Teams ask us about cloud migration cost constantly, and the answer nearly always comes down to fit. Cloud migration cost has two parts: the one-off cost of the move itself, and the ongoing run cost afterwards - and people often forget the second. The migration cost is driven by the number and complexity of workloads, the approach (rehost vs re-architect), and data volume; the run cost depends on resources and how well they're right-sized.
Quick summary
- Cloud migration cost has two parts: the one-off cost of the move itself, and the ongoing run cost afterwards - and people often forget the second.
- The migration cost is driven by the number and complexity of workloads, the approach (rehost vs re-architect), and data volume; the run cost depends on resources and how well they're right-sized.
- An accurate estimate starts with an assessment and a cost model of your actual workloads - not a headline per-server figure.
"How much will cloud migration cost?" is the right question to ask before committing - but it has two answers that are easy to conflate: the one-off cost of migrating, and the ongoing cost of running in the cloud afterwards. Get either wrong and the project disappoints. This guide explains what drives each, the hidden costs, and how to build an estimate you can trust.
Two kinds of cloud cost
| One-off (migration) | Ongoing (run) | |
|---|---|---|
| What it is | Planning, moving, testing, cutover | Monthly cloud resource bills |
| Driven by | Workloads, approach, data volume | Resources used and right-sizing |
| Risk | Underestimating effort | Surprise bills from over-provisioning |
Key takeaway: The ongoing run cost is the one people forget - and it lasts forever. A migration that ignores it can move to the cloud and end up paying more than before.
What drives the migration cost
- Number and complexity of workloads to move.
- Approach per workload - rehost (cheaper) vs re-platform or re-architect (more effort).
- Data volume - large datasets take planning to migrate safely.
- Dependencies and integrations that must be reconnected.
- Testing and a low-downtime cutover.
What drives the ongoing cost
- Compute, storage and database resources - and how well they're right-sized.
- Managed services and serverless (pay-for-use) vs always-on servers.
- Data transfer and egress charges.
- Reserved capacity or savings plans for steady workloads.
- Non-production environments left running when idle.
How to estimate it properly
Start with an assessment: inventory your workloads, their resource needs and current costs. Then model the target architecture in the cloud's pricing calculator using realistic, right-sized resources - not a copy of on-premise sizing, which inflates the run cost. Add the one-off migration effort (planning, moving, testing) and budget for optimisation afterwards. The result is a realistic total-cost picture, including the ongoing bill, rather than a misleading per-server headline.
Want a real cloud migration estimate?
We'll assess your workloads, model both the migration and ongoing run cost, and recommend the approach that gives the best value - with no surprise bills.
How Acqurio Tech can help
We plan, cost and deliver cloud migrations with cost control built in:
- Cloud & DevOps - migration planning, delivery and cost optimisation.
- Azure and AWS - accurate, platform-specific cost modelling.
- Hire DevOps engineers - pre-vetted cloud migration talent.
Conclusion
Cloud migration cost is two numbers, not one: the one-off cost to move and the ongoing cost to run - and the second is the one most often underestimated. Estimate by assessing your workloads, modelling a right-sized target architecture, adding the migration effort, and budgeting for optimisation. Do that before you commit and you avoid the classic trap of moving to the cloud only to pay more than before.
This article was originally published on Acqurio Tech.
Related: Cloud & DevOps · Azure · AWS
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