On-Premise vs Cloud TCO Calculator
Compare the total cost of ownership for on-premise infrastructure versus cloud hosting over 3–5 years. Make informed migration decisions with real numbers.
Cloud Migration Cost Estimator
Estimate total cloud migration costs including assessment, data transfer, re-architecture, licensing, and team training. Plan your migration budget.
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Total Migration Cost⧉
$146,050.00
$7,303.00 per server via Replatform (Lift and Reshape)
Current Monthly TCO⧉
$41,000.00
Infrastructure + power/cooling + IT staff
Cloud Monthly Target⧉
$18,000.00
0.56% below current on-prem cost
Net Monthly Savings⧉
$18,943.00
After amortizing migration cost over 36 months
Break-Even Point⧉
7 months
Months until cloud savings offset migration costs
Estimated Timeline⧉
8 months
Base 6 months adjusted for Replatform (Lift and Reshape) complexity
Migration Cost Breakdown
Migration Labor$75,000.00 (51.4%)
Assessment and Planning$10,000.00 (6.8%)
Data Transfer$4,000.00 (2.7%)
Licensing and Tools$16,000.00 (11%)
Security Audit$7,000.00 (4.8%)
Training$15,000.00 (10.3%)
Contingency (15%)$19,050.00 (13%)
5-Year TCO Comparison
| Year | On-Prem (Cumulative) | Cloud (Cumulative) | Net Savings |
|---|---|---|---|
| Year 0 | $492,000.00 | $454,050.00 | +$37,950.00 |
| Year 1 | $984,000.00 | $670,050.00 | +$313,950.00 |
| Year 2 | $1,476,000.00 | $886,050.00 | +$589,950.00 |
| Year 3 | $1,968,000.00 | $1,102,050.00 | +$865,950.00 |
| Year 4 | $2,460,000.00 | $1,318,050.00 | +$1,141,950.00 |
| Year 5 | $2,952,000.00 | $1,534,050.00 | +$1,417,950.00 |
Strategy Comparison
| Strategy | Migration Cost | Expected Savings | Timeline | Risk |
|---|---|---|---|---|
| Rehost (Lift and Shift) | $57,500.00 | 15% monthly | 6 months | Low |
| Replatform (Lift and Reshape) | $86,250.00 | 30% monthly | 8 months | Medium |
| Refactor (Re-Architect) | $143,750.00 | 50% monthly | 12 months | High |
Planning notes, formulas, and examples
About the Cloud Migration Cost Estimator
Migrating to the cloud involves far more than spinning up instances and moving data. The true cost includes assessment and planning, data transfer, application re-architecture, license conversions, team training, and potential downtime during cutover. Most organizations underestimate migration costs by 30–50% because they focus only on the infrastructure component.
This calculator helps you build a comprehensive migration budget by breaking costs into five key categories: assessment (discovery, planning, consultants), data transfer (bandwidth, physical appliances, migration tools), re-architecture (code changes, testing, refactoring), licensing (new cloud licenses, license mobility, decommissioning), and training (team upskilling, certification, documentation).
Whether you're planning a lift-and-shift migration, a re-platforming effort, or a full re-architecture to cloud-native services, this estimator gives you a realistic budget range to present to stakeholders.
When This Page Helps
Cloud migrations regularly exceed budgets because hidden costs are overlooked during planning. Consultant fees, application refactoring, dual-run periods, and team training often account for 40–60% of total migration spend. This calculator ensures you capture all cost categories upfront, reducing the risk of budget overruns and stakeholder surprises.
How to Use the Inputs
- Enter assessment and planning costs (consultants, discovery tools, planning hours).
- Enter data transfer costs (bandwidth, AWS Snowball, or migration tools).
- Enter re-architecture costs (developer hours for code changes and testing).
- Enter licensing costs (new cloud licenses minus decommissioned on-prem licenses).
- Enter training costs (courses, certifications, and onboarding time).
- Review the total migration budget and per-category breakdown.
Formula used
Total Migration Cost = assessment + data_transfer + re_architecture + licensing + training
Cost per Workload = total / number_of_workloads
Monthly Amortized = total / amortization_monthsExample Calculation
Result: $150,000 total migration cost
Assessment ($25K) covers discovery and planning. Data transfer ($15K) covers bandwidth and tools. Re-architecture ($80K) is the largest cost for refactoring 20 applications. Licensing ($20K) covers new cloud subscriptions. Training ($10K) covers team certification. Amortized over 36 months, that's $4,167/month.
Tips & Best Practices
- Include a 20–30% contingency buffer for unexpected migration challenges.
- Prioritize migrating low-risk, high-value workloads first to build team confidence.
- Factor in dual-run costs during the migration period when both environments are active.
- Use cloud provider migration programs (AWS MAP, Azure Migrate) for credits and support.
- Don't forget the opportunity cost of engineering time diverted from product work.
- Plan for a 3–6 month stabilization period after migration for optimization.
The Five Phases of Cloud Migration
Successful migrations follow a structured approach: (1) Assess — inventory workloads, dependencies, and readiness; (2) Plan — select migration strategy per workload and build the timeline; (3) Migrate — execute data and application migration; (4) Optimize — right-size resources and implement cost controls; (5) Operate — establish cloud operations and governance.
Hidden Migration Costs to Budget For
Commonly overlooked costs include: network upgrade costs for increased bandwidth needs, security tool replacements, compliance re-certification, application testing across all environments, knowledge transfer documentation, and the productivity dip during the learning curve. Budget 15–25% of your base estimate for these items.
Post-Migration Optimization
The first 3–6 months after migration are critical for cost optimization. Most organizations initially over-provision cloud resources for safety. After collecting utilization data, right-size instances, implement auto-scaling, convert steady-state workloads to reserved instances, and establish tagging and cost allocation practices.
Sources & Methodology
Last updated:
Frequently Asked Questions
Small migrations (5–10 workloads) typically take 3–6 months. Mid-size (50–100 workloads) take 6–18 months. Enterprise-scale (500+ workloads) can take 2–5 years. Complexity, team size, and migration strategy all affect timelines.
AWS MAP provides consulting support, training, and service credits for large migrations. Organizations committing to significant AWS spend can receive credits covering 15–20% of migration costs, effectively reducing the net investment.
Lift-and-shift is faster and cheaper upfront but may not realize full cloud benefits. Re-architecture takes longer and costs more initially but yields better performance, scalability, and long-term cost optimization. Most organizations use a phased approach.
Estimate developer hours per application based on complexity. Simple stateless apps may need 40–80 hours. Complex stateful applications with database dependencies can require 200–500+ hours. Multiply by your loaded developer cost.
Some licenses (like SQL Server) can use "bring your own license" (BYOL) on cloud. Others require cloud-specific licenses. Windows Server licenses may qualify for Azure Hybrid Benefit. Oracle licenses have specific cloud deployment rules. Review each vendor's cloud policy.
Compare total migration cost plus ongoing cloud costs against projected on-premise costs (including refresh cycles, staffing, and facilities). Most migrations achieve ROI within 2–3 years and deliver ongoing savings of 20–40% versus on-premise.
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