Net Present Value (NPV) Calculator – Investment Appraisal

The Net Present Value (NPV) is one of the most important metrics in investment appraisal. It indicates whether an investment is worthwhile when considering the discount rate. A positive NPV means the investment is advantageous; a negative value speaks against the investment. Use our free calculators to compute the NPV for standard investments or investments with variable cash flows.

How the NPV Calculator Works

The net present value is calculated as the sum of all discounted future payments (present value) minus the initial investment. Each future payment is discounted to today using the discount rate. The formula is: NPV = -I₀ + Σ (Ct / (1+r)^t), where I₀ is the initial investment, Ct is the cash flow in period t, r is the discount rate, and t is the period. For a standard investment, annual cash flows are uniform, while variable cash flows allow different amounts for each period.

Normal Investment

Normal Investment

Variable Cash Flow

Variable Cash Flow

Use this calculator to determine the Net Present Value (NPV) of an investment based on a series of cash flows over time.

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Cash Flows

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Frequently Asked Questions

What is Net Present Value (NPV)?
Net Present Value is the sum of all discounted future cash flows of an investment minus the initial investment. A positive NPV means the investment earns a return above the discount rate.
How do you calculate NPV?
NPV is calculated by discounting all future cash flows to the present using the discount rate. The formula is: NPV = -I₀ + Σ (Ct / (1+r)^t). Our calculators handle this computation automatically for you.
What is a good NPV?
An NPV greater than 0 (zero) is considered good. It means the investment yields a higher return than the discount rate. The higher the positive NPV, the more advantageous the investment.
What is the difference between a standard investment and variable cash flow?
In a standard investment, annual inflows and outflows are constant over the entire duration. With variable cash flows, payments can vary in each period, allowing for more flexible investment models.
What discount rate should I use?
The discount rate typically corresponds to the company's cost of capital or the expected minimum return. Often the long-term loan interest rate or the weighted average cost of capital (WACC) is used.