CiberkitAvailability (SLA) calculator
Free99.9% = 8 h 45 min of downtime a year. Check whether you comply this month and compute serial or redundant systems.
Allowed downtime
3 nines
With 99.9 % availability, the service may be down at most:
8 h 45 min
per year
Per month
43 min 49 s
Per week
10 min 4 s
Per day
1 min 26 s
Per quarter
2 h 11 min 29 s
How much does each hour of downtime cost?
Are we meeting the SLA this period?
Meeting it, but barely
18 min 49 s of budget left, but at this rate it will end with 50 min of downtime and miss the SLA.
99.943 %
actual availability
Composite system
In series, if any part fails everything fails (web + database + DNS). In parallel, redundant parts: it only fails if all of them fail.
- %
- %
- %
99.85 %
Together they are worse than the weakest one (Base de datos): each part adds its own downtime.
13 h 8 min
down per year
A year is 365.25 days and a month one twelfth of a year (30.44 days), as in most providers' SLAs. Allowed times are rounded down.