Abandonment rate is the share of contacts, usually calls or chats, where the customer disconnects before reaching an agent. It's calculated as abandoned contacts divided by total contacts offered.‍

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Why it matters

A high abandonment rate almost always points to a wait time problem rather than a quality problem, since customers are leaving the queue, not a conversation. Every abandoned contact is a customer who needed help and didn't get it, and some call back more frustrated or don't come back at all.

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‍How it connects to staffing

Abandonment rate ties directly to workforce management, since the Erlang C formula used to calculate staffing needs assumes customers never abandon the queue, which means it tends to overstate the agents actually required once real-world abandonment is factored in. Teams usually track it alongside average wait time, since the two move together closely.

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‍Why some abandonment isn't a problem

Not every abandoned contact represents a failure. Some customers hang up because they solved the problem themselves while waiting, found the answer on the website, or realized they called the wrong department. A rising abandonment rate combined with a rising average wait time is the real warning sign, not the raw number alone.