Call Center KPIs That Matter and How to Read Them

A small set of call center KPIs tells you most of what you need to know: service level, average wait, abandon rate, average handle time, missed calls, occupancy and first-call resolution. Each one answers a different question about what callers experience or how your team spends its time. This guide explains what every number means and what to change when one is off.

Service level: the headline number

Service level is the share of calls answered within a target time. A common target is answering 80% of calls within 20 seconds, which is a rule of thumb to start from. An urgent line needs a tighter target than general enquiries, and because the target is set per queue, sales and support can be measured differently.

Read it by hour as well as by day. A day that closes at a healthy figure can contain a lunch hour where the level collapsed, and the daily number hides what those callers experienced.

Average wait and abandon rate

Average wait, also called average speed of answer, is how long callers waited before an agent picked up. Always look at the longest wait beside it. A short average with a longest wait of several minutes means a few callers were effectively forgotten.

Abandon rate is the share of callers who hung up before anyone answered. Some leave in the first few seconds because they dialled the wrong number, and no staffing change will keep them. The useful view is a breakdown of when callers give up: within 10 seconds, 30 seconds, a minute, and so on. Abandons after a minute point to a waiting problem. Abandons while the menu is playing point to an IVR problem. QuipCalls reports include this breakdown, and our guide to reducing abandoned calls covers the fixes.

Average handle time: talk plus wrap-up

Average handle time (AHT) is talk time plus the wrap-up time that follows, when the agent writes notes and picks a call category. It tells you how much capacity one call consumes, which is the figure you need for staffing.

Treat AHT as a planning number. Pressuring agents to shorten calls usually produces rushed conversations and repeat calls. Look at the spread instead:

• An agent far above the team average may need coaching or easier access to information.
• An agent far below it may be closing calls before the issue is solved.
• A rise across the whole team often points to a product issue or a confusing process.

Listening to recordings, or scoring them with a quality evaluation scorecard, shows which it is.

Missed calls, occupancy and break time

A missed call is one that rang an agent and was not answered, or that arrived outside working hours. Count missed calls separately from abandoned ones. Abandoned calls are about queue capacity. Missed calls are about an agent marked available who was away from the desk, or about hours nobody covers.

Occupancy is the share of logged-in time agents spend on calls and wrap-up. Very low occupancy means you are overstaffed for that period. Very high occupancy across a whole shift leaves agents no breathing room, and quality tends to suffer. A report of break time by reason, such as prayer, lunch or training, shows whether breaks cluster in one hour and leave the queue thin.

First-call resolution

First-call resolution is the share of customers whose issue was solved in one call. It is the KPI closest to what customers care about and the hardest to measure, because a phone system cannot know whether a problem was solved.

Two practical proxies work well:

• Call categories. Agents pick a category after every call, such as “resolved”, “needs follow-up” or “escalated”. The share marked resolved is your working figure.
• Repeat callers. Check how many numbers called again within a few days about the same topic.

Neither is exact, but tracked consistently they show the trend.

Quick reference and review routine

KPI	What it tells you	What to do when it is off
Service level	Share of calls answered within the target time	Check it by hour, move staff to weak hours
Average wait	How long a typical caller waits	Compare with the longest wait, add agents at peaks
Abandon rate	How many callers gave up	See when they give up, shorten the menu, add a queue timeout
Average handle time	Capacity each call consumes	Coach outliers, fix slow processes, adjust wrap-up time
Missed calls	Calls that rang and were not answered	Check agent statuses, cover open hours, call back
Occupancy and break time	How loaded the team is	Stagger breaks, rebalance shifts
First-call resolution	Whether issues are solved the first time	Review follow-up categories, improve agent knowledge

Numbers only help if someone looks at them on a schedule:

• During the day: a live monitor shows who is on a call, how many callers are waiting and the longest wait. Alerts notify a supervisor when a threshold is crossed, for example more than five callers waiting.
• Every morning: yesterday’s service level, abandon rate and missed calls, by queue and by hour.
• Every week: per-agent handle time, break time and call categories, discussed with the team.

In QuipCalls these figures come from the built-in reports, which can be scheduled to arrive by e-mail as Excel files daily, weekly or monthly.

Frequently asked questions

What is a good service level for a call center?

A common target is answering 80% of calls within 20 seconds. Treat it as a starting point and adjust it to how urgent your calls are.

What is the difference between a missed call and an abandoned call?

An abandoned call ends because the caller hung up while waiting. A missed call rang an agent, or arrived outside working hours, and was not answered.

Should I try to lower average handle time?

Only once you know why it is high. Fix the cause, such as missing information or a slow process, and the number follows.

Summary

Service level, average wait and abandon rate describe what callers experienced. Handle time, occupancy and break time describe how the team’s time was used. First-call resolution, estimated through call categories and repeat calls, tells you whether the work solved the problem. Read the numbers by hour and by queue, and review them on a fixed routine.