Start with workload requirements, not the advertised VM price
Define the workload in measurable terms: average compute hours, maximum simultaneous users, memory constraints, throughput, object storage growth, database replicas, request volume and geographic destinations. A low hourly rate can be misleading if a different number of instances is needed to meet performance goals.
Compute cannot be compared on vCPU labels alone
Virtual CPUs, burst credits, hyper-threading, shared-core allocation and Oracle OCPUs are not equivalent billing units. Define the minimum benchmark and availability objective first. Then measure the instance types which can satisfy the target without unacceptable latency.
Separate direct usage and operational overhead
Calculate virtual machines, managed databases, storage and egress independently. Add monitoring, backups, load balancers, availability zones, API gateways, security tooling, licenses, staff time and support plans. Many vendor calculators exclude at least some of those costs by default unless you add them explicitly.
Check transfer allowances at the account and service level
AWS documentation describes an aggregate internet transfer free allowance; Oracle publishes a substantial monthly outbound transfer allowance. Google Cloud Premium Tier egress can be destination- and volume-dependent. Because service-specific exceptions exist, check the billing page for the actual product, source region, destination and account before using a free threshold in a business case.
Document assumptions for procurement
Retain your source links, region, purchase model, operating system and calculation date. Save a low, expected and stress scenario, and compare spending over twelve months. Test the estimates against actual bills during a pilot deployment.
Launch four-cloud comparison ↗
FAQ
Which provider is cheapest?
There is no universally cheapest provider. Cost depends on exact workload, negotiated discounts, traffic patterns, target regions, architecture and compliance requirements.
Does 2 vCPU always mean equal performance?
No. Burstable, shared-core and OCPU-based compute products have different performance characteristics. Compare benchmarked CPU and memory requirements before interpreting price differences.
Why do egress fees matter?
Outbound data can accrue a separate network bill. Tier, traffic destination, cache configuration, free allowance, region and transfer direction affect the amount charged.