Free tool

SLA uptime and downtime calculator

Three nines: how much downtime is 99.9%

What is uptime?

Uptime is the amount of time that a service is available and operational, typically expressed in percentage.

What is SLA?

A service-level agreement (SLA) defines the level of service you expect from a vendor, laying out the metrics by which service is measured, as well as remedies or penalties should agreed-on service levels not be achieved.

How to prevent downtime?

Redundancy, monitoring and alerting are key to ensure a safe and reliable service.

Percentiles matter.

99.9% uptime equals to a period of downtime of 1 minute and 26 seconds per day.

99.99% uptime equals to a period of downtime of less than 9 seconds per day.

99.999% uptime equals to a period of downtime of less than 1 second per day.

What is the uptime percentage?
Daily1m 26s
Weekly10m 5s
Monthly43m 12s
Quarterly2h 52m 48s
Yearly8h 45m 36s
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