📈 Net Present Value (NPV) Calculator

By ToolNimba Finance Team · Reviewed by ToolNimba Editorial Review, corporate finance content · Updated 2026-06-19

This calculator is an estimate for education and planning only. The result depends entirely on the discount rate and cash-flow forecasts you enter, both of which are uncertain. It assumes inflows arrive at the end of each year and excludes tax, inflation adjustments and financing detail. It is not investment advice, confirm the figures and speak to a qualified financial or investment adviser before committing capital.

Discount rate (% per year)

Initial investment (outflow at year 0)

Yearly cash flows (inflows)

Year 1

Cash flow

Net Present Value

PV of cash flows

Verdict

Enter the discount rate, the initial investment, and one cash flow per year. NPV discounts every future inflow back to today and subtracts what you paid up front.

Net Present Value (NPV) tells you whether a project or investment is worth more than it costs, in today’s money. Because a dollar received in five years is worth less than a dollar today, NPV discounts every future cash flow back to the present and subtracts the up-front investment. Enter your discount rate, the initial outlay and the cash you expect each year, and this calculator returns the NPV, the present value of the inflows, and a plain verdict on whether the numbers stack up.

What is the NPV Calculator?

Net Present Value is the cornerstone of discounted cash flow (DCF) analysis. The idea rests on the time value of money: cash you receive later is worth less than the same amount today, because today’s cash could be invested to earn a return. To compare a stream of future cash flows fairly with money spent now, you discount each future amount back to its present value using a discount rate, then add them up and subtract what you paid up front. If the total is positive, the investment is expected to earn more than your required return.

The discount rate is the most important and most subjective input. It represents your required rate of return or opportunity cost of capital, often a company’s weighted average cost of capital (WACC) or a rate that reflects the riskiness of the cash flows. A higher discount rate shrinks the present value of distant cash flows more aggressively, so it pushes NPV down. Small changes in the rate can flip a project from positive to negative NPV, which is why analysts test a range of rates rather than trusting a single figure.

The NPV decision rule is simple: accept projects with a positive NPV and reject those with a negative NPV, because a positive NPV means the project adds value beyond your hurdle rate. NPV is closely related to the internal rate of return (IRR), which is the discount rate at which NPV equals zero. When comparing mutually exclusive projects, NPV is generally preferred to IRR because it measures the actual dollar value created rather than a percentage, and it does not suffer from the multiple-rate problems that can affect IRR with unusual cash-flow patterns.

When to use it

Deciding whether a capital project, such as new equipment or a product line, is worth funding.
Comparing two investments with different cash-flow timings on an equal, present-value basis.
Valuing a rental property, business or asset by discounting its expected future cash flows.
Stress-testing a decision by raising the discount rate to see how sensitive the NPV is to your required return.

How to use the NPV Calculator

Enter the discount rate (your required return or cost of capital) as a percent per year.
Enter the initial investment, the cash you pay out today at year 0.
Add one cash flow per year for each year the project produces money.
Read off the NPV, the present value of the inflows, and the accept or reject verdict.

Formula & method

NPV = − Initial Investment + Σ ( CFₜ ÷ (1 + r)ᵗ ) for t = 1 to n, where CFₜ is the cash flow in year t, r is the discount rate as a decimal, and n is the number of years.

Worked examples

You invest $10,000 today and expect $4,000, $5,000 and $6,000 over the next three years. Your discount rate is 10%.

Year 1 PV = 4,000 ÷ 1.10¹ = 4,000 ÷ 1.10 = 3,636.36
Year 2 PV = 5,000 ÷ 1.10² = 5,000 ÷ 1.21 = 4,132.23
Year 3 PV = 6,000 ÷ 1.10³ = 6,000 ÷ 1.331 = 4,507.89
Present value of inflows = 3,636.36 + 4,132.23 + 4,507.89 = 12,276.48
NPV = 12,276.48 − 10,000 = 2,276.48

Result: NPV ≈ $2,276.48 (positive, so accept the project)

You invest $5,000 today and expect $2,000 a year for three years. Your discount rate is 8%.

