SLA Uptime Calculator
Calculate how much downtime your SLA actually allows. Understand what 99.9%, 99.99%, or 99.999% availability really means for your service.
Calculate Your Allowed Downtime
Downtime Breakdown
How It's Calculated
Downtime = Total Time × (100% - Uptime%)
Common SLA Levels
| SLA | Per Day | Per Week | Per Month | Per Year |
|---|---|---|---|---|
| 99% | 14m 24s | 1h 40m | 7h 18m | 3d 15h |
| 99.9% | 1m 26s | 10m 4s | 43m 49s | 8h 45m |
| 99.95% | 43s | 5m 2s | 21m 54s | 4h 22m |
| 99.99% | 8.6s | 1m | 4m 23s | 52m 33s |
| 99.999% | 0.86s | 6s | 26s | 5m 15s |
What is Uptime?
Uptime is the percentage of time a system, service, or website is operational and accessible. It's a key metric for measuring reliability and is typically expressed as a percentage of the total time in a given period.
Understanding SLA Levels
Service Level Agreements (SLAs) define the expected uptime for a service. The "nines" terminology refers to the number of 9s in the uptime percentage:
- 99% (Two Nines) - Allows about 3.65 days of downtime per year
- 99.9% (Three Nines) - Allows about 8.76 hours of downtime per year
- 99.99% (Four Nines) - Allows about 52.56 minutes of downtime per year
- 99.999% (Five Nines) - Allows about 5.26 minutes of downtime per year
Why Uptime Matters
Every minute of downtime can impact your business through lost revenue, damaged reputation, and decreased customer trust. Understanding your SLA helps you set realistic expectations with customers and plan your infrastructure accordingly.
Frequently Asked Questions
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