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How It Works
Amazon EC2 lets you rent virtual machines, called instances, from AWS rather than buying physical hardware. You choose an instance type based on your CPU, memory, and storage needs, select an operating system, and pay for the compute time you use. Instances run in AWS data centers across regions worldwide. You can launch one instance or thousands, and stop paying the moment you shut them down. The Azure equivalent is Azure Virtual Machines. The GCP equivalent is Google Compute Engine.
Why It Matters for Cloud Cost
EC2 is typically the single largest line item on an AWS bill. Because instances run continuously by default, costs compound fast. Teams that pay full on-demand rates for baseline workloads, workloads that run predictably day after day, leave significant savings on the table. AWS offers commitment-based pricing programs such as Reserved Instances and Savings Plans that can reduce EC2 costs by up to 72% versus on-demand rates, but these require upfront decisions about instance type, region, and term length. Getting those decisions wrong results in unused commitments you still pay for.
Key Characteristics
- EC2 instances are billed by the second, with pricing that varies by instance type, region, and operating system.
- On-demand pricing carries a premium over committed pricing, making it the most expensive way to run steady-state workloads.
- AWS EC2 Instance Savings Plans can reduce EC2 costs by up to 72% versus on-demand for a one-year or three-year commitment.
- Commitment decisions, such as instance family and region, must be made in advance, creating financial risk if workloads shift.
How Usage AI Handles This
Usage AI’s Usage Flex Savings Plan covers EC2, Fargate, and Lambda, saving 40 to 60% versus on-demand with $0 upfront and a 1-year commitment term. Usage AI owns the commitment, so your company carries zero financial risk if usage patterns change.
See how Usage AI saves 30 to 50% on AWS, GCP, and Azure.
Common Questions
What is the difference between EC2 on-demand and reserved pricing?
On-demand pricing charges you the full rate for every hour an instance runs, with no commitment required. Reserved Instance pricing, and Savings Plans, offer discounts of up to 72% in exchange for a one-year or three-year usage commitment. The trade-off is that you commit to a baseline level of usage whether or not your workloads stay constant.
How does EC2 relate to AWS Savings Plans?
AWS Compute Savings Plans and EC2 Instance Savings Plans both apply to EC2 usage, reducing your effective hourly rate when you commit to a minimum spend level over a one-year or three-year term. Compute Savings Plans offer more flexibility across instance families and regions, while EC2 Instance Savings Plans lock to a specific instance family and region in exchange for a slightly higher discount of up to 72%.
Can EC2 commitments be adjusted if workloads change?
Standard AWS Reserved Instances have limited flexibility once purchased, and selling them on the AWS Marketplace is not guaranteed. Convertible Reserved Instances allow instance type exchanges but not cancellation. Usage AI’s approach transfers this risk entirely: Usage AI owns the commitment and provides cashback plus credits on any underutilization, so your finance team is protected regardless of how workloads shift.