High Availability • Error Budgets • Outage Analysis
SLA Uptime & Downtime Calculator
Calculate exact allowed downtime budgets across daily, weekly, monthly, and yearly windows for high-availability cloud targets.
99.9% Uptime
%
Daily Downtime
1m 26s 400ms
per 24 hoursWeekly Downtime
10m 4s 800ms
per 7 daysMonthly Budget
43m 49s 746ms
per 30.4 days (Standard SLA)Yearly Downtime
8h 45m 56s
per 365.25 days99.9% Uptime SLA Guaranteed on AZBrand Cloud VPS
High-availability NVMe compute nodes with automatic failover and 1 Gbps unmetered network ports from $3.99/mo.
The High Availability “Nines” Reference Matrix
High Availability (HA) tiers are universally benchmarked in “Nines”. Every additional nine reduces acceptable downtime by an order of magnitude, dictating required server redundancy, active-active clustering, and automated database failovers.
| Availability Tier | Daily Downtime | Monthly Downtime | Yearly Downtime |
|---|---|---|---|
| 99.0% (Two Nines) | 14m 24s | 7h 18m 17s | 3d 15h 39m |
| 99.9% (Three Nines) | 1m 26s | 43m 49s | 8h 45m 57s |
| 99.95% (High Tier) | 43.2s | 21m 54s | 4h 22m 58s |
| 99.99% (Four Nines) | 8.64s | 4m 22s | 52m 35s |
| 99.999% (Five Nines) | 864ms | 26.3s | 5m 15s |
SRE Knowledge Base