SLA/SLO Calculator - Free Error Budget & Burn Rate Tool
Calculate SLA uptime, SLO targets, error budgets, and burn rates with our free online calculator for SRE and DevOps teams. Essential for implementing Site Reliability Engineering practices and managing high availability systems. Learn more in our SLA vs SLO vs SLI guide.
Example: Error Budget Calculation
SLO Target:
99.9% uptime (Three Nines)Monthly Error Budget:
43 minutes 50 seconds of allowed downtimeBurn Rate (at 0.2% error rate):
2× (budget exhaustion in ~15 days)What You Can Calculate:
- • Uptime percentage to downtime conversion
- • Error budget remaining and consumption
- • Burn rate for current incident load
- • Allowed downtime per month/quarter/year
- • Cost of downtime based on revenue
- • SLA tier comparisons (99.9% vs 99.99%)
- • Time to exhaustion at current burn rate
Common SLA Tiers:
- • 99% (Two Nines) - 3.65 days/year downtime
- • 99.9% (Three Nines) - 8.77 hours/year
- • 99.95% - 4.38 hours/year downtime
- • 99.99% (Four Nines) - 52.6 minutes/year
- • 99.999% (Five Nines) - 5.26 minutes/year
All calculations happen in your browser. Also try our MTBF/MTTR Calculator for reliability metrics or Backup Recovery Calculator for RTO/RPO planning.
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Frequently Asked Questions
Common questions about the SLA/SLO Calculator
SLI (Service Level Indicator) is a quantitative measurement of service health (e.g., 99.5% of requests succeed). SLO (Service Level Objective) is your internal target. SLA (Service Level Agreement) is a contractual commitment to customers with penalties for violations. SLOs should be stricter than SLAs to provide a buffer.
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ℹ️ Disclaimer
This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to or stored on our servers. While we strive for accuracy, we make no warranties about the completeness or reliability of results. Use at your own discretion.