What does a missed call cost? An honest worked example

Why you should not trust the "30 %" figures

Search for missed calls and you find impressive numbers: 30 per cent of all calls are lost, 62 per cent, sometimes 70. The problem: those figures mostly come from provider blogs citing each other — there is rarely a verifiable primary study, with a method and a sample, behind them. A number without a source is not a basis for an investment decision.

The data that is solid describes the problem only indirectly: 60 % of consumers say small companies are always or often hard to reach by phone (YouGov/Enreach, 2023, 2,099 respondents, representative). That shows how callers experience reachability — not how many calls you are losing.

The honest calculation: three numbers you already know

What follows is a method, not a statistic. You need:

1. Missed calls per month. Do not estimate — count. Your call list shows missed calls; voicemail messages with nothing usable in them count too.
2. The share that would have become a new job. How many of those missed callers were new customers with a concrete request? Regulars usually ring back — new customers are more likely to ring the next result in the list.
3. Your average job value. You know this one from the books.

The formula: missed calls × share of new jobs × job value = lost revenue per month.

A scenario for scale

A worked example, explicitly a scenario: a trade business misses 8 calls a month, so roughly two a week. One in four of them would have become a new job, and the average job is worth €900. That business is losing 8 × 0.25 × €900 = €1,800 of revenue a month — a multiple of what an AI phone assistant costs a month (prices in "What does an AI phone assistant cost?").

Run the scenario with your own numbers: a hair salon with €45 appointments produces a completely different answer from a tax firm with four-figure engagements. Which is exactly why no universal statistic is any use.

What counts as "missed"

The term is broader than it sounds:

• Not answered — the obvious case
• Reached voicemail, said nothing — a common case: many callers hang up without leaving a usable message
• Busy tone during a peak
• Called back too late — the prospect has already bought elsewhere

Only the first shows up cleanly in your call list. The other three are the dark figure — and they are the real argument for counting honestly for a week.

The ladder of countermeasures, honestly ordered

Not every missed call needs technology:

1. Callback discipline: every missed call is returned the same day. Costs nothing, but in practice it founders on the job site.
2. Publish your hours: fixed phone times on the website and the answering machine — helps regulars, saves no new customers.
3. An AI phone assistant picks up when you cannot: the request, the callback number captured digit by digit, an appointment, or a transfer in an emergency. From here the calculation above is the basis for deciding: if the solution costs less than the lost revenue, it pays for itself.

What providers charge is in "What does an AI phone assistant cost?" — and whether it pays at your call volume is in "From how many calls a day is an AI phone assistant worth it?".