What Is an SLA and How Do You Measure It?
A Service Level Agreement (SLA) defines the performance standard your business commits to. Learn how to set, measure, and report on SLAs.
Key Takeaways
- An SLA is a commitment to deliver a service at a defined standard — usually measured as response time, resolution time, or uptime
- SLA compliance rate = tickets resolved within SLA ÷ total tickets × 100
- Missed SLAs damage customer trust; consistently hitting SLAs builds it
- Internal SLAs between teams improve operational reliability without contractual obligations
What an SLA is
A Service Level Agreement is a defined commitment — between a business and its customers, or between internal teams — specifying the level of service that will be provided. Common SLA metrics include: first response time (how quickly you acknowledge a support request), resolution time (how quickly the issue is fully resolved), and uptime (the percentage of time a system or service is available). SLAs are often tiered by priority — a critical outage gets a 1-hour response SLA; a low-priority feature request gets a 5-business-day SLA.
How to measure SLA compliance
SLA compliance rate = (tickets resolved within SLA target ÷ total tickets in period) × 100. A compliance rate of 95% means 5% of customer interactions violated your commitment. Track this weekly, by priority tier and by team, so you can see whether the problem is structural (SLA targets are unrealistic) or operational (certain ticket types or agents consistently miss targets).
Setting realistic SLA targets
SLA targets should be set based on your actual operational capability, not aspirationally. Committing to a 1-hour response when your team is working across three time zones with 8 agents is a recipe for consistent SLA breaches. Start with data: what is your current median first response time? Set your SLA target at or slightly above that baseline, then improve over time. It is far better to commit to 4 hours and consistently deliver in 2, than to commit to 1 hour and routinely miss it.
Internal SLAs
SLAs are not only for customer-facing commitments. Internal SLAs between departments — finance to operations, engineering to customer success — improve coordination and accountability without contractual stakes. An internal SLA for finance to process expense reports within 5 business days creates a shared performance standard that both teams can track and discuss.