How is a composite SLA calculated?

For services in series (each depends on the next), you multiply the individual SLAs. For example, two services at 99.9% each give a composite SLA of 99.9% x 99.9% = 99.8%. For redundant (parallel) services, the formula accounts for the probability that all redundant instances fail simultaneously.

Are the SLA values in this tool guaranteed by Google?

The tool uses SLA percentages from Google Cloud's published SLA documentation. Actual SLA terms, credits, and conditions are governed by your agreement with Google Cloud. Always verify against the official GCP SLA page for contractual commitments.

GCP SLA Calculator

MonitoringGCP

Calculate composite SLA for multi-service GCP architectures.

Architecture Services

Add GCP services in your architecture as serial dependencies. Enable redundancy per service to model parallel availability.

Service #1

Service

SLA (%)

Redundant deployment

Raw JSON

Output will appear here...

About This Tool

The GCP SLA Calculator computes composite SLA percentages for multi-service Google Cloud architectures. When your application depends on multiple GCP services chained together, the effective uptime guarantee is the product of each service's individual SLA. This tool lets you select services, specify redundancy configurations (single region, multi-region, zonal), and instantly see the composite SLA along with expected monthly and yearly downtime. It helps architects make informed decisions about redundancy trade-offs.

When to Use This Tool

•Calculate the composite SLA for a web application architecture that chains Cloud Run, Cloud SQL, and Cloud CDN.
•Compare the effective uptime of a single-region deployment versus a multi-region deployment for the same set of GCP services.
•Present stakeholders with expected downtime numbers when proposing architecture changes or cost optimizations.
•Identify the weakest SLA link in a service chain to prioritize where to add redundancy.

Frequently Asked Questions

How is a composite SLA calculated?: For services in series (each depends on the next), you multiply the individual SLAs. For example, two services at 99.9% each give a composite SLA of 99.9% x 99.9% = 99.8%. For redundant (parallel) services, the formula accounts for the probability that all redundant instances fail simultaneously.
Are the SLA values in this tool guaranteed by Google?: The tool uses SLA percentages from Google Cloud's published SLA documentation. Actual SLA terms, credits, and conditions are governed by your agreement with Google Cloud. Always verify against the official GCP SLA page for contractual commitments.

Disclaimer: This tool runs entirely in your browser. No data is sent to our servers. Always verify outputs before using them in production. AWS, Azure, and GCP are trademarks of their respective owners.