Skip to content

AWS Pricing Models - Runbook & Reference

中文 · GitHub source Facts verified against official AWS documentation: 2026-08-19

Overview

AWS prices services on a pay-as-you-go basis: you pay only for what you use, with no upfront contracts, and you can save by committing to usage or using spare capacity. Understanding the pricing models (On-Demand, Savings Plans, Reserved Instances, Spot, and the Free Tier) helps you control cost while meeting availability needs.

Key concepts

  • On-Demand: pay per use (per second/minute/hour or per request/storage unit depending on service) with no commitment; flexible but most expensive per unit.
  • Savings Plans: commit to a consistent amount of compute usage (1 or 3 years) for lower prices than On-Demand, with flexibility across instance families/Regions depending on plan type.
  • Reserved Instances: commit to specific instance configurations (1 or 3 years, Standard or Convertible) for discounted EC2/RDS/Redshift/etc.; regional and zonal scopes.
  • Spot Instances: use spare EC2 capacity at significant discounts for fault-tolerant, interruptible workloads; capacity can be reclaimed with notice.
  • Dedicated Hosts/Instances: physical isolation for licensing and compliance needs.
  • Free Tier: limited free usage for eligible services in the first 12 months, always-free offers, and trials.
  • Volume discounts: usage aggregated across an organization (consolidated billing) can qualify for tiered discounts.
  • Data transfer: outbound data transfer and cross-Region traffic are billed; inbound is typically free.
  • Price List API: programmatically query current service pricing (bulk JSON/CSV).

Common operations

# Price List API examples
aws pricing get-products --service-code AmazonEC2 \
  --filters 'Type=TERM_MATCH,Field=instanceType,Value=m5.large'

# Cost tools
aws ce get-cost-and-usage --time-period Start=2026-08-01,End=2026-08-19 \
  --granularity MONTHLY --metrics UnblendedCost
aws budgets create-budget --account-id 123456789012 --budget file://budget.json \
  --notifications-with-subscribers file://notifications.json

Best practices

  • Start with On-Demand, then add Savings Plans/Reserved Instances for steady-state workloads.
  • Use Spot for stateless, fault-tolerant work (batch, CI, ML training) with interruption handling.
  • Track usage and costs with Cost Explorer, budgets, and Cost Anomaly Detection.
  • Consolidate billing in AWS Organizations to share volume discounts and reservations.
  • Review outbound data transfer; use CloudFront/Direct Connect where they reduce cost.
  • Estimate new workloads with the AWS Pricing Calculator before building.

Troubleshooting

Symptom Checks and fixes
Bill higher than expected Use Cost Explorer and data exports to find the top services; check data transfer and underused resources.
Savings Plans not covering usage Check coverage/utilization in the Savings Plans console and adjust purchase recommendations.
Spot instance terminated Verify the workload handles interruption (checkpoints, queues) or use Capacity Rebalancing.
Free Tier charges Confirm the service/usage is within free tier limits and the account is not past 12 months.
Prices in API look wrong Filter by Region/term attributes; the Price List API includes many dimensions.

Limits

Pricing models and discounts vary by service, Region, and commitment terms. See the AWS pricing pages and Price List API documentation for current details.

Official references