In short: There is no single figure for what missed calls cost, but you can work it out for your business in two weeks: missed calls × share of new enquiries × share you no longer win with a callback × close rate × average job value. In the worked example below, ten missed calls a week come to about €1,300 of revenue a month. An AI answering service picks up those calls, answers questions, books appointments and forwards urgent ones. With EchoCall that starts at €75 a month for 250 minutes of calls, with the phone number and telephony on top.
We revised this article in October 2026. The previous version quoted a share of unanswered calls and a rate of callers who never call back after reaching voicemail. We could not find a reliable source for either figure. Both are gone, along with a table built on them.
What a missed call costs: the formula
A missed call only costs money if there was a job behind it that you do not get without it. So the calculation has five parts:
missed calls × share of new enquiries × share you no longer win with a callback × close rate × average job value
- Missed calls: every call nobody answered, including the ones where voicemail picked up.
- Share of new enquiries: not every call is a job. Suppliers, existing customers with questions and sales calls do not belong in the calculation.
- Share you no longer win: you still reach some callers with a callback. Others have already called the next business.
- Close rate: how many of your new enquiries normally turn into a job?
- Job value: the average revenue per job, without repeat business.
Industry-wide averages for these values do not exist in a quality we would rely on. Your own figures are more accurate anyway.
How many calls do you miss? How to count
Most businesses underestimate their missed calls because they only see voicemail messages. So count for two weeks wherever every call is logged:
- The call log of your phone system or router. It also shows calls where nobody left a message.
- The call log of the business mobile. In small businesses a large part of the calls arrive here.
- Note the time. You will need the time windows later, not just the total.
- Trace unknown numbers. Call back a sample and note whether it was a new enquiry and whether the caller had already found someone else.
After two weeks you have the first two factors of the formula and a rough idea of the third. You know the close rate and job value from your accounts or CRM.
Worked example with stated assumptions
The following values are assumptions for a small business, not averages. Put in your own.
| Assumption | Value |
|---|---|
| missed calls per week | 10 |
| of which new enquiries | 50 %, so 5 |
| of which not won back with a callback | 50 %, so 2.5 |
| close rate on new enquiries | 30 % |
| average job value | €400 |
| result per week | 2.5 × 30 % × €400 = €300 |
| result per month (4.33 weeks) | about €1,300 |
| result per year | about €15,600 |
Halve every assumption if you want to be cautious. The remaining amount is still above the cost of an AI answering service. Repeat business, referrals and the working time spent on callbacks are not in the calculation.
Why a callback later is not the same
Many businesses say: we call back. True, but it takes time, and with enquiries time is decisive. A study published in Harvard Business Review analysed 1.25 million online enquiries at 42 US companies. Companies that tried to contact a prospect within an hour were nearly seven times as likely to reach a meaningful conversation with a decision maker as companies that tried even an hour later. Compared with a first attempt after 24 hours or more, they were more than 60 times as likely. [1]
The study is from 2011 and concerns web enquiries in the US, not phone calls in Europe. The direction is still clear: people who want something sorted now do not wait long. And a callback often needs several attempts, because now the caller is the one who is unavailable.
The typical gaps in availability
If you log your missed calls with the time, you usually find recurring windows rather than chance:
- The morning rush. People who decided something the evening before call first thing. That is exactly when the line is busy.
- The lunch break. Many businesses switch on voicemail at lunchtime. Many customers have time to call precisely then.
- After hours. The caller gets home from work and now deals with the boiler, the dentist or the car. The business is closed.
- The weekend. Customers have time, nobody is in.
- Holidays and sickness. If the one person who normally answers is away, availability is gone for weeks.
- The second call. While one call is in progress the phone rings again, and nobody is free.
None of these gaps can be closed economically with extra staff. Nobody hires a receptionist just for the lunch break and Saturdays. These windows are exactly what an AI answering service is for.
Voicemail, answering service or AI answering service?
There are three ways to take calls when nobody can pick up. They differ mainly in what has been done for the caller at the end.
| Criterion | Voicemail | Answering service (people) | AI answering service |
|---|---|---|---|
| answers the call | yes, many hang up | yes, during the booked hours | yes, including evenings and weekends |
| answers questions | no | as instructed, often "I'll pass it on" | yes, from your knowledge base |
| books appointments | no | only with access to your calendar | yes, directly in your calendar |
| forwards urgent calls | no | yes | yes, to a phone number by your rules |
| price example | €0 | ebuero entry plan: €59.90 a month plus €1.39 per call and per started minute [2] | EchoCall: €75 for 250 minutes, number and telephony extra [5] |
An answering service staffed by people has its place when calls need tact and judgement. Most calls in the gaps, though, are about opening hours, an appointment, a callback request or an urgent transfer.
A comparison in numbers, using a German answering service as the example: assume 40 calls of 2 minutes each land in the gaps per month. On ebuero's entry plan that is €59.90 plus 40 × €1.39 plus 80 × €1.39, about €227 excluding VAT in total. [2] With EchoCall the 250-minute plan for €75 is enough, plus the phone number and telephony. [5] A full-time employee on the phone costs considerably more: a call centre agent in Germany earns a median of €2,420 gross a month [3], and with roughly 21 percent employer social security contributions [4] that comes to about €2,930. In return, a person also handles things an agent cannot.
Setting it up without changing how you work
The biggest worry is usually: then nobody human will answer the phone any more. The opposite is true if you only use the agent where nobody answers today.
- Your number stays. Your team answers the phone as before.
