By Swati Sahai

Call centers are an operationally-complex element of your business, but they play a big role in your customers’ experience with your company. So how can you balance the need for operational efficiency with meeting customer expectations? It’s no easy task, but the right mix of call center metrics and KPIs can help you stay the course.

Customer service leaders need to tune in to one set of KPIs, but front-line managers need a different view. As Forrester explains in a recent report:

Executives need strategic KPIs to prove the business case for good customer service operations, while operational managers need to gather more comprehensive metrics in near real time to make the right decisions about the management of service requests of their workforce.

There are many call center metrics you can measure, but only a few KPIs that you will want to monitor over a period of time. This definitive list will help you ensure you are not missing out on any essential call center metrics and help make strategic choices about which KPIs to track.
Contact Center Optimization eBook

Customer Experience Call Center Metrics and KPIs

Today, executives are well aware that a single customer service misstep can cause customers to defect. Unfortunately, most call centers need to overcome most customer’s expectation that they will receive less-than-stellar customer service.

Consider this fact: Research has found that Americans spent more than 900 million hours on hold in a single year. That adds up to 40+ days on hold for every person over the course of a lifetime.

According to industry analyst firm CEB, customer satisfaction really suffers after high-effort or time-intensive interactions. Customers cited these as the most frustrating issues, “62% had to re-contact the organization, 56% had to re-explain their issue, 59% were transferred, and 59% had to put forth moderate to high additional effort to resolve their issue.”


Keeping watch on proven customer experience call center metrics can help you determine if your call center operation is living up to customer expectations.

First Contact Resolution (FCR)

First contact resolution (FCR) is a measure of whether customers’ problems are being resolved the first time they reach out to your organization. Many call center leaders view it as the most important KPI to track. Keeping FCR low is crucial, as it not only results in higher customer satisfaction and lower repeat calls but also lower cost-to-serve. Your organization needs to decide on a standard approach for measuring this crucial KPI.

Two common approaches used are:

FCR Call Center Metric



The first approach includes all calls received and produces a lower FCR. However, it may give you a better picture of how well your team is doing with issue resolution on any given day or week.

The second approach produces a more accurate FCR since it excludes repeat calls. Both are used in contact centers, so you must choose the right approach that works for your team and make sure everyone understands your FCR parameters.

Net Promoter Score® (NPS®)

Net Promoter Score (NPS) is a popular metric used to measure customer loyalty and satisfaction. Many companies find NPS appealing because it relies on a simple question:

“How likely is it that you would recommend [company X] to a friend or colleague?”

Customers respond using a 0-10 rating scale, with responses grouped into three categories:
Promoters (9-10)
Passives (7-8)
Detractors (0-6)

NPS Formula for Call Center

(Read more about NPS: How to Calculate NPS Using Journey Analytics)

Customer Effort Score (CES)

Like NPS, customer effort score (CES) uses a single question to gauge customer satisfaction. CES asks customers to evaluate how much effort they had to put in to get their issue resolved. Typical responses range from very low effort to very high effort.
CES can be measured on a five-point or a seven-point scale.

CES example

Companies who use this scoring model can apply this formula to calculate CES:

Customer Effort Score Call Center Metrics and KPIs

Customer Satisfaction (CSAT)

Customer Satisfaction (CSAT) is a very commonly used CX metric to determine how satisfied customers are with your company’s products or services. CSAT is measured at the end of a customer survey, using a five-point scale. Responses can vary from ‘Highly satisfied’ to ‘Highly unsatisfied’.

CSAT scores are often expressed on a scale of 0 to 100 percent. These scores are calculated by using the following formula, with only responses of 4 (satisfied) and 5 (very satisfied) included in the calculation. This is because most CX practitioners believe that using the two highest values on feedback surveys is the most accurate predictor of customer retention.

CSAT Formula

Call Initiation Metrics and KPIs

Customers’ initial contact with a call center has a strong influence on customer perceptions. In your customers’ eyes, choosing to contact your business is an important investment of their time. And how you engage with them shows whether you value their business. In fact, 77% of customers say that valuing their time is the most important thing companies can do to deliver good service.

Even before customers engage with an agent, customers judge your company based on how long they remain on hold—and how you communicate wait times. You can use metrics from this category to gain a view into the critical period between initiation of contact and being addressed by an agent.

First Response Time (FRT)

This KPI gauges the amount of time a customer must wait before connecting with an agent. Often, call centers look at this number daily and weekly, but also evaluate annual trends.

First Response Time Calculation formula

Percentage of Calls Blocked

With this metric, call centers can learn how many customers receive a busy signal when they call. Ideally, this call center metric should be very low for most businesses.

