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Estimates for planning only. Not financial, legal or staffing advice.
How to calculate the abandon rate
Abandon rate = abandoned calls ÷ calls offered × 100
Adjusted abandon rate = (abandoned − short abandons) ÷ (calls offered − short abandons) × 100
Calls offered are all calls that reached your queue, answered or not. Short abandons are calls that end within a few seconds, for example after a wrong number or when the greeting already answered the question. You can exclude them, so the adjusted rate shows the callers who gave up after waiting. Pick one threshold and keep it.
Example: 800 of 10,000 calls abandoned is an 8.0% abandon rate. Without 150 short abandons, the adjusted rate is 650 ÷ 9,850 = 6.6%.
What drives abandonment
- Long waits in peak intervals, when staffing does not match call volume. The Erlang C calculator shows the agents each interval needs.
- No estimated wait time or callback option, so callers do not know whether to hold.
- Long phone menus before the queue.
- Routine calls that wait in the same queue as complex ones.
Where an AI voice agent helps
An AI voice agent can answer routine calls as they arrive, complete them and pass the rest to your agents. Routine calls stop waiting in the queue, and the calls left for people can be answered sooner.
Frequently asked questions
What is an abandoned call in a call center?
An abandoned call is a call that reached the queue but ended before an agent answered, because the caller hung up. Calls that end in the phone menu before reaching the queue are usually not counted.
How do you calculate the call abandonment rate?
Divide abandoned calls by calls offered for the same period and multiply by 100. For example, 800 abandoned out of 10,000 offered is 8%.
What is a normal abandonment rate?
There is no single standard. It depends on the industry, on how long your callers are willing to wait and on whether you exclude short abandons. Track your own rate by interval and compare it with your service level: abandonment rises in the intervals where service level drops.
Should short abandons be excluded?
For staffing decisions it makes sense, because callers who hang up within a few seconds did not give up on waiting. Report which threshold you use, and keep it the same over time so the trend stays comparable.
What is the 80/20 rule in call centers?
It is a service level target: 80% of calls answered within 20 seconds. It describes speed of answer, not abandonment, so track both by interval.