Benchmark analysis

Reserved Instance vs On-Demand

Reserved Instance vs On-Demand cloud pricing benchmarks for AWS, Azure, and GCP. Real discount ranges by commitment term, coverage rates, and the.

Key points

The Most Consistent Savings Opportunity in Cloud

If there is a single cloud optimization action that produces the most predictable, highest-ROI result for enterprise organizations, it is increasing Reserved Instance (RI) and Savings Plan coverage of steady-state compute workloads. The price gap between on-demand and reserved rates is the largest, most defensible discount available in cloud, and yet the median enterprise captures only 55-65% of the potential savings.

This article is part of our Cloud Pricing Benchmarks: AWS vs Azure vs GCP Complete Guide. Here we focus on the RI vs on-demand price gap across all three major cloud providers, what the discounts actually look like, how coverage rates vary by enterprise maturity, and how to bridge the gap between where most organizations are and where the top quartile operates.

Based on analysis of enterprise cloud contracts: the average enterprise with $10M annual compute spend leaves $1.8-2.4M on the table annually through suboptimal RI/Savings Plan coverage. The full savings potential is there every single year, it simply requires systematic commitment management to capture it.

AWS: Reserved Instances and Savings Plans

AWS offers two main commitment mechanisms that deliver discounts versus on-demand: Reserved Instances and Savings Plans. Understanding both is essential for maximizing coverage.

AWS Reserved Instance Discount Benchmarks
RI TypeTermPaymentDiscount vs On-DemandBest For
Standard RI1 yearNo Upfront30 to 40%Predictable compute, flexibility needed
Standard RI1 yearAll Upfront38 to 45%Cash available, cost certainty needed
Standard RI3 yearNo Upfront45 to 55%Stable architecture, 3+ year horizon
Standard RI3 yearAll Upfront55 to 65%Maximum savings, highest confidence workloads
Convertible RI1 yearNo Upfront20 to 30%Workloads that may change instance family
Convertible RI3 yearNo Upfront35 to 45%Long commitment with flexibility to convert
AWS Savings Plans: More Flexible, Similar Discounts

AWS Savings Plans were introduced as a more flexible alternative to Reserved Instances. They deliver comparable discounts but can apply to any EC2 instance type across regions (Compute Savings Plans) or within a specific instance family and region (EC2 Instance Savings Plans).

Savings Plan TypeTermDiscount RangeCoverage
Compute Savings Plan1 year20 to 37%Any EC2, Fargate, Lambda
Compute Savings Plan3 year33 to 54%Any EC2, Fargate, Lambda
EC2 Instance Savings Plan1 year30 to 45%Specific instance family, any size in region
EC2 Instance Savings Plan3 year50 to 66%Specific instance family, any size in region

"For most enterprises, AWS Savings Plans have replaced Reserved Instances as the preferred commitment mechanism. The flexibility to apply savings across any instance size in a family eliminates the primary operational complexity of RIs, resizing and modernizing instances, without sacrificing meaningful discount depth."

Azure: Reserved VM Instances and Azure Savings Plan

Azure mirrors AWS's two-track approach with Azure Reserved VM Instances (fixed to instance series) and Azure Savings Plan for Compute (flexible across instance types). Azure also benefits from Azure Hybrid Benefit layering on top of RI discounts for Windows Server workloads.

Azure Reserved Instance Discount Benchmarks
Reservation TypeTermDiscount vs On-Demand (Linux)With Hybrid Benefit (Windows)
Azure Reserved VM Instance1 year35 to 45%55 to 65%
Azure Reserved VM Instance3 year50 to 60%65 to 75%
Azure Savings Plan for Compute1 year20 to 35%40 to 55%
Azure Savings Plan for Compute3 year35 to 50%55 to 68%

The Azure Hybrid Benefit effect is substantial. For enterprises with Windows Server workloads and Software Assurance, Azure Reserved Instances with Hybrid Benefit can deliver 65-75% discounts versus on-demand, outpacing equivalent AWS discounts for the same workload type. This is the primary reason Azure often wins on economics for Microsoft-ecosystem enterprises.

Benchmark Your RI Coverage

We analyze your cloud compute spend and identify your RI/Savings Plan coverage gaps, quantifying the annual cost of under-reserving.

Contact Us

GCP: Committed Use Discounts vs On-Demand

GCP's commitment mechanism (Committed Use Discounts) works differently from AWS and Azure in an important way: CUDs commit to resource amounts (vCPU/memory) rather than to specific instance types. This provides more flexibility post-commitment but requires resource-level forecasting.

GCP Commitment TypeTermDiscount vs On-DemandFlexibility
Resource CUD (Compute)1 year28 to 35%Any N1/N2 machine type in region
Resource CUD (Compute)3 year46 to 57%Any N1/N2 machine type in region
Spend CUD (Cloud SQL)1 year20%Any Cloud SQL in region
Spend CUD (Cloud Run)1 year17%Cloud Run minutes in region
Sustained Use Discount (automatic)No commitmentUp to 30% on 100%-running instancesAutomatic, no commitment required

Note: GCP's Sustained Use Discounts (SUDs) provide automatic discounts even without any commitment, up to 30% for instances running 100% of a month. This means GCP's effective baseline rate for always-on workloads is already discounted relative to AWS's on-demand pricing before any CUDs are applied. The CUD discount stacks on top of SUD: a 3-year CUD provides 46-57% off on-demand, but the on-demand rate it's discounted against is already lower than AWS's equivalent due to SUD.

