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Net Present Value Calculator

NPV = Σ cash flow at period t divided by (1+rate)^t.

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NPV calculator online

NPV = Σ cash flow at period t divided by (1+rate)^t. Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

How to use it

Paste JSON matching the structure in the example. Set discount rate per period (%). Choose Calculate. Review the output, then copy or download it.

Options and example settings

Option	Choices / value	Example default
Discount rate per period (%)	Enter discount rate per period (%).	10

Worked examples

Use this for the specific transformation described above. Start with the fixed sample and compare its result before replacing it with your own representative input.

Reproducible worked example

Settings: Discount rate per period (%): 10

Input:

[-1000,400,400,400]

With the input and settings above, the tool produces:

Output:

{
  "npv": -5.259203606311189,
  "periodRatePercent": 10
}

For this input, “npv” is -5.259203606311189; “periodRatePercent” is 10. These are the named fields in the example output.

Choose the right tool

The first cash-flow value is at time zero. A spreadsheet formula that discounts its first listed value at the end of period one uses a different timing convention.

Limitations and common mistakes

The first array value occurs at time zero; later flows occur at equal period-end intervals. For Excel comparison, add the initial value separately to NPV of the remaining future flows. This is a scenario calculation, not financial advice.
Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste JSON matching the structure in the example. The worked example shows the supported structure and actual output.

How can I compute net present value online?

Paste JSON matching the structure in the example. Set discount rate per period (%). Choose Calculate. Review the output, then copy or download it.

Technical references

Microsoft — NPV and IRR timing conventions

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.