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ROI + Payback Period Calculator

See ROI, annualized return, and payback timing before you fund the project.

Your numbers

Start from an example

$
$
$
Analysis years
$
Discount rate

Result

Status: watch.Payback period
42.8 mo
Status: in range.Simple ROI
56%
Annualized ROI
9.3%
Status: watch.Discounted payback
55.8 mo
Status: in range.Net present value
$8,038
Status: in range.Total net gain
$28,000

Cumulative inflow curve

Nominal vs discounted inflow over the analysis horizon.

Y0Y3Y5
Nominal inflow
$78,000
Discounted inflow
$58,038

Scenario ROI spread

Simple ROI by annual-net-benefit scenario.

conservative
$11,200
28%
base
$14,000
56%
optimistic
$16,800
84%

General business information, not legal, tax or financial advice. The result comes only from your inputs and the published method. How we check our numbers.

How to use it

  1. Enter the initial investment, any upfront benefit, annual net benefit, analysis period, residual value, and discount rate. Use your own cost of capital or hurdle rate as the discount rate, higher for riskier projects, and rerun at a second rate to see how sensitive the answer is.
  2. Read nominal payback, simple ROI, annualized ROI, discounted payback, net present value at your discount rate, total net gain, and the year-by-year timeline. If discounted payback never happens inside the analysis window, the project may still look good on headline ROI while failing a real capital-allocation test.
  3. Use nominal payback to judge speed and discounted payback to judge economic quality. A project that pays back in 2 years nominally but misses discounted payback at a 15% hurdle is back-loaded and more fragile than the simple ROI headline suggests.
  4. Run at least three cases by moving annual net benefit 20% down and 20% up. Approve only if the downside case still meets your minimum return threshold or acceptable payback window, especially when the cash outlay is large relative to monthly free cash flow.
  5. Re-run when implementation cost, benefit timing, residual value, or cost of capital changes. Compare forecast payback to actual realized savings quarterly so future ROI cases use your real hit rate instead of optimistic assumptions.

Questions people usually ask

What does this calculator include?

It computes simple ROI, annualized ROI, nominal payback period, discounted payback period, and net present value at your discount rate from user-defined project cashflows.

How is annualized ROI calculated?

Annualized ROI is computed from total nominal inflow versus initial investment over the analysis period using a compounded annual growth formula.

What is discounted payback?

Discounted payback applies your discount rate to future annual cashflows before checking when cumulative value recovers the initial investment.

Is this tool free and private to use?

Yes. AI Biz Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.

Is this professional advice?

No. Outputs are business planning estimates — not legal, tax, or accounting advice.

Background on the ROI + Payback Period Calculator

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Use it from code

The same calculation as a JavaScript module you can import. It runs where you import it, with no request, key or rate limit.

import { compute } from "https://aibizhub.io/engines/roi-payback-calculator.js";

Input and output contract, TypeScript types and the guide for agents.