SLO/SLA Calc

iPhone and iPad - Version 1.0

SLO/SLA Calc

Availability, downtime, and error budget calculations for real system design work.

Model series, parallel, N:M, and device availability. Save reusable blocks, combine them into bigger systems, then compare the result against a target SLO.

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What it does

Availability tools in one place

System availability

Calculate series, parallel, and N:M designs with component availability values.

Device availability

Estimate device availability from MTBF, spares, EOL status, support agreement, and repair time.

Saved scenarios

Save systems and devices as reusable blocks, then build larger systems from them.

Downtime lookup

Translate an availability percentage into downtime per day, week, month, or year.

SLO calculation

Compare a saved system against a target SLO and see whether error budget remains.

Reference guide

Review definitions for availability, reliability, SLO, SLA, measured availability, and error budget.

How it works

From components to SLO fit

  1. Choose System Availability or Device Availability.
  2. Enter component values, MTBF details, or measured uptime and downtime.
  3. Calculate and save useful subsystems as scenarios.
  4. Combine saved scenarios into larger series or parallel systems.
  5. Use Insights to compare the calculated availability against a target SLO.

Design principle

Start with a target SLO, model the system, and compare the calculated downtime against the allowed downtime. Remaining budget suggests the design meets the target. A large remaining budget may indicate an over-engineered design.

Privacy

Local-first calculator

SLO/SLA Calc does not collect analytics, does not show ads, does not track users, and does not send calculations or saved scenarios to a server.

Saved data

Saved scenarios are stored locally on the device using the app's local storage. Deleting the app removes the app's local saved data from the device.

Support

Need help or want to share feedback?

Email support@sloslacalc.app. Feedback from real availability design work is what will shape future versions.