Site Reliability Engineering
Error Budget Calculator
Enter SLO target, window, and consumed budget to compute remaining error budget, current burn rate, and projected exhaustion time.
No data is transmitted — everything runs locallyTool
Example — 99.9% SLO · 30-day window · 18 min consumed · 12 days elapsed
Budget (minutes)
43.2
for 99.9% over 30 days
Remaining (minutes)
25.2
after 18 min consumed
Burn Rate
1.04×
Status
ALERTING
About this tool
Error Budget Calculator
The Error Budget Calculator computes remaining error budget, burn rate, time to exhaustion, and multi-window alert threshold comparison from SLO target and consumed budget.
• Check error budget status during an active incident
• Calculate burn rate to determine if a fast-burn alert should fire
• Project error budget exhaustion date at current incident rate
• Communicate error budget status to stakeholders in concrete terms
Affiliate disclosure
Uptime, incident, and on-call management. Better Stack provides status pages, incident management, and on-call scheduling for engineering teams.View error budgets with Better Stack
FAQ
What does this tool tell you?
The Error Budget Calculator computes remaining error budget, burn rate, time to exhaustion, and multi-window alert threshold comparison from SLO target and consumed budget.
What affects the result most?
Error budget = (1 - SLO_target) × window_seconds — the allowed downtime/error volume. Remaining budget = total_budget - consumed_budget. Burn rate = budget_consumed_rate / budget_replenishment_rate — >1 means exhausting faster than accumulating.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.