What are call centre metrics? Essential contact centre KPIs

Call center metrics are key performance indicators (KPIs) that show how well your customer service team is doing. They measure speed, quality and workload. Think of Average Handle Time (AHT), First Call Resolution (FCR) and customer satisfaction scores. When you track these contact center metrics every day, you spot problems early. You see where callers wait too long, where calls go wrong and where your team needs support. That works for a classic phone team and for a team that also handles chat and WhatsApp.

It’s Monday morning. The phones haven’t stopped since 9:00. Your team feels busy, but are customers actually getting help? Without the right numbers, you’re guessing. This guide explains the call center metrics that matter most, how to calculate each one and why it’s worth tracking.

Why call centre metrics matter

A busy team isn’t always an effective team. Ten people on the phone all day can still leave customers waiting, transfer calls three times or solve the same problem twice.

Call centre metrics turn that gut feeling into facts. They help you answer practical questions:

• Do we have enough people on the phones at 10:00 on a Monday?
• How many callers hang up before we answer?
• Which issues keep coming back?
• Who on the team needs extra coaching, and on what?

You don’t need to track everything. Pick a handful of metrics that match your goals and check them regularly. Below, we split them into three groups: availability, agent performance and customer experience.

Availability metrics: how quickly do you answer?

Average Speed of Answer (ASA)

ASA shows how long callers wait in the queue before someone picks up.

How to calculate it: total waiting time for answered calls ÷ number of answered calls.

Example: 50 answered calls with a total waiting time of 1,500 seconds gives an ASA of 30 seconds.

Why it matters: long waits frustrate callers, and many simply hang up. A rising ASA usually means you have too few people available at that moment.

Call abandonment rate

This is the percentage of callers who hang up before they speak to anyone.

How to calculate it: abandoned calls ÷ total incoming calls × 100.

Example: 400 incoming calls and 32 abandoned calls gives an abandonment rate of 8%.

Why it matters: every abandoned call is a customer who didn’t get help. Some will call back. Some will call your competitor. Many teams don’t count callers who hang up in the first few seconds, as these are often wrong numbers.

Service level

Service level tells you what share of calls you answer within a set time. A common target is 80/20: 80% of calls answered within 20 seconds.

How to calculate it: calls answered within the target time ÷ total incoming calls × 100.

Why it matters: service level is a simple promise you can check every day. It also helps you plan staff. If you hit 95% in the afternoon but only 60% in the morning, you know exactly where to add people.

Call volume and peak times

Call volume is simply the number of calls you receive, per hour, day or week.

Why it matters: it’s the starting point for almost every other metric. When you know your peaks, you can plan shifts, breaks and lunch around them instead of hoping for the best.

Call center agent metrics: how is your team performing?

Call center agent metrics zoom in on individual people and teams. Use them to support and coach, not to punish. A low score often points to a training gap or an unclear process, not a lazy colleague.

Average Handle Time (AHT)

AHT is the average time an agent spends on one call from start to finish. That includes talking, holding and the work after the call, such as writing notes or sending a quick email.

How to calculate it: (total talk time + total hold time + total after call work) ÷ number of calls handled.

Example: 20 calls with 100 minutes of talk time, 10 minutes of hold time and 30 minutes of after call work gives an AHT of 7 minutes.

Why it matters: AHT helps you plan how many people you need. But be careful. Pushing AHT down too hard can lead to rushed calls and customers who need to call back. Look at it together with first call resolution.

If you are looking into voip apps, you are probably trying to understand how to organise business calls.

For resellers, this is often the difference between offering just a voip app and offering a way to organise how calls are handled across a team. Xelion helps structure that setup, so calls are handled in a consistent way.

First Call Resolution (FCR)

FCR shows how often you solve a customer’s question during the first contact, with no need to call back or transfer.

How to calculate it: issues resolved on first contact ÷ total issues × 100.

Example: 340 out of 400 calls resolved the first time gives an FCR of 85%.

Why it matters: FCR is one of the best signs of a happy customer. Nobody likes calling twice. A low FCR can point to gaps in knowledge, missing information or a call routing setup that sends callers to the wrong person.

After call work (ACW)

ACW is the time an agent spends finishing a call: adding notes, updating the CRM or emailing the customer afterwards.

How to calculate it: total after call time ÷ number of calls handled.

Why it matters: high ACW can mean your systems slow people down. If agents have to type a customer’s details into three different places, that’s time they aren’t helping the next caller.

Occupancy rate

Occupancy shows how much of their available time agents actually spend handling calls.

How to calculate it: time spent on calls and after call work ÷ total available time × 100.

Example: an agent who is available for 6 hours and spends 4.5 hours on calls has an occupancy of 75%.

Why it matters: too low and you have more people than you need. Too high, usually above 85% to 90%, and people burn out. Nobody can take call after call all day without a breather.

Transfer rate

The percentage of calls an agent passes on to a colleague or another team.

How to calculate it: transferred calls ÷ total calls handled × 100.

Why it matters: some transfers are normal. A high rate often means callers end up in the wrong queue to begin with. That’s a sign to look again at your IVR menu and call routing.

Customer experience metrics: how do callers feel?

Customer satisfaction score (CSAT)

CSAT measures how satisfied customers are after a call. You usually ask one short question, such as “How happy were you with the help you received?” on a scale of 1 to 5.

How to calculate it: number of 4 and 5 scores ÷ total responses × 100.

Why it matters: it gives you the customer’s view directly. Combine it with FCR and AHT to see the full picture. A short call isn’t a good call if the customer hangs up unhappy.

Net Promoter Score (NPS)

NPS asks how likely a customer is to recommend you, on a scale of 0 to 10. Scores of 9 or 10 are promoters. Scores of 0 to 6 are detractors.

How to calculate it: % promoters minus % detractors.

Why it matters: NPS looks beyond one call. It tells you how customers feel about your company as a whole, and your phone team plays a big part in that.

How to use contact center metrics without drowning in data

Numbers only help when you act on them. A few tips:

• Start small. Pick three to five metrics that link to a clear goal, such as fewer abandoned calls.
• Look at metrics together. A low AHT with a low FCR tells a different story than a low AHT with a high FCR.
• Use real time and historical data. Real time numbers help you react now. Reports over weeks and months help you plan.
• Share the numbers with your team. People can’t improve what they can’t see.
• Use metrics to coach. Listen to calls together and talk about what went well.

How Xelion helps you track call centre metrics

A queue is building up. With Xelion, you see it straight away. The wallboard shows how many callers are waiting, how long the longest caller has waited and which colleagues are available to pick up. You don’t need to walk around the office asking who’s free.

Xelion gives you the features to measure and improve your contact center metrics, all in one licence:

• Wallboard: a live overview of queues, waiting callers and availability, on screen for the whole team.
• Reports: see answered and missed calls, waiting times and call volumes per queue, per hour or per colleague.
• Call queues and hunt groups: route callers to the right team, so fewer calls need a transfer.
• ACD and IVR: send callers to the right person straight away, which helps your first call resolution.
• Call recording: listen back to calls for training and quality checks.
• Listen in and call whisper: support a new colleague during a live call, without the customer hearing you.
• Presence: see who is available, busy or on a break, so you can transfer calls with confidence.

Want to go a step further? Xelion Analysis, part of Xelion Plus, uses AI to transcribe calls, detect caller intent and measure sentiment. So you don’t just see how long a call took. You also see what it was about and how the customer felt.

You can use it all from the office, from home or on the road. Your call center agent metrics stay visible wherever your team works.