Stellar customer support should be a priority of every organization, and relying on call center metrics can help you get there. Call center software automates the flow of incoming and outgoing calls. These tools offer reporting and analytics so you can measure the effectiveness of those calls.

There are certain metrics and key performance indicators (KPIs) that you’ll need to track in real-time, which deal with how calls are handled, which calls are not received, and how satisfied the customer is with the interaction. Let’s take a look at 15 critical metrics that need to be monitored for success:

The following list is a comprehensive overview at KPIs you should look for in your call center software. We’ll break down what each metric is, why it’s valuable and how you can calculate it. 


Channel Mix

Channel mix refers to the number of ways your customers can reach your support team. By providing your customers with a number of ways to reach you, you can easily pinpoint which is your most popular channel. Popular customer service channels include phone, social media, email live messaging and self-service websites. 

Although they’re not quite as focused on additional messaging channels like contact center agents are, this is still useful to call center agents. With this information, you can dedicate more representatives to that particular channel. This ensures your team can help the most customers in the most efficient way possible. A higher number of interactions can easily lead to higher satisfaction. 

You can easily get this number by measuring the total number of customer service sessions per channel. 


Average Call Occupancy Rate

The call occupancy rate is the measurement of your agents’ pace of work and how efficient they are. Aiming for a higher occupancy rate is ideal, as that means there will be less time between calls. However, a 100% occupancy rate might not be feasible, as that means your agents could burn out.

The general consensus amongst call center software is that an occupancy rate of 85 to 90% is a reasonable goal rate to target. Keeping a close eye on this call center metric ensures you are spreading out your agents’ bandwidth in the most effective way possible. Monitoring your agents’ call occupancy rate can have a direct impact on your customers’ satisfaction. 

Calculating this requires counting the call volume made during a shift or set period. Resources like Erlang Calculators make this fairly easy to measure.


First Call Resolution (FCR)

When your agents are equipped to resolve a customer issue the first time a customer reaches out, there’s a higher chance that the customer will receive the first call resolution (FCR) they are looking for. FCR is a direct measurement of customer satisfaction.

The higher that number is, the odds are your customer loyalty number will be higher, making your call center more profitable. Consider measuring this with a customer relationship management (CRM) integration that tracks all aspects of a customer’s interactions with a brand.

In order to track this KPI, use the following formula: 

The number of customer issues/inquiries resolved in a single call ÷ the total number of incoming calls that have had their issues resolved.


Call Abandonment Rate

Your call center abandonment rate is the measurement of the number of calls that end when a customer hangs up the phone before a callback or resolution is made. Call center performance hinges on providing callers with the best customer service experience. 

The entire contact process should be optimized so that the customer stays on the line. Fixing your IVR call flow and creating self-service options are a few ways to reduce the number of hang-up results since this minimizes the customer hold time. 

A call abandonment rate between 5 and 8% is deemed to be in the acceptable range. Also, for those reaching prospects on smartphones, mobile call abandonment rates tend to be higher – sometimes as high as 20%.

This call center metric is measured by the total number of abandoned calls ÷ the total number of incoming calls


Average Handle Time (AHT)

average handle time formula

Source: Fonolo

This call center metric is the average time it takes for an agent to resolve a customer issue. Shorter interactions typically correlate with customer satisfaction, which is why this metric and FCR are so important for call center success. 

It’s important to keep in mind that shorter AHT isn’t necessarily a metric for success, as having agents rush through calls is counterintuitive. This would be detrimental to agent performance. Attempting to shorten AHT without compromising the quality of the interaction is something center managers should strive for.

To measure your center’s average handle time, use this formula:

The total talk time of the agent + the total time customers have spent in the queue + the after-call work time. Divide that total by the total number of incoming calls.


Cost Per Contact (CPC) 

Cost per Contact (CPC) is measured in the total annual/monthly operating expenses of the center divided by the volume of calls made in the same period. This is purely a call center metric that measures your team’s efficiency. 

The time period you choose to measure the cost of is key — a week may be too short, and a quarter could be too long. Measuring the cost per contact over a month is a good starting point, as it’s enough time to measure common trends.

For example, if one call center has a cost of $10.00 per contact and another center halves that price, then the one running at $5.00 per contact has higher efficiency.

To track this call center metric, use this formula:

The amount of calls per month or year ÷ the operating costs plus average agent salary


Customer Churn Rate (CCR)

customer churn rate

Source: Acquire

Your customer churn rate (CCR) is the number of customers that decide to cut ties with your business. Different businesses have different qualifications for what is considered losing a customer — it mainly depends on the nature of your business and what type of service/product you offer. Before you can measure this rate, you have to define what your organization considers to be a lost customer.

Keeping tabs on this metric is important for obvious reasons — no one wants to lose customers. But that can happen at any given time. Naturally, you want a number on the lower end here. The fewer customers you lose equals less business and revenue lost. But this is also something that’s completely subjective to your business. You can look to competitors in your industry for a good number to go off of, or just measure this number based on your revenue. 

Since a churn rate of zero is impossible, there is such a thing as a good churn rate. It’s up to your business to calculate that target rate and deploy strategies as to not increase it. CCR works in tandem with a host of additional call center KPIs and metrics. These tools are focused on improving your customer service offering. By providing the best customer experience possible, your CCR should remain on the lower end. 

You can calculate this rate with the formula below:

Divide the number of customers lost during a specific time period by the number of customers you started that time period off with. Multiply that number by 100. 


Average Speed of Answer (ASA)

The average speed of answer (ASA) is the speed in which an agent responds to waiting customers. If the wait is too long, the chance that a customer will hang up and have a poor customer experience increases.

