Free Tool

Network Uptime Calculator

Calculate allowed downtime at every SLA level, estimate the financial impact of outages, and understand what each “nine” of availability really means for your business.

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Approximate revenue your business generates per hour
Used to calculate productivity loss during downtime

Complete SLA Reference

SLA LevelDowntime / MonthDowntime / YearTier NameTypical Use
99%7h 18m3d 15h 36mTwo NinesBudget hosting, dev/test
99.5%3h 39m1d 19h 48mStandard broadband
99.9%43m 50s8h 45m 36sThree NinesBusiness-grade services
99.95%21m 55s4h 22m 48sEnterprise cloud
99.99%4m 23s52m 34sFour NinesHigh-availability
99.999%26s5m 15sFive NinesCarrier-grade

Downtime is calculated as (1 - SLA%) × total hours in the period. Monthly = 730 hours, yearly = 8,760 hours. Actual SLA terms vary by provider. Talk to our network team

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