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High Availability Percentage Calculation



Availability %
Downtime per year
Downtime per month
Downtime per week
Downtime per day
90% ("one nine")
36.5 days
72 hours
16.8 hours
2.4 hours
95% ("one and a half nines")
18.25 days
36 hours
8.4 hours
1.2 hours
97%
10.96 days
21.6 hours
5.04 hours
43.2 minutes
98%
7.30 days
14.4 hours
3.36 hours
28.8 minutes
99% ("two nines")
3.65 days
7.20 hours
1.68 hours
14.4 minutes
99.5% ("two and a half nines")
1.83 days
3.60 hours
50.4 minutes
7.2 minutes
99.80%
17.52 hours
86.23 minutes
20.16 minutes
2.88 minutes
99.9% ("three nines")
8.76 hours
43.8 minutes
10.1 minutes
1.44 minutes
99.95% ("three and a half nines")
4.38 hours
21.56 minutes
5.04 minutes
43.2 seconds
99.99% ("four nines")
52.56 minutes
4.38 minutes
1.01 minutes
8.64 seconds
99.995% ("four and a half nines")
26.28 minutes
2.16 minutes
30.24 seconds
4.32 seconds
99.999% ("five nines")
5.26 minutes
25.9 seconds
6.05 seconds
864.3 milliseconds
99.9999% ("six nines")
31.5 seconds
2.59 seconds
604.8 milliseconds
86.4 milliseconds
99.99999% ("seven nines")
3.15 seconds
262.97 milliseconds
60.48 milliseconds
8.64 milliseconds
99.999999% ("eight nines")
315.569 milliseconds
26.297 milliseconds
6.048 milliseconds
0.864 milliseconds
99.9999999% ("nine nines")
31.5569 milliseconds
2.6297 milliseconds
0.6048 milliseconds
0.0864 milliseconds
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