Cloud Migration ROI Calculator
Cloud migration return.
Calculate cloud migration ROI from current infrastructure cost, cloud cost, migration costs, and productivity gains. Free — no signup.
What this tool does
This calculator models the financial outcome of migrating from on-premises infrastructure to cloud services over a defined period. It compares your current annual infrastructure costs against projected cloud expenses, factors in the upfront migration investment, and adds back estimated productivity gains from the transition. The result shows both the total net benefit accumulated across your chosen timeframe and the return on investment percentage based on the one-off migration cost. The calculation illustrates how annual savings—the difference between current and cloud costs, plus productivity improvements—compound over multiple years to offset the initial migration expense. Outputs are for financial illustration purposes and assume costs and gains remain consistent year-on-year; actual outcomes will vary based on unforeseen operational changes, scaling needs, or cost volatility.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Cloud migration ROI depends on infrastructure savings (cloud vs on-prem annual cost), one-off migration costs, and productivity gains from easier scaling and faster deployments. Typical migrations show 15-30% infrastructure savings in year 1 rising to 30-50% after optimization, plus 20-40% productivity gains from DevOps acceleration.
200k current on-prem annual cost, 130k cloud annual cost after migration = 70k annual savings. Plus 30k productivity gains = 100k total annual benefit. 150k one-off migration cost. Over 3 years: 300k total savings, net 150k, ROI 100%. Payback in 1.5 years. Strong case.
Migration failures usually come from underestimating costs. Cloud costs without optimization can actually exceed on-prem costs for predictable workloads. Only 30-40% of migrations achieve projected savings in year 1 - the rest take 2-3 years after reserved instance purchases, right-sizing, and serverless refactoring to hit promised numbers. Budget with caution.
Quick example
With current infra cost annual of 200,000 and cloud cost annual of 130,000 (plus migration one-off cost of 150,000 and productivity gains annual of 30,000), the result is 100.00%. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Current Infra Cost Annual, Cloud Cost Annual, Migration One-off Cost, Productivity Gains Annual, and Analysis Period (years). Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
What's happening under the hood
Annual savings = infra cost - cloud cost + gains. Total savings = annual × years. Net = total - migration. ROI = net ÷ migration × 100. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
What the score tells you
Headline financial numbers — income, savings, debt — each tell part of the story. This calculation stitches several together into a single read you can track over time. The value is in the direction, not the absolute number.
What this doesn't capture
The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.
££200,000 on-prem - ££130,000 cloud + ££30,000 gains - ££150,000 one-off over 3y = 100.00%.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator computes return on investment by comparing net cost savings against the upfront migration expense. It calculates annual savings by subtracting cloud costs and adding productivity gains from current infrastructure spending. This annual figure is multiplied by the analysis period in years to derive total savings. The migration one-off cost is then deducted to produce net benefit. ROI is expressed as a percentage by dividing net benefit by the initial migration cost and multiplying by 100. The model assumes constant annual costs and gains across the entire period, applies no discount rate to future savings, and does not account for tax effects, financing costs, or changes in infrastructure or cloud pricing over time.
References
Frequently Asked Questions
Are cloud costs really lower?
What costs to include in migration one-off?
Productivity gains - how real?
What about FinOps?
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