SLO/SLA Calc

One-time purchase with no ads, no subscriptions, and no in-app purchases. Model availability, build reusable systems, evaluate SLOs, and share professional PDF reports.

SLO/SLA Calc helps engineers, architects, and operators model availability and evaluate system designs before deployment.

Calculate availability for series, parallel, and N:M designs. Estimate device availability using MTBF, MTTR, spare availability, support agreements, EOL status, and repair time. Save devices and subsystems as reusable Blocks, combine them into larger Systems, visualize the resulting architecture, and compare performance against a target SLO.

Use SLO/SLA Calc to:

• Calculate system and device availability
• Translate availability percentages into downtime per day, week, month, or year
• Save devices and subsystems as reusable Blocks
• Build larger Systems by connecting Blocks in series or parallel
• Include optional output-switch availability in parallel stages
• Visualize complete Systems and verify their structure
• Compare calculated availability against a target SLO
• See the remaining error budget or the amount over budget
• Generate and share professional PDF system reports
• Review definitions for availability, reliability, SLO, SLA, error budgets, measured availability, and calculated availability

SLO/SLA Calc works offline and stores saved Blocks and Systems locally on your device. No account is required.