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Finance Calc Kit
Investments

Profitability Index Calculator

Calculate profitability index (PI) to evaluate investment projects. Solve for PI, present value of cash flows, or initial investment with instant results.

Capital budgeting inputs

$
$

Profitability index

1.3000

Ratio of discounted inflows to initial outlay

Net present value (NPV)

$60,000.00

PV of cash flows minus initial investment

Project recommendation

Accept

Accept: PI exceeds 1 and NPV is positive.

Present value of cash flows

$260,000.00

Initial capital investment

$200,000.00

How profitability index is calculated

Step-by-step breakdown from cash flow present value and initial investment.

  1. Identify present value of cash flows and initial investment

    Present value of future cash flows is $260,000.00 with an initial capital investment of $200,000.00.

  2. Calculate profitability index

    PI=PV of Cash FlowsInitial Investment\text{PI} = \frac{\text{PV of Cash Flows}}{\text{Initial Investment}}

    $260,000.00 / $200,000.00 = 1.3000

  3. Calculate net present value

    NPV=PV of Cash Flows−Initial Investment\text{NPV} = \text{PV of Cash Flows} - \text{Initial Investment}

    $260,000.00 - $200,000.00 = $60,000.00

  4. Interpret the decision rule

    Accept: PI exceeds 1 and NPV is positive.

Report tool

What is profitability index?

Profitability index (PI), also called the benefit-cost ratio, compares the present value of future cash inflows to the initial capital investment. It is a capital budgeting tool used alongside net present value (NPV) and internal rate of return (IRR) to rank projects when capital is limited.

A PI above 1.0 means discounted inflows exceed the upfront cost, so the project adds value. For example, $260,000 in present value cash flows against a $200,000 investment gives PI = 1.3 and NPV = $60,000. Compare hurdle rates with the IRR calculator, measure absolute value creation with the net present value calculator, estimate recovery timing with the payback period calculator, and set the discount rate with the WACC calculator.

Profitability index formula

PI divides the present value of all future cash flows (PVCF) by the initial capital investment (ICI). When cash flows are already discounted to today's dollars, the formula is:

PI=PV of Cash FlowsInitial Investment\text{PI} = \frac{\text{PV of Cash Flows}}{\text{Initial Investment}}

Net present value is the dollar surplus or shortfall after recovering the initial outlay:

NPV=PV of Cash Flows−Initial Investment\text{NPV} = \text{PV of Cash Flows} - \text{Initial Investment}

Decision rules and project ranking

  • PI > 1: Accept the project. Discounted inflows exceed the investment.
  • PI = 1: Indifferent. NPV is zero at the chosen discount rate.
  • PI < 1: Reject the project. The investment exceeds the value of discounted inflows.

When capital is constrained, rank mutually exclusive projects by PI to maximize value per dollar invested. PI and NPV usually agree on accept/reject decisions but PI is easier to compare across projects of different sizes.

Worked example

Suppose a manufacturing upgrade requires $200,000 upfront and is expected to generate cash flows with a present value of $260,000:

PI=260,000200,000=1.3\text{PI} = \frac{260{,}000}{200{,}000} = 1.3

NPV = $260,000 - $200,000 = $60,000. Because PI exceeds 1.0, the project creates $0.30 of present value for every $1 invested and should be accepted if no better alternative exists.

Solve modes in this calculator

Use the solve-for toggle to find any one unknown when the other two values are known:

  • Profitability index: Enter PV of cash flows and initial investment.
  • PV of cash flows: Enter PI and initial investment (PVCF = PI × ICI).
  • Initial investment: Enter PI and PV of cash flows (ICI = PVCF / PI).

Frequently asked questions

What is a good profitability index?
A PI above 1.0 indicates the project creates value at your discount rate. Higher PI means more present value per dollar invested. There is no universal threshold beyond 1.0; compare PI across competing projects when capital is limited.
How is PI different from NPV?
NPV measures absolute dollar value added. PI is a ratio that shows efficiency of capital use. Both use the same discounted cash flows and generally agree on accept or reject decisions.
Should cash flows be discounted before calculating PI?
Yes. PI uses the present value of future cash flows, not nominal undiscounted totals. Discount each expected inflow at your required rate of return before summing them.
Can PI be used for mutually exclusive projects?
Yes. When only one project can be chosen, rank by PI to maximize value per dollar invested. Also check NPV because the highest PI project may not always have the largest absolute NPV.
Are results stored on the server?
No. All calculations run in your browser. Inputs sync to the URL so you can bookmark or share a scenario.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.