SRE & Reliability Calculators
Precise calculations for the metrics that matter. All calculators run in your browser — no data sent anywhere.
Availability Calculator
Convert uptime percentages to downtime. Calculate nine-nines and SLA targets.
SLO Calculator
Calculate error budgets from SLO targets and service request volumes.
Error Budget Calculator
Calculate remaining error budget and burn rate from incident data.
MTTR Calculator
Calculate mean time to recovery, MTTF, and MTBF from incident logs.
DORA Metrics Calculator
Assess your team's DevOps performance across all four key metrics.
Guides & Explainers
Plain-language explanations of the concepts every SRE needs to know.
What is Observability?
Metrics, logs, and traces — and why the difference matters for modern systems.
SLO vs SLA vs SLI
Clear definitions with real-world examples. The most confused trio in reliability.
Error Budgets Explained
How to define, calculate, and operationalize error budgets on your team.
DORA Metrics Explained
The four key metrics of software delivery performance and how to improve them.