Understanding Error Budget Consumed
How we calculate. Allowed downtime = period × (1 − SLO/100); consumed % = downtime ÷ allowed × 100. See our methodology and accuracy policy .
Real-world scenario: A typical Error Budget Consumed case uses slo (%) 99.9 and period length 43200. Enter the same figures below to reproduce the worked path.
What is Error Budget Consumed?
SRE planning metric. Over 100% means you have exhausted the budget for the period.
- SLO is availability target (e.g. 99.9)
- Period and downtime same unit
- >100% = budget exhausted
The Formula
Worked Example
Common Use Cases
- Release freezes: budget gates
- SRE reviews: burn rate narrative
- Multi-service SLOs: compare burn
Pro Tips
- Align downtime with SLO filter
- Track remaining % as 100 − consumed
- Use rolling windows when contracts require
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
Limitations: Error Budget Consumed results are educational DevOps/FinOps planning aids—not SLAs or billing guarantees. Confirm definitions with your platform and finance policies.
Common mistakes
- Swapping part and whole: The denominator must be the full total, not a subset.
- Rounding too early: Carry extra decimal places through multi-step work before rounding the final percent.
- Mixing percent and decimal forms: Enter rates in the format the calculator labels expect.
When to use this calculator
- Use this page when your wording matches error budget consumed and the form labels on screen.
- Use percent of a number for “what is X% of Y?” problems.
- Use number is what percent when you know part and whole and need the percent.
Still unsure about error budget consumed? Start with the quick answer above, then open the linked calculator that matches your wording.
❓ Frequently Asked Questions
How do I use this error budget consumed calculator?
For error budget consumed, enter the values labeled on the form, then press Calculate. Compare the result to the worked example on this page.
What formula does this page use?
See the quick answer and formula box above for error budget consumed—the same percentage calculator expression is applied to your inputs.
What if my result looks wrong?
When checking error budget consumed, re-check part vs whole (or rate vs base), rounding, and whether percents were entered as 25 rather than 0.25 when the form expects percents.
Authoritative References
For DORA and FinOps definitions, consult:
- DORA — Four Keys research and definitions
- Google SRE books — SLOs and error budgets
- FinOps Foundation — cloud cost practices