any cash outflows to be greater than inflows, enter a negative number for that net cash flow.)

If you are using the calculator to compare projects, enter in each project's cash flows separately.