What are the 5 key performance indicators of a call center?

These KPIs cover response speed, resolution, handling time and customer feedback. Interpret them together because improving one measure can affect others.

1. Service Level

Service level measures the share of calls answered within a defined time target. For example, a center might set a target of answering 80% of calls within 20 seconds. The calculation should specify how abandoned calls and short abandons are treated.

Service level is affected by demand, staffing and workforce management. Low staffing during busy periods can reduce the share of calls answered within target, while adding staff increases cost. Review service level alongside workload, occupancy and the customer experience you intend to provide.

2. Average Speed of Answer

Average Speed of Answer (ASA) is the average time callers wait in the queue before an agent answers. State whether the calculation excludes abandoned calls, since reporting rules can differ.

ASA provides a useful view of the customer's waiting experience, but it should not be viewed in isolation. A center can reduce ASA by adding more staff, for example, but that decision has a cost. The objective is to find an appropriate balance between customer experience and staffing efficiency.

3. First Contact Resolution

First Contact Resolution (FCR) measures the share of customer issues resolved during the first interaction, without a repeat contact for the same issue within a defined period. Specify how your operation identifies a repeat contact and sets that period.

FCR can help identify whether customers’ issues are being resolved on the first interaction. Interpret it alongside repeat-contact definitions, issue complexity and customer feedback. A change in FCR may affect repeat workload, but the effect depends on the contact mix and measurement method.

4. Average Handle Time

Average Handle Time (AHT) is the average time spent handling an interaction. For calls, it commonly includes talk time, hold time and after-call work. Confirm which components your reporting system includes.

AHT is an input to workload and staffing forecasts, so changes can affect estimated staffing needs. A lower AHT is not automatically better: assess it alongside resolution quality and customer feedback to check whether shorter calls are meeting customer needs.

5. Customer Satisfaction

Customer satisfaction can be measured through CSAT surveys, which capture how respondents rate an interaction. Survey results reflect the customers who respond and the question asked, so they may not represent every customer’s experience.

CSAT adds customer feedback to operational measures such as AHT and service level. If those measures improve while customer ratings decline, review call quality, resolution and the survey method before deciding what to change.

How These Call Center KPIs Work Together

These measures can influence one another. Demand and staffing affect service level and ASA. AHT is an input to workload estimates, while repeat contacts influence future demand. CSAT adds customer feedback, although survey results should be interpreted in light of who responded and how the question was asked.

Managers should set targets that reflect customer needs, operating constraints and cost, then review the measures together rather than maximizing one KPI in isolation.

Forecasting, Erlang analysis and workforce management can help investigate staffing and response-time questions. A KPI dashboard shows measured results; further analysis is needed to identify causes and decide what to change.

Use service level, ASA, FCR, AHT and customer satisfaction together, with each measure’s calculation and limitations clearly defined.