Uptime/Downtime Calculator
Calculate service uptime and downtime based on SLA percentages.
Uptime SLA Calculator
%
Downtime & Uptime per Period
| Timeframe | Allowed Downtime | Required Uptime |
|---|---|---|
| Daily | 1m 26s | 23h 58m 34s |
| Weekly | 10m 5s | 6d 23h 49m 55s |
| Monthly | 43m 50s | 30d 9h 45m 16s |
| Yearly | 8h 45m 57s | 364d 21h 3m 15s |
About SLA & Uptime
A Service Level Agreement (SLA) is a commitment between a service provider and a client. A key component of an SLA is the uptime guarantee, which specifies the percentage of time a service is expected to be operational. This calculator helps translate abstract percentages like "99.9% uptime" into tangible periods of allowed downtime.
The "Nines" of Availability
- 99% (Two Nines): Allows for about 3.65 days of downtime per year. Generally considered poor for modern applications.
- 99.9% (Three Nines): Allows for 8.77 hours of downtime per year. A common standard for many services.
- 99.99% (Four Nines): Allows for 52.6 minutes of downtime per year. A high standard, often requiring automated recovery and redundancy.
- 99.999% (Five Nines): Allows for just 5.26 minutes of downtime per year. The gold standard for high-availability systems, typically found in critical infrastructure like telecommunications.