SLA Uptime Calculator
Calculate the maximum allowed downtime for any SLA uptime target.
Per Year
8h 46m
allowed downtime
Per Month
44m
allowed downtime
Per Week
10m
allowed downtime
Per Day
1m
allowed downtime
SLA Quick Reference
Common SLA tiers and their maximum allowed downtime.
| SLA Level | Per Day | Per Month | Per Year |
|---|---|---|---|
| 99% | 14m | 7h 18m | 3d 15h 40m |
| 99.5% | 7m | 3h 39m | 1d 19h 50m |
| 99.9% | 1m | 44m | 8h 46m |
| 99.95% | 43s | 22m | 4h 23m |
| 99.99% | 9s | 4m | 53m |
| 99.999% | 1s | 26s | 5m |
What is an SLA?
A Service Level Agreement (SLA) is a commitment between a service provider and a customer that defines the expected level of service availability. SLA uptime is typically expressed as a percentage — for example, "99.9% uptime" (often called "three nines") means the service can be down for at most 8 hours and 46 minutes per year. The more nines in the SLA, the less downtime is tolerated and the more robust the infrastructure needs to be.
How to use this calculator
Enter your target uptime percentage or select a common SLA tier to instantly see the maximum allowed downtime per day, week, month, and year. Use this to evaluate whether your cloud providers meet their SLA commitments, or to plan your own infrastructure reliability targets.