Cloud ROI Calculator

ROI = (total benefit − total cost) ÷ total cost; NPV = Σ (annual net benefit ÷ (1 + r)^t) − up-front investment; payback months = up-front investment ÷ annual net benefit × 12. ROI is the undiscounted ratio of net benefit to total cost, which is easy to quote but ignores the timing of money. NPV fixes that by discounting each year's net benefit back to today at your hurdle rate, so a benefit promised in year three counts for less than the same benefit next year, and a positive NPV means the case clears the hurdle.

Finance approves cloud programmes on NPV and payback, not on percentage savings, and a case that shows ROI without a discount rate is usually challenged on day one. These are planning estimates built from your own assumptions and are not financial advice — have your finance team confirm the discount rate and the benefit definitions.

This calculator takes 5 inputs: Annual benefit realised, Annual cloud run cost, Up-front investment, Appraisal horizon, Discount rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

ROI treats every dollar as equal regardless of when it arrives. If most of the benefit lands in the final year of the horizon, discounting shrinks it enough that the up-front investment is never recovered in present-value terms, so NPV turns negative even though the raw totals look healthy.