Networking & IT Tools
Network Uptime SLA Calculator
Enter an uptime percentage (like the classic 99.9%) to see how much downtime that allows per year, month, week, and day.
Per year
8h 45m 36s
Per month
43m 12s
Per week
10m 5s
Per day
1m 26s
Converts an SLA uptime percentage (like the classic "three nines" = 99.9%) into allowed downtime over different periods, using a 365-day year and 30-day month.
How to use this tool
- 1Enter an uptime percentage.
- 2See the equivalent allowed downtime over different periods.
Frequently asked questions
What does '99.9% uptime' actually mean in practice?+
99.9% ('three nines') allows about 8.76 hours of downtime per year — each additional nine cuts the allowed downtime by roughly a factor of ten.