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Ha Avalability Table

Availability Table - Cheat sheet

Availability levelDowntime per yearDowntime per quarterDowntime per monthDowntime per weekDowntime per dayDowntime per hour
90% (“one nine”)36.5 days9 days3 days16.8 hours2.4 hours6 minutes
95%18.25 days4.5 days1.5 days8.4 hours1.2 hours3 minutes
99% (“two-nines”)3.65 days21.6 hours7.2 hours1.68 hours14.4 minutes36 seconds
99.50%1.83 days10.8 hours3.6 hours50.4 minutes7.20 minutes18 seconds
99.9%(“three nines”)8.76 hours2.16 hours43.2 minutes10.1 minutes1.44 minutes3.6 seconds
99.95%4.38 hours1.08 hours21.6 minutes5.04 minutes43.2 seconds1.8 seconds
99.99%(“four nines”)52.6 minutes12.96 minutes4.32 minutes60.5 seconds8.64 seconds0.36 seconds
99.999%(“five nines”)5.26 minutes1.30 minutes25.9 seconds6.05 seconds0.87 seconds0.04 seconds