How to Calculate SLA Percentage

Whether you are an MSP proving your value or a client holding a vendor accountable, knowing how to calculate SLA percentage is a mandatory skill.

Step 1: Define the SLA Metric

First, identify what you are measuring. Are you calculating an SLA violation rate for response times, or an availability percentage for a server? The metric dictates the data you need to gather.

Step 2: Gather the Data

If you are calculating a response time SLA percentage, pull a report of all tickets created in the period and the time of the first response. If calculating uptime, pull the total minutes of verified downtime.

Step 3: Apply the Formula

For help desk tickets:

(Tickets meeting SLA / Total Tickets) * 100

If you answered 400 out of 500 tickets on time: (400/500) * 100 = 80%.

For availability:

((Total Minutes - Downtime Minutes) / Total Minutes) * 100

In a 30-day month (43,200 minutes) with 120 minutes of downtime: ((43,200 - 120) / 43,200) * 100 = 99.72%.

Using an SLA Percentage Calculator

To avoid manual math and easily attach financial penalties to these percentages, use an automated tool.