NPV Calculator
Net Present Value (NPV) measures the profitability of an investment by calculating the present value of all expected cash flows discounted to today, minus the initial investment.
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Formula
NPV = Σ [CF_t / (1 + r)^t] − Initial Investment
For each year t, the cash flow (CF) is divided by (1 + discount rate)^t to find its present value. Summing all discounted cash flows and subtracting the initial investment gives the NPV. A positive NPV means the investment creates value.
How to use the NPV Calculator
- 1
Enter your initial investment
Value should be in $.
- 2
Enter your annual cash flow
Value should be in $.
- 3
Enter your discount rate
Value should be in %.
- 4
Enter your project life
Value should be in years.
- 5
Read your results instantly
Results update in real time as you type.
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Why NPV is the gold standard for investment decisions
NPV accounts for the time value of money — the fundamental financial principle that a dollar today is worth more than a dollar in the future. By discounting future cash flows, NPV tells you what those future earnings are worth in today's dollars.
Unlike simple payback period or ROI, NPV handles the timing of cash flows, making it the preferred method in corporate finance and capital budgeting.
Choosing the right discount rate
The discount rate is critical. For businesses, it's typically the Weighted Average Cost of Capital (WACC) — the blended cost of debt and equity financing. For individuals, it might be the expected return on the next best alternative investment.
A higher discount rate makes future cash flows worth less, resulting in lower NPV. If your discount rate equals your actual cost of capital, a positive NPV means the project earns more than it costs.
Tips & Insights
NPV > 0 is necessary but not sufficient
A positive NPV tells you an investment is worthwhile — but not how much better it is than alternatives. Compare NPVs across projects and consider the scale of investment required.
Be conservative with cash flow estimates
Overestimating future cash flows is the most common NPV mistake. Use conservative estimates and run a sensitivity analysis to see how NPV changes if cash flows are 20% lower than expected.
Worked Examples
Equipment purchase decision
NPV = $11,793. Positive NPV confirms the purchase creates value at an 8% cost of capital. The present value of all savings is $111,793 — $11,793 more than the cost.
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Frequently Asked Questions
What does a positive NPV mean?
A positive NPV means the investment is expected to generate more value than it costs, making it potentially worthwhile. A negative NPV suggests the investment may not be profitable at the given discount rate.
What is the relationship between NPV and IRR?
IRR (Internal Rate of Return) is the discount rate at which NPV equals zero. If the IRR exceeds your cost of capital, the investment is attractive — consistent with a positive NPV at your actual discount rate.
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