s
Murugan Andezuthu Dharmaratnam | 04 July 2023 | 347

In this article I will give you an example of how a composite SLA for azure services can be calculated.

## Azure SLA Board

```SL No	Service Name	SLA
1	Azure SQL Database	99.995
2	App Service	99.95
3	Azure Active Directory	99.99
4	Azure Key Vault	99.99
5	API Management	99.99
6	Event Grid	99.99
7	Azure Front Door	99.99
8	Azure Storage	99.99
9	Azure Monitor	99.9
10	Azure Data Factory	99.9
```

Composite SLA for App Services = (0.9995) ^ 3 Composite SLA for other services = 0.99995 * 0.9999 * 0.9999 * 0.9999 * 0.9999 * 0.9999 Overall composite SLA = Composite SLA for App Services * Composite SLA for other services = .997952 Note : The SLAs for Azure Monitor and Azure Data Factory have not been included in the calculation.

```Apologies for the confusion earlier. Let's calculate the downtime in both days and hours based on the SLA of 99.7952%.

To calculate the downtime in days, we can use the formula:

Downtime (in days) = (1 - SLA) * Total days in a year

Assuming a standard year of 365 days, you can calculate the downtime in days:

Downtime (in days) = (1 - 0.997952) * 365

Downtime (in days) ˜ 0.002048 * 365

Downtime (in days) ˜ 0.74752 days

To calculate the downtime in hours, we can use the formula:

Downtime (in hours) = Downtime (in days) * 24

Downtime (in hours) ˜ 0.74752 * 24

Downtime (in hours) ˜ 17.94 hours

Therefore, based on the given SLA of 99.7952%, the estimated downtime would be approximately 0.74752 days or 17.94 hours per year.
```