Measuring the ASA can help you determine if agent efficiency needs to increase. Follow the 80/20 rule to see whether or not your ASA is acceptable — 80 percent of calls answered within 20 seconds. This is particularly important for those businesses with SLAs that establish a certain amount of calls needed to be made and a certain response time that should be met within a preset period.

It’s important to consider all outliers when measuring your ASA. For example, a poorly-staffed lunch hour could easily harm your organization’s ASA. Studying your Call Abandonment Rate at peak hours can help to improve this number if needed,

To measure your center’s ASA, use this formula:

The total wait time for answered calls ÷ The total number of answered calls


Customer Satisfaction (CSAT)


CSAT score

Source: LTVplus

Simply asking your customers, “How pleased were you with our service level?” is an excellent tool for evaluating the effectiveness of your call center scripts as well as the satisfaction levels for your products or services. Creating the most effective customer satisfaction survey possible is the best way to measure this.

Completed customer satisfaction surveys are calculated into a CSAT score by adding the total number of points received by an agent and then dividing the number of surveys completed. Keep in mind that this is different from an NPS, which measures loyalty. 

To measure your agent’s CSAT scores, use this formula:

The total number of surveys administered x The total numeric satisfaction score. Divide that number by the total number of surveys administered.


Customer Retention Rate

Customer Retention Rate (CRR) measures the percentage of existing customers still utilizing your organization’s services within a certain period of time. The higher your CRR rate, the higher your revenue will be.

Happier customers may spread the word about your organization to people within their network. Those existing customers will also be 40 percent more likely to purchase a new product or service than you. This all starts with the service level provided by your call center employees.

You can find your organization’s CRR by subtracting the number of new customers over a certain period from the total number of customers at the end of that same period. Divide that by the number of customers at the start of that period. Multiply that number by 100.


Net Promoter Score (NPS)


Source: Medium

Your organization’s NPS is a measurement of how likely customers are to stay with your organization. The most straightforward way to perform this quality assurance is to collect this number is by sending out surveys measuring satisfaction to your customers. 

These surveys can be as short as one question asking how likely they are to recommend you to their network. They can be expanded to include more questions in order to better understand what your customers like/dislike. With a higher NPS score, you’ll likely have a higher CRR. This, of course, will likely lead to higher revenue. 

Customers who complete the survey fall into one of three categories — promoters (those who give a score of 9 or 10), passives (those who give a score of 7 or 8), and detractors (those who give a score between 0-6).

You can calculate your NPS with the following formula:

(Number of promoters ÷ total number of surveys) – (Number of promoters ÷ total number of surveys)


Percentage of Calls Blocked

Blocked calls also are considered calls that are sent to voicemail or tell customers to call back later. When your call center is swamped with customer calls, sometimes the inbound customers end up with busy signals due to full call queues. Blocked calls happen for two critical reasons:

  • There are no available agents
  • Call queues are configured to play a busy tone when full

Finding out the percentage of calls blocked will help you determine if you have an adequate number of agents answering calls and it will also help you determine if your system’s queuing capabilities are up to snuff. Finally, it’ll help you understand if your agents are spending too long on calls.

To measure your center’s percentage of calls blocked, use this formula:

The total number of calls that do not reach your agents ÷ The total number of incoming calls


Agent Absenteeism and Turnover

One key statistic that directly affects the percentage of calls blocked is agent absenteeism and turnover, which is why it’s essential to measure agent schedule adherence. Having your agents stick to their scheduled shifts reduces the chance of missed or abandoned calls significantly. 

Workforce management tools make tracking agent absenteeism and turnover relatively easy and are considered one of the must-have features in a contact call solution. Using this helps your center develop a budget and optimize best practices for your personnel. 

To measure agent absenteeism, use this formula:

The total time that an agent is available ÷ The total time that the agent is scheduled for shifts


Average Call Transfer Rate

The average call transfer rate is a call center metric that monitors how many calls end up transferred to a different department or are sent to the supervisor level. 

Due to poor IVR call flow or wrong touchtone inputs, callers can be misrouted through your system and will be transferred to different departments. Some transferring is inevitable, but your call center should be optimized to reduce the number of bounces. 

To find this rate, use this simple formula:

The number of calls transferred ÷ the total number of handled calls


Customer Effort Score


Source: TecnoVoz

Your call center is there to help your customers, but it shouldn’t be hard for them to reach you — that’s what a customer effort score (CES) measures. Your support team should always aim to deliver a low-effort experience for your customers. This number is typically gathered through a survey, just like an NPS score. All you need to do to gather this information is simply to ask your customers if they agree that your company made it easy for them to solve their issue. This number is typically measured on a scale of 5 or 7, with the higher number being what you want to aim for.

This number is valuable because it can help you measure and predict customer loyalty. If customers don’t consider your support offering easy to work with, they may move onto one of your competitors. Using your average score in tandem with your NPS is a good way to get a bird’s eye view of what your customers think of your company. If one of those numbers drop, it’s safe to assume the other will as well. When those numbers dip into a low range, you’ll unfortunately be able to expect a loss of customer base as well. 

Use the following formula to calculate your CES:

CES = % of customers that agree – % of customers that disagree. 


Good Customer Service Leads to More FCRs

The more an agent personalizes the call and creates a connection with the customer, the less likely they will hang up during the call. Well trained agents should have a higher rate of resolution, especially if they are taking inbound calls. If your FCR is low, additional training may be required. 

On our page, we lay out several options with the pros and cons of each to help you find software that will help your call center agents be more efficient during their interactions.