- Forward on no answer. If a call is not picked up after a few seconds, your line forwards it to the agent's number. On a mobile you do this with a keypad code, on a phone system in its menu. The codes are in our article for tradespeople, linked below.
- Outside opening hours you forward permanently.
- Add your knowledge. The agent learns from your website and documents: PDF, TXT, Markdown, CSV or JSON, single pages with a re-read interval or the whole website. How to Build an AI Agent Without Code in 2026 shows it step by step.
If you want to hear the agent first, use the live demo. It builds an agent from your website in about 20 seconds that you can call in the browser, no signup needed.
What the AI answering service handles on the call
The difference from a phone menu ("press 1") is that the caller simply talks. The agent understands the request in natural speech and acts:
- Takes the request and passes it on. Name, callback number, reason and urgency. The result can reach your team as an email, a ticket in Zendesk or Freshdesk, a contact in HubSpot or Salesforce or a message in Slack or Microsoft Teams, instead of a voicemail someone has to listen to.
- Books appointments. The agent checks free slots in Google Calendar, Outlook, Calendly or Cal.com and books directly. For medical practices this is the main use.
- Answers questions. Opening hours, directions, services, prices from your list, anything in the knowledge base.
- Recognises urgency. A burst pipe, an accident, a server outage: following your rules the agent forwards to an emergency number instead of offering an appointment next week.
- Hands over to a person. If the caller wants a human, the agent transfers to a phone number or takes a callback request.
The agent introduces itself as an AI at the start. Article 50 of the EU AI Act has required that since 2 August 2026. [6] With EchoCall you write this notice into the agent's first message yourself. The editor shows an info box, and the help centre has example sentences.
What the agent should not do
An AI answering service does not replace your expertise. It should not make diagnoses, promise prices that are not on your list or settle complaints on its own. That is what the transfer is for. Set these limits explicitly in the agent's instructions and test them with a few difficult calls before you go live.
Data protection
A call contains personal data: name, number and often the request itself. You therefore need a data processing agreement with the provider and a notice in your privacy policy. EchoCall runs its platform on IONOS servers in Frankfurt and Karlsruhe. The data processing agreement and the list of sub-processors are on the GDPR page. [7] For particularly sensitive settings the EchoHub has a zero-PII mode.
What an AI answering service costs
With EchoCall the voice agent costs €75 a month for 250 minutes of calls, €150 for 500 minutes and €450 for 1,500 minutes, with no setup fee. That is €0.30 per minute. The phone number and telephony are not included in the plan price. [5]
In the worked example above, ten calls a week are lost, about 43 a month. At 2.5 minutes per call that is roughly 110 minutes, so the smallest plan is enough. Put the €75 next to the roughly €1,300 of revenue in the example. Even if the agent only saves part of those enquiries, the sum usually turns positive quickly. A fuller calculation is in Return on Investment (ROI) of AI Voice Agents in 2026.
Industries where missed calls are especially expensive
- Trades: the boss is on site, the phone is in the office. See Answering the Phone in the Trades 2026.
- Medical and dental practices: appointment booking blocks the front desk. See Automating Appointment Booking in Medical Practices 2026.
- Car dealerships and garages: service bookings and test drives with simple requests. See AI Voice Agent for Car Dealerships and Auto Workshops 2026.
- Tax advisers and law firms: clients call when everyone is in a meeting. See Tax Advisers 2026: Answering Service, Voicemail or AI on the Phone?.
- Estate agents: viewing requests come in evenings and at weekends. See Call Centre or AI for Real Estate Agents 2026.
Frequently asked questions
What does a missed call cost on average?
There is no reliable average, because job values and close rates differ widely between industries. Calculate with your own numbers: missed calls × share of new enquiries × share you do not win back × close rate × job value. In the example above, with ten missed calls a week, that is about €1,300 of revenue a month.
Do callers ring back after reaching voicemail?
Some do, many do not. We know of no reliable rate. Count it yourself: for two weeks, call back a sample of missed numbers and note who has already found someone else. A study on web enquiries published in Harvard Business Review shows how sharply the chances fall the longer a response takes.
Do I have to change my phone number?
No. You forward unanswered calls and calls outside opening hours to the agent's number. Your familiar number stays.
Will callers notice they are talking to an AI?
Yes, and they must. Since 2 August 2026, Article 50 of the AI Act requires that callers learn this at the latest at the start of the call. One sentence in the greeting is enough.
What does an AI answering service cost?
With EchoCall, €75 a month for 250 minutes of calls, with no setup fee. The phone number and telephony come on top. You can test it with 30 voice minutes and 30 chat conversations for 14 days, and the credit card is verified with €1.
How quickly is an AI answering service ready?
The live demo builds a first version from your website in about 20 seconds. For real use you should add knowledge, connect your calendar, set up the transfer and check with a few test calls that the answers are right.
Sources
- Oldroyd, McElheran, Elkington: The Short Life of Online Sales Leads, Harvard Business Review, March 2011: hbr.org
- ebuero AG, answering service price list, excluding VAT (in German): ebuero.de/preise
- brutto-netto-gehaltsrechner.de, call centre agent salary (median €2,420) (in German): brutto-netto-gehaltsrechner.de
- lohnklar.de, employer social security contributions 2026 (in German): lohnklar.de
- EchoCall pricing: echocall.de/en/pricing
- Regulation (EU) 2024/1689 (AI Act), Article 50: eur-lex.europa.eu
- EchoCall, GDPR, DPA and sub-processors: echocall.de/en/gdpr
All links were checked on 6 October 2026. Third-party prices can change.