Enterprise RI Coverage Benchmarks: Where Organizations Stand

Knowing the discounts available is only part of the picture. The other critical variable is coverage rate, what percentage of eligible compute spend is actually covered by reservations or commitment programs.

Enterprise Maturity LevelAWS RI/SP CoverageAzure Reservation CoverageGCP CUD Coverage
Unoptimized (bottom quartile)25 to 45%20 to 40%20 to 40%
Median enterprise55 to 65%50 to 62%50 to 62%
Top quartile80 to 90%78 to 88%75 to 87%
Best-in-class88 to 95%85 to 93%82 to 90%

The implication: bridging from median (60%) to top-quartile (85%) coverage on a $10M compute bill saves approximately $2.2M annually. This calculation assumes a blended RI discount of 40% (conservative) and applies the incremental savings from the additional 25% of compute moved from on-demand to reserved pricing.

The True Cost of Under-Reserving: A Worked Example

To make this concrete, let's model the cost of under-reserving for a representative enterprise.

Scenario: Company with $15M annual AWS compute spend

That $1.54M is available every year. It doesn't require contract negotiation with AWS. It doesn't require a new vendor. It requires purchasing Savings Plans for workloads that are already running, already predictable, already steady-state.

Why don't organizations capture it? Our interviews with FinOps teams identify three recurring obstacles:

  1. Perceived risk of over-commitment. Teams are concerned about committing to capacity that might not be needed. The solution: commit at 80-85% of current steady-state, not 100%. This leaves buffer for reduction.
  2. Lack of visibility into steady-state vs variable workloads. Without proper tagging and cost allocation, it's difficult to know which workloads are truly steady-state. Investment in cloud cost management tooling solves this.
  3. Organizational disconnect between FinOps and engineering. Engineers provision on-demand; FinOps doesn't have authority to purchase commitments. This governance gap costs millions annually.

RI and Savings Plan Strategy: Best Practices

Start With Savings Plans, Not Reserved Instances

For AWS, start new reservation programs with Compute Savings Plans rather than Standard Reserved Instances. Compute SPs cover all EC2 instance types and sizes in any region, eliminating the risk of stranded RIs when workloads resize or migrate. The discount is slightly lower than Standard RIs for identical commitments, but the operational simplicity justifies it for most enterprises.

Tier Your Commitment Strategy by Confidence Level

Not all workloads have equal predictability. A tiered approach:

Automate RI Management

Manual RI/Savings Plan management at enterprise scale is not sustainable. Tools like AWS Cost Explorer, Azure Advisor, and GCP Cost Intelligence generate automated recommendations for RI purchases. Third-party tools (Spot.io, Apptio, CloudHealth) provide portfolio-level optimization across all three clouds simultaneously.

Benchmark: enterprises using automated RI recommendation tools achieve 8-12% higher coverage rates than those managing reservations manually, per our data. The investment in tooling pays back within 1-2 months.

Conclusion: The Reservation Action Plan

Reserved Instance and Savings Plan optimization is the foundational layer of cloud cost management. No other single action produces more predictable, more sustained savings. Your action plan:

  1. Audit current coverage rates. Pull RI/SP coverage for AWS compute, Azure reservation coverage, and GCP CUD coverage. Compare to the benchmarks above.
  2. Identify the coverage gap value. Calculate the on-demand spend that could be reserved, multiply by the applicable discount rate, and quantify the annual savings opportunity.
  3. Segment workloads by commitment confidence. Identify Tier 1 (3-year), Tier 2 (1-year), and Tier 3 (spot/on-demand) workloads.
  4. Purchase Savings Plans for immediate coverage expansion. AWS Compute Savings Plans are the fastest path to coverage improvement with lowest operational risk.
  5. Set a coverage target. 85% of eligible compute covered by reservations is achievable for most enterprises within 90 days. Make it a team objective with clear ownership.

The companies that consistently optimize cloud costs don't have better tools or better vendors. They have better discipline about reserving what they know will run, and they validate that discipline against benchmark data to know when they're falling short. Start benchmarking your coverage today.

Table of Contents

RI Coverage Benchmark

We analyze your cloud bills to show exactly where your RI/Savings Plan coverage falls short, and what it costs annually.

Contact Us

Cloud Pricing Index 2026

Full benchmark data on reserved pricing, coverage rates, and commitment optimization strategies.

Download Free

Frequently Asked Questions

What is the discount for a 1-year Reserved Instance on AWS?

AWS 1-year Standard Reserved Instances (No Upfront) typically provide 30-40% discount versus on-demand for general-purpose instances. 3-year No Upfront provides 45-55% discount. All Upfront for a 3-year term delivers 55-65% discount. Exact discounts vary by instance family, region, and operating system. Convertible RIs offer 5-10% less discount but allow converting to different instance families.

How does AWS Savings Plans compare to Reserved Instances?

AWS Savings Plans offer similar discounts (up to 66% off on-demand) but with significantly more flexibility. Compute Savings Plans apply to any EC2 instance type and size across regions, eliminating the risk of stranded RIs when workloads resize or migrate. For most enterprises, Savings Plans are now the preferred commitment mechanism over traditional Reserved Instances.

What is the optimal RI/Savings Plan coverage rate for an enterprise?

Top-quartile enterprises achieve 80-90% RI/Savings Plan coverage of eligible compute spend. The median enterprise sits at 55-65%. The gap between 65% and 85% coverage on a $10M annual compute spend represents approximately $2.2M in missed savings annually. Target 85% coverage as a sustainable benchmark, leaving 15% for genuinely variable workloads and operational buffer.

Related reading

All Analysis

Pricing data and source text from the VendorBenchmark library. Co-sell reading is this site’s.