SLO burn-rate calculator
Estimate budget consumption at an observed error rate, with explicit assumptions.
Free to use. Save a file draft or explicitly enable storage on this device.
Current result
Enter the objective and both event counts.Incomplete or uncertain. Review the fields and warnings.
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File drafts are available without browser storage. Current draft matches the last save or initial state.
Inputs & calculation
Enter the objective and both event counts.
Use windows ending together. Overlapping windows must not be added. Low traffic and missing telemetry need separate handling; neither is established by these numbers.
Results
Review and export
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SLO burn-rate calculator report
SLO burn-rate calculator User-entered draft; verify against source evidence. Tool version 2 · https://aiopssre.com/slo-burn-rate-calculator/ Name: Untitled Scope: SLI: Not specified SLO: 99.9% over 30 days. Enter the objective and both event counts. This is a threshold illustration, not a configured alert. Windows must end together and use the same eligible population and SLI. Normalized spend assumes steady traffic; actual remaining rolling budget is not measured here.
| Window | Eligible events | Bad events | Duration | Burn rate |
|---|---|---|---|---|
| Long | 1 hours | Invalid | ||
| Short | 5 minutes | Invalid |
How the burn-rate calculation works
Burn rate = observed bad-event fraction ÷ (1 − SLO target). At 99.9%, a 1% bad-event fraction is 10× burn. Over one hour in a 30-day period, the normalized budget spend is about 1.39%. At a constant rate, a full budget lasts 72 hours. This is an approximation when request volume changes, not the measured remaining budget.
Use and review the result
Set a clear service and time window, check source data, then save the worksheet with your evidence. Downloads are editable; browser print can save a PDF. Illustrative examples are not production results.
Read the accompanying guide · Source and further reading
Calculation and worksheet review: September 29, 2026.