Percentage of calls blocked calculation

If it’s higher than expected, you may need to evaluate whether you have an adequate system for receiving incoming calls. Also, you can also assess whether call lengths are excessive and causing unwanted busy tones for customers.

Average Call Abandonment Rate

If customers are waiting on hold too long, they are likely to abandon calls. Abandoning a call can cause immense frustration for customers and make them lose faith in your company.

Importantly, customers show more willingness to wait on hold for technical support than for a sales transaction. As a general rule, an abandonment rate of less than five percent is considered acceptable, but anything above that level signals a problem.

Call Abandonment Rate formula

Most companies, while using this formula, also exclude calls that abandon in the first five seconds as these calls are typically made by individuals who have dialed a wrong number and realize it in the first five seconds of the call.

Active Waiting Calls

With this metric, you can gain a quick insight into how many calls are being handled by agents and how many are on hold. Typically used in the day-to-day operations of a call center, this KPI can help assess team performance in real time. If too many calls are on hold, you can coach agents to work more efficiently to reduce the call backlog. This can help drive down other critical metrics—including response times and abandonment rates.

Operational Call Center Metrics and KPIs

This set of call center metrics provides a broad view into call center performance over time. By tracking these KPIs, customer service executives can identify peak periods, assess shifting trends, and forecast staffing needs. Managers rely on them to keep tabs on day-to-day operations and achieve strategic contact center optimization goals.

These call center metrics and KPIs can also be used to discern the effect of company initiatives such as product launches and marketing campaigns on call volumes and similar metrics.

Calls Handled

This KPI includes all the calls touched by agents in a specific time frame but it usually does not include abandoned calls. Many organizations break this metric down into two groups of calls:

  • Total Calls handled by an agent
  • Total Calls handled by an interactive voice response (IVR) system

Cost Per Call (CPC)

This metric provides a critical view into operational effectiveness and helps drive resource allocation. It is the average cost for each call handled by a call center.

CPC call center metric

Often, organizations will set a target for this KPI and track whether the call center is over or under that target.

Call Arrival Rate

With this metric, organizations assess how many incoming calls their call center receives in a set time frame. Operational managers may watch this KPI daily, while executives look at trends over time. Depending on their size, businesses may assess the number of calls received by the day, hour, or minute:

Call Arrival Rate

Peak Hour Traffic

Every business needs to monitor the times when the highest volumes of incoming traffic arrive. With this KPI, you can forecast staffing needs and prepare your team for peak periods.

Longest Hold Time Rate

Since waiting on hold is a proven customer pain point, companies must take steps to remedy this pervasive problem. Companies should know the longest time a customer had to wait for an agent—and strive to stay under this hold time.

You can express the longest hold time with this metric: Duration of the longest time a single customer was on hold

Average Call Length

This metric provides insight into the average length of calls in a given period. You can use it to set expectations with your team to help manage their workloads.

Avg. call length formula

Average Age of Query

The Average Age of Query measures the length of time unresolved queries stay open if not resolved on the first attempt. Clearly, shortening the average age of the query is a good goal. A good complement to FCR, this call center metric helps companies see how long it takes to find a solution for outstanding queries.

Avg. age of query formula

Callback Messaging

To avoid long wait times to reach an agent, many companies now offer customers the opportunity to receive a callback. Businesses can track the number of callback requests in a given time to understand how many customers chose this approach. Also, businesses can use this KPI to assess staffing requirements to handle callbacks, improving overall efficiency.

Repeat Calls

Repeat call rate is closely related to First Call Resolutions and helps companies understand the recurrence of certain issues, i.e. problems that did not get resolved in the first call. Tracking repeat call rate can help your company determine and resolve commonly recurring issues that customers face. This can be achieved through communications, self-service options, and agent training.

Repeat call rate calculation

Channel Mix

Today’s call centers do more than answer customer calls. They also have responsibility for handling inquiries that come in through online and mobile channels. Over time, voice contacts will likely fall while other self-service channels grow.

Customer Interaction Anticipation

Percentage of Calls Handled by Type

Many companies find it helpful to analyze the various types of calls they receive. Customer service executives can look at this information across the entire service footprint to understand critical trends. And managers can discern whether their staff allocation aligns with contact types.

Typical types of contacts tracked include:

  • Order Taking/Tracking
  • Questions and Inquiries
  • Customer Support
  • Complaints
  • Inbound Call Redirects

Measure effectiveness of customer service self-help

Agent Productivity Call Center KPIs

Call centers rely on customer-facing agents to handle inquiries efficiently and completely while keeping customers’ at the forefront. With this set of call center KPIs, businesses can understand agent performance at a center-wide, team, or agent level.

