Uptime SLA — Service Level Agreement
The minimum availability percentage guaranteed by the service provider. An SLA of 99.9% equates to ~8.7 hours of downtime per year; four nines (99.99%) only allow ~52 minutes annually.
SLA
The minimum availability percentage guaranteed by the service provider. An SLA of 99.9% equates to ~8.7 hours of downtime per year; four nines (99.99%) only allow ~52 minutes annually.
Uptime% = (total time − downtime) ÷ total time × 100
Derivatives & related terms
- 99.9% SLA (Three Nines)
- 99.99% SLA (Four Nines)
- MTTR
- MTBF
- RTO
- RPO
- SLO
- SLI
- default penalty
- status page
SEO tip
Recurring downtime has a negative impact on Google's crawl budget. Set up real-time monitoring with Uptime Robot or Better Uptime to detect incidents before Googlebot.
Source: Georgia Business & Technology Glossary by Del-Ops Technology & Consulting Team. Last Updated: February 2026.