Downtime Calculator
Convert uptime percentage into downtime allowance.
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Calculate downtime allowance
Service-level targets such as 99.9 percent uptime are easier to understand as minutes of downtime. Enter uptime percentage and period days to calculate allowed downtime. It is useful for SLA reviews, hosting comparisons, status reporting and reliability planning.
Percentage to minutes
The calculator converts the unavailable percentage into minutes over the period you enter.
Frequently asked questions
How much downtime is 99.9 percent uptime?
It depends on the period. For 30 days, it is about 43.2 minutes.
Does this count scheduled maintenance?
That depends on your SLA. Include or exclude it according to the policy you are measuring.
Can I enter yearly periods?
Yes. Enter 365 days or your reporting period.