SLA Uptime & Downtime Calculator
Convert an uptime percentage (99.9%, 99.99% …) to allowed downtime per day, month and year — or the reverse — free online.
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Allowed downtime = (1 − availability) × time period. 99.9% ("three nines") allows 8.76 hours a year; 99.99% allows 52.6 minutes; 99.999% about 5.3 minutes. Enter an SLA percentage, or the downtime you had to get the actual availability.