AWS Migration Cost Calculator
Calculate the true cost of migrating to AWS — including egress fees, cutover downtime, parallel running, staff retraining, and the hidden costs most migration estimates miss.
What drives AWS migration cost
Data transfer & egress
$0.09/GB on most source clouds. 100 TB = ~$9,200.
Parallel running period
Pay both old + new environments for 3–18 months.
Staff retraining
3–5 days per engineer × team size × daily rate.
Re-architecture work
Typically +20–50% on engineering budget for refactors.
AWS support plan
Enterprise support = 10% of monthly AWS spend.
Rollback contingency
Budget 15–25% of project cost for rollback scenarios.
Where are you migrating from?
Select your current infrastructure environment.
Frequently asked questions
How much does an AWS migration typically cost?
AWS migration costs vary enormously by workload size and complexity. Small workloads (under 20 servers) may cost $50,000–$200,000 all-in. Mid-market enterprises typically spend $500,000–$3M. Large enterprise migrations of 500+ workloads regularly exceed $10M when you include re-architecture, training, parallel running, and professional services. AWS migration estimates that don't include these hidden costs are typically 40–60% understated.
What are the biggest hidden costs of migrating to AWS?
The most consistently underestimated AWS migration costs are: (1) data egress fees during the migration itself ($0.09/GB on the source cloud), (2) parallel running costs where you pay for both old and new environments simultaneously for 3–18 months, (3) staff retraining from on-prem or other cloud skills to AWS-specific services, (4) right-sizing and performance tuning post-migration, and (5) AWS Enterprise support plan costs (10% of monthly AWS spend).
How long does an AWS migration take?
A small workload migration to AWS takes 2–4 weeks. Mid-size applications typically take 3–6 months including testing. Enterprise data center migrations of 500+ workloads using a wave-based approach typically take 12–24 months. The parallel running period during this time is a major cost driver — every month of dual running is typically $50,000–$500,000 in combined infrastructure spend.
Does AWS offer migration credits or funding?
Yes. AWS Migration Acceleration Program (MAP) provides funding, credits, and professional services support for enterprise migrations. Credits of $1–5M are available for large migrations. MAP funding typically covers 25–40% of migration costs. To qualify, work with an AWS Partner or contact your AWS account team — MAP is best accessed before the migration project is formally scoped.