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SLO Calculator
An SLO becomes useful when an availability percentage turns into a concrete error budget — and you can see how quickly the team is burning through it.
Free SLO / Error Budget Calculator
How many failures can you actually afford?
Set the SLO and measurement window. The calculator shows allowed unavailability, the event error budget, budget already consumed, remaining budget, and current burn rate.
Optional. The name is used only in the ready-to-share summary.
For example: 99.9, 99.95, or 99.99. A higher target leaves a smaller error budget.
The period over which the SLO is evaluated. 28- and 30-day windows are common choices.
Total events covered by the SLI: requests, transactions, jobs, or another measurable flow.
Failures or events that did not meet the SLI condition. Use the same unit as the total event volume.
Used for burn rate: consumed budget is compared with the share of the window that has elapsed.
How to read it
Burn rate matters more than pretty nines
An SLO alone does not tell the team whether reliability work is urgent. That becomes visible when the error budget is being consumed faster than time is passing.
A 1× burn rate means the budget is being spent roughly in line with the window. Above 1× is an early signal that, if quality stays the same, the budget will run out before the window ends.