Calculate how much downtime per year, month, week, and day a given uptime percentage allows.
Free Tool
Uptime Calculator
Calculate uptime percentage and equivalent downtime per year, month, week, and day.
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FAQ
What does 99.9% uptime mean?
99.9% uptime (three nines) allows about 8.77 hours of downtime per year, or about 43.8 minutes per month.
Is this uptime calculator free?
Yes, completely free with no signup required.
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