A missed call costs a contact center three things: the extra work when the caller tries again, the sale, booking or renewal you lose when they don’t, and the cost of a complaint when a simple question turns into a second or third contact. There is no single euro figure that holds for every business. You can calculate your own in four steps: count unanswered and abandoned calls, estimate how many callers come back, put a value on the ones who don’t, and add the handling cost of the repeat calls. The fix is to answer more calls, not to staff for the peak.

In short:

• A missed call is any call that does not reach an answer: unanswered, abandoned in the queue, or dropped in a phone menu or flow.
• Many callers try again. In a study of a Dutch municipal call center, an estimated 40 to 49% of callers who hung up in the queue called back, most of them the same day.
• The repeat calls cost handling time; the callers who never come back cost revenue or goodwill. Which one dominates depends on your business.
• An AI voice agent answers 24/7 without a queue, resolves routine calls and routes the rest with context, so fewer calls are missed in the first place.

The three costs of a missed call

1. Repeat calls. A caller who tries again costs a second call that would not have been needed. Repeat calls also fill the queue at the busiest moments, which causes more missed calls.
2. Lost outcomes. Some callers do not try again. They book elsewhere, cancel, or let a renewal lapse. For a sales or booking line this is usually the largest cost.
3. Escalation. A question that should have taken one call becomes a complaint, an email and a call back. Each extra contact raises your cost per contact.

How to calculate the cost of missed calls in four steps

Monthly cost of missed calls = (repeat calls × handling cost per call) + (callers lost × value of a lost outcome) + (complaints × cost per complaint)

1. Count missed calls. Add up three groups from your telephony and contact center reports: calls nobody answered (including outside opening hours), calls abandoned in the queue, and calls dropped in the phone menu or the voice flow.
2. Estimate how many callers come back. Match caller numbers: how many missed callers called again the same day or within a week? That is your callback share. The rest either gave up or found another channel.
3. Put a value on a lost outcome. The average value of what the call was about: a booking, an order, a renewal, or the cost of a customer leaving. Use your own figures.
4. Add the handling cost of repeat calls. Minutes per call times the fully loaded hourly cost of an agent. As a starting point for wages: Eurostat puts average hourly labour costs in 2025 at €34.9 in the EU and €47.9 in the Netherlands (Eurostat, 31 Mar 2026), and Destatis puts Germany at €45.00 (Destatis, 29 Apr 2026). Add your own overhead for systems, management and space.

An illustrative example. The assumptions are invented for the calculation; replace every one with your own data.

Assumption	Value
Inbound calls per month	20,000
Missed (unanswered, abandoned or dropped)	8%, so 1,600 calls
Callers who try again	45%, so 720 repeat calls
Handling time of a repeat call	6 minutes
Hourly cost of an agent	€47.90 (Eurostat 2025, Netherlands, before overhead)
Callers who never come back and are lost as a customer or sale	10% of the 880 who do not call back, so 88
Value of a lost outcome	€150

Repeat calls cost 720 × 0.1 hour × €47.90 = about €3,450 a month. Lost outcomes cost 88 × €150 = €13,200. In this example the callers you never hear from again cost almost four times as much as the extra work. For a utility or insurer, where customers have to call back, the balance can shift towards repeat handling and complaints. Complaints are left out of this example; add them if they follow your missed calls.

For the full business case of answering those calls with an AI voice agent, see how to calculate the ROI of an AI voice agent. What the agent itself costs is covered in what an AI voice agent costs.

What callers do after an unanswered call

Researchers from CWI and VU University Amsterdam studied 498,508 calls to the call center of the municipality of Rotterdam, recorded between April and September 2012. They estimated that 40 to 49% of callers who abandoned a call redialled, and that most callers who call back do so the same day, shortly after hanging up (Ding, Koole and van der Mei, European Journal of Operational Research, 2015). They also note that “an abandoned customer has higher urge to call back than an answered customer”.

Two things follow from that:

• Your missed calls are partly your own repeat traffic. Counting every call as new demand overstates how many people need you and understates how many you failed the first time.
• The other half is a blind spot. The study does not show what happened to callers who did not call back that day. Some called later, some used email, some went elsewhere. Your own CRM and order data are the only way to find out.

Where missed calls come from

Look at your own call logs per hour and per day of the week. The pattern is usually one of three:

• Peaks. Monday mornings, the first days after a mailing, invoice runs, storms or outages. The queue grows faster than the team can answer. How to absorb these without extra staff is covered in how to handle call spikes without hiring.
• Outside opening hours. Calls in the evening, at weekends and on public holidays reach a closed line or a voicemail.
• Long queues and menus. Callers who wait too long or get lost in a phone menu hang up. SQM Group calls a 5% abandonment rate the call center industry standard, with 5 to 10% sometimes acceptable, and reports an average time to abandon of 2 minutes and 36 seconds (SQM Group, 25 Jul 2023). Treat both as a reference point, not a target: SQM does not publish how they were measured.

How to stop missing calls without staffing for the peak

Hiring for the busiest hour means paying for idle capacity the rest of the week. The alternatives:

• Answer every call at once. An AI voice agent answers 24/7, without a queue, also outside opening hours. It verifies the caller, resolves routine requests such as status questions and simple changes, and routes the rest to the right team with the details already collected.
• Offer a callback instead of a wait. For calls that need a person, a callback request keeps the caller and spreads the work. See smart callback requests for high-volume service teams.
• Follow up on the calls you still miss. Carglass follows up missed calls with an automated SMS or WhatsApp message (Carglass story).
• Remove the reason for the call. If one letter or one product change drives a peak, fix the source. When an analysis of its calls showed that some customers had received the wrong letter, Unigarant split future communications into smaller batches (Unigarant story).

How to measure whether it works

Track the same numbers every week, before and after a change:

• Missed call rate: unanswered, abandoned and dropped calls as a share of all inbound calls.
• Repeat calls: callers who call again about the same question within a few days.
• Outcome per call: how many calls were completed by the voice agent, transferred to a person or dropped, per step of the flow. A drop in one step is a missed call too.
• Cost per resolved call: total cost divided by the calls that were actually resolved.

How to measure an AI voice agent explains these numbers and why a single containment rate hides where calls fail.

Frequently asked questions

What does a missed call cost? There is no single figure. A missed call costs the handling time of the repeat call, the value of the sale, booking or renewal lost when the caller does not come back, and the extra contacts when a simple question turns into a complaint. Calculate it with your own call volume, callback share, handling cost and order value.

How many callers call back after a missed call? It depends on the business. In a study of 498,508 calls to the municipality of Rotterdam’s call center, researchers estimated that 40 to 49% of callers who abandoned a call redialled, most of them the same day. Match caller numbers in your own data to find your share.

What is an acceptable call abandonment rate? SQM Group calls 5% the call center industry standard, with 5 to 10% sometimes acceptable. Use it as a reference, and compare your own rate per hour and per day: an average can hide a peak hour where a third of callers hang up.

How do I calculate the cost of missed calls? Multiply repeat calls by the handling cost per call, add the callers who never come back multiplied by the value of a lost outcome, and add the cost of resulting complaints. Use your own telephony reports for the counts and your fully loaded agent cost for handling.

How do I avoid missing calls outside office hours? Let an AI voice agent answer outside opening hours. It answers 24/7 with no queue, resolves routine requests and hands the rest to your team with the context, so the caller does not hit a closed line.

Stop losing calls you never see

Most organisations do not know how many calls they miss, or what happens to those callers. Start with your own call logs, then look at what answering every call would change. Contact our sales team and we will go through your call reasons and volumes with you.

← Back to blog