Planning
Uptime Calculator
Calculate SLA percentages, allowed downtime, and understand five-nines availability. Plan maintenance windows within your SLA constraints.
Availability Target
%
99%99.9%99.99%99.999%
How to Use
- 1Enter your target uptime percentage or select a common preset
- 2Use the slider for fine-grained control between 99% and 99.9999%
- 3View the allowed downtime for different time periods
Common SLA Tiers
| Uptime | Yearly | Monthly | Daily |
|---|---|---|---|
| 99% | 3d 15h 36m | 7h 18m | 14m 24s |
| 99.9% | 8h 45m 36s | 43m 48s | 1m 26s |
| 99.95% | 4h 22m 48s | 21m 54s | 43s |
| 99.99% | 52m 34s | 4m 23s | 8.6s |
| 99.999% | 5m 15s | 26s | 0.9s |
| 99.9999% | 31.5s | 2.6s | 86ms |
Achieving High Availability
- Redundancy: Eliminate single points of failure with redundant components
- Load Balancing: Distribute traffic across multiple servers
- Auto-failover: Implement automatic failover mechanisms
- Monitoring: Real-time monitoring with alerting systems
- Maintenance Windows: Schedule maintenance within downtime budget
SLA vs Reality
An SLA is a contractual commitment, not a guarantee. Consider:
- SLAs often exclude "scheduled maintenance" from downtime calculations
- Compensation for missed SLAs is typically service credits, not refunds
- Higher availability tiers require significantly more investment
- Each additional "nine" is exponentially harder and more expensive to achieve
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