Year 1 PV = 2,000 ÷ 1.08¹ = 1,851.85
Year 2 PV = 2,000 ÷ 1.08² = 2,000 ÷ 1.1664 = 1,714.68
Year 3 PV = 2,000 ÷ 1.08³ = 2,000 ÷ 1.259712 = 1,587.66
Present value of inflows = 1,851.85 + 1,714.68 + 1,587.66 = 5,154.19
NPV = 5,154.19 − 5,000 = 154.19

Result: NPV ≈ $154.19 (just positive, the project barely clears the 8% hurdle)

Present value of $1 received in year n (the discount factor 1 ÷ (1 + r)ⁿ)

Year	At 5%	At 8%	At 10%	At 15%
1	0.9524	0.9259	0.9091	0.8696
2	0.9070	0.8573	0.8264	0.7561
3	0.8638	0.7938	0.7513	0.6575
5	0.7835	0.6806	0.6209	0.4972
10	0.6139	0.4632	0.3855	0.2472

Common mistakes to avoid

Using a discount rate that does not reflect the risk. The discount rate should match your required return or cost of capital for cash flows of this risk. Using a rate that is too low flatters a risky project and can turn a bad investment into a deceptively positive NPV.
Forgetting that the initial investment is an outflow. The money you spend today sits at year 0 and is subtracted, not discounted. A common slip is adding it to the inflows or discounting it, which overstates the NPV.
Confusing nominal and real cash flows. If your cash flows include inflation (nominal), discount with a nominal rate. If they are in today’s prices (real), use a real rate. Mixing the two double-counts or ignores inflation and distorts the result.
Ignoring the timing assumption. This tool assumes each cash flow arrives at the end of its year. If money actually comes in monthly or at the start of the year, the true present value is slightly higher, so treat year-end NPV as a conservative figure.

Glossary

Net Present Value (NPV): The present value of all future cash inflows minus the initial investment, expressed in today’s money.
Discount rate: The annual rate used to convert future cash to present value, reflecting your required return or cost of capital.
Discounted cash flow (DCF): A valuation method that discounts expected future cash flows back to the present to estimate value.
Present value (PV): What a future amount of money is worth today once it has been discounted at the chosen rate.
Internal rate of return (IRR): The discount rate at which the NPV of a project equals zero, often compared with the required return.
Time value of money: The principle that a sum of money is worth more now than the same sum in the future, because it can be invested.

Frequently asked questions

What is net present value?

Net present value (NPV) is the difference between the present value of an investment’s future cash inflows and the amount you invest up front. It discounts each future cash flow back to today using a chosen discount rate, then subtracts the initial outlay. A positive NPV means the investment is expected to earn more than your required return.

How is NPV calculated?

NPV = −initial investment + the sum of each year’s cash flow divided by (1 + r) raised to the power of the year, where r is the discount rate as a decimal. The calculator discounts every yearly inflow, adds them up to get the present value, and subtracts what you paid at the start.

What does a positive or negative NPV mean?

A positive NPV means the discounted inflows exceed the cost, so the project is expected to create value above your required return and should be accepted. A negative NPV means it falls short and would destroy value. An NPV of exactly zero means the project earns precisely your discount rate.

What discount rate should I use?

Use a rate that reflects your required return or cost of capital for cash flows of this risk. Businesses often use their weighted average cost of capital (WACC); individuals might use the return available on an alternative investment of similar risk. Higher risk justifies a higher rate, which lowers NPV.

What is the difference between NPV and IRR?

NPV gives the value created in dollars at a fixed discount rate, while the internal rate of return (IRR) is the discount rate that makes NPV zero, expressed as a percentage. NPV is usually preferred for ranking projects because it measures actual value added and avoids the multiple-answer problems IRR can have.

Does this calculator account for inflation and tax?

No. It discounts the cash flows exactly as you enter them and does not adjust for tax or inflation. If you want a real (inflation-adjusted) NPV, enter cash flows in today’s prices and use a real discount rate, and enter after-tax cash flows if you need an after-tax result.

Sources

Net Present Value (NPV) , Investopedia
Time Value of Money and Net Present Value , U.S. Securities and Exchange Commission (Investor.gov)