SLA uptime calculator: allowed downtime
Work out how much downtime your service level agreement (SLA) allows per day, week, month or year.
Choose or enter your availability rate:
%
Per day
1 min 26 s
Per week
10 min 5 s
Per month (30.4 days)
43 min 50 s
Per year (365.25 days)
8 h 45 min 58 s
Understanding SLA figures
A 99.9% availability commitment ("three nines") allows about 43 minutes of downtime per month. For an online shop or a key API, 43 minutes of unavailability can be costly, in sales as well as in trust.
Each extra "9" divides the allowed downtime by ten, but requires a more redundant and more expensive architecture.