Directors and managers can use this insight to motivate higher levels of performance or correct any deficiencies. In addition, they can use this data to celebrate team successes and reward top performers.

Agent Utilization Rate

Since customer service is a labor-intensive function, businesses need to make sure that team members are using their time well. With the agent utilization rate, call centers can assess the productivity of their labor force.
You can get an estimate of agent utilization rate by dividing the amount of work performed divided by work capacity. So if an agent works six hours of an eight hour day, the agent utilization rate would be 75%.

Agent utilization rate formula

However, for a more accurate calculation, you need to factor in variables such as breaks, lunches, training, and vacation and sick days.

Adherence to Schedule

Another productivity related call center metric, adherence to schedule assesses how well agents manage their on-the-job time. When schedule adherence is high, that means you agents are focusing most of their energy on addressing customer issues. Many find an adherence rate of 80% to be a good target.

Call center metrics and KPIs

Calls Answered Per Hour

Understanding how many calls your agents answer per hour is a good measure of productivity. However, you must keep in mind that this number can fluctuate due to seasonal call volumes, shift changes, and other factors.

Calls Answered Per Hour formula

Average Speed of Answer (ASA)

With this critical metric, organizations can assess how long it takes for agents to answer a waiting call. When this metric is too high, it can mean that agents are taking too long on calls—or taking too much time to pick up new calls.

At times, some motivation and coaching are all agents need to improve this metric. In other instances, new processes or work tools may be valuable.

ASA formula

Average Handle Time (AHT)

Average handle time is the average amount of time an agent spends on a call. It starts as soon as the agent picks up the call and ends when they disconnect. By tracking this metric over time, you can determine average handle times for various types of calls—and set a benchmark for your agents.

When you see agents who routinely exceed this threshold, you may need to determine if they have all the skills and tools they need. By contrast, if agents are far below this benchmark, they may be rushing through calls and not addressing customer issues completely.

Avg. Handle time calculate

Average Caller Hold Time While on the Phone with an Agent

At times, agents may need to put a caller on hold to speak with a supervisor or access information about the customer. While these hold times are necessary, call centers should always aim to keep callers on hold for the briefest times possible.

Avg. Hold time

When this number is too high, system issues or agent performance can be the cause.

Transfer Rate

After connecting with an agent, customers do not appreciate being transferred to someone else to handle their calls. Multiple transfers cause even greater frustration.

While some transfers are inevitable, companies should aim to keep them to a minimum. At times, agents may need to connect customers with a supervisor to work through an issue—while other transfers direct customers to other departments.

Transfer rate formula

Average After-call Work Time

Often, agents need to complete some wrap-up work after a customer call. This metrics helps you assess how much time agents spend on post-call work.

If agents spend too much time closing out calls this can signal a problem, such as an agent working too slowly. Creating templates for routine actions or eliminating unnecessary steps could help in this situation.

Avg. after work call time

Tracking Call Center KPIs Across the Customer Life Cycle

Monitoring these KPIs is critical for improving customer experience within the call center and beyond. Contact center interactions have a major impact on overall CX, so it’s crucial to monitor call center KPIs and connect them to end-of-journey and CX success metrics. Enterprises need to select the call center KPIs that capture value for customers and your business.

In general, front-line managers need higher volumes of data that allows them to address issues and opportunities that arise in everyday operations. Executives may need to track fewer call center KPIs, but need insight into critical performance trends.

Importantly, organizations must strive to look beyond the day-to-day—and keep focused on the customer journey. Companies must embrace the truth that the customer experience extends beyond the last interaction and view it as an end-to-end journey across every interaction.

With this in mind, companies can take a more comprehensive look at their call center KPIs. They can understand the typical milestones in customers’ journeys and understand how call centers play a role. Smart companies always view individual interactions in the larger context of customers’ cumulative experiences with the business. They keep a close watch on call center KPIs but always seek to understand data through the lens of the overall customer journey.


In the fast-paced world of call center management, keeping a close watch on core metrics is a must. There are dozens of call center KPIs you can track–but it’s important to select the right ones for your organization. With the right mix of call center KPIs, you can ensure that your organization is maximizing operational efficiency, while never losing sight of customer expectations.

Net Promoter, Net Promoter System, Net Promoter Score, NPS and the NPS-related emoticons are registered trademarks of Bain & Company, Inc., Fred Reichheld and Satmetrix Systems, Inc.