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Availability Table (90%-99.999% Uptime)

Availability Table (90%-99.999% Uptime)

Better Stack Team
Updated on May 4, 2022

Availability (uptime) is calculated as a time a given service was unavailable over a specified period of time. For example to reach 99.9% availability over a period of a month, the maximum allowed downtime is 43.2 minutes.

The availability table below shows how much downtime is permitted to achieve a desired availability level.

Availability level Allowed unavailability window
(uptime) per year per quarter per month per week per day per hour
90% 36.5 days 9 days 3 days 16.8 hours 2.4 hours 6 minutes
95% 18.25 days 4.5 days 1.5 days 8.4 hours 1.2 hours 3 minutes
99% 3.65 days 21.6 hours 7.2 hours 1.68 hours 14.4 minutes 36 seconds
99.5% 1.83 days 10.8 hours 3.6 hours 50.4 minutes 7.20 minutes 18 seconds
99.9% 8.76 hours 2.16 hours 43.2 minutes 10.1 minutes 1.44 minutes 3.6 seconds
99.95% 4.38 hours 1.08 hours 21.6 minutes 5.04 minutes 43.2 seconds 1.8 seconds
99.99% 52.6 minutes 12.96 minutes 4.32 minutes 60.5 seconds 8.64 seconds 0.36 seconds
99.999% 5.26 minutes 1.30 minutes 25.9 seconds 6.05 seconds 0.87 seconds 0.04 seconds
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