How this calculator works
Enter availability target (%), measurement period (days). Select Calculate to apply the displayed formula and review the labeled results.
Formula / method
Allowed downtime = period × (1 − availability ÷ 100)
Worked example
99.9% availability over 30 days permits 43.2 minutes of downtime.
Assumptions and limitations
Availability is measured uniformly over the entered number of 24-hour days.
SLA exclusions, maintenance windows, partial degradation, request-based availability and rounding may change contractual results.