How much does a missed call cost a small business?

A missed sale shows up nowhere in your accounts. There’s no line item for it, no notification, no follow-up task. The caller rang, heard six rings and a voicemail greeting, hung up, and rang the next business on the list. From your side, nothing happened at all.

That invisibility is why phone cover gets underinvested in. So it’s worth doing the arithmetic explicitly, then checking it against what the evidence will actually support, which is less than the industry usually claims.

How do you calculate the cost of a missed call?

You need three numbers, and you already have two of them.

1. Missed inbound calls per week. Your phone system, mobile call log, or VoIP dashboard can tell you this. If you really can’t get it, count the voicemails you receive in a week and treat that as a floor rather than a total.
2. Your close rate on answered calls. What proportion of people who get through to you become customers? For a trade or a clinic this is often high, because someone who picks up the phone has already decided they want the thing.
3. Your average job value. Not your best job, your median one.

Multiply them:

missed calls/week × close rate × average job value × 52

A worked example

A two-van plumbing firm misses 12 calls a week, mostly during jobs, when both engineers are under a sink and nobody’s in the office. They convert about 40% of the calls they do answer, and an average job is £180.

12 × 0.40 × £180 × 52 = £44,928

Nearly forty-five thousand pounds of annual revenue that never entered the pipeline. Not lost in a competitive pitch, just to a ringing phone.

The instinct is to distrust this number, and there is one real objection: some of those callers ring back. Fair enough. Halve it. It’s still over twenty thousand pounds, and it’s still money leaving through a door nobody is watching.

Do missed callers ring back?

Less often than the objection assumes, and the evidence points in two unhelpful directions at once.

On the caller’s side, BT’s research into UK businesses found that customers will try a company a maximum of twice before taking their business elsewhere, and around a fifth said they would call just once. That study is from 2014 and covers firms of 20–249 employees rather than one-van operations, so treat it as indicative, though nothing published since suggests buyers have become more patient.

On your side, the callback is weaker than it feels. Hiya’s 2024 analysis of 221 billion calls found that 46% of calls from unidentified numbers go unanswered even when a legitimate business is placing them, and that 60% of consumers never return a missed call from a number they don’t recognise. When you ring back two hours later from a mobile the caller has never seen, that’s exactly the call you’re making.

So the honest position sits between “they’ll ring back” and “they never ring back”: the callback is a second-best attempt at a moment that has already passed, and you should not model it as recovering most of the loss.

What the widely quoted missed-call statistics actually say

If you research this topic you will meet the same four numbers on dozens of sites, each citing the last. We went looking for the primary sources. Here is what survived.

We’ve dropped the middle two from our own writing, including from earlier versions of these posts. They are repeated everywhere and sourced nowhere, and a number you can’t attribute is worth less than an argument you can.

Which leaves the case resting on something sturdier anyway: your own arithmetic. You do not need a disputed industry average to know what a missed call costs you; your call log and your invoices will do.

Why the usual fixes don’t hold

Voicemail. Set the disputed percentages aside and the structural problem remains: voicemail converts a live buying signal into a dead one. It asks a person who wanted an answer now to perform an extra task, wait an unknown length of time, and then answer an unrecognised number later. Every step of that is a place to lose them.

Call diversion to a mobile. This moves the problem rather than solving it. You’re now taking calls with your hands full, which is worse for the caller and worse for the job you’re actually doing.

A call answering service. These work, and for some businesses they’re the right answer. But a human service that doesn’t know your prices, your availability, or your diary can mostly take a message, which is a slower voicemail with a friendlier voice. The good ones cost £300–800 a month and still hand you a callback list at the end of the day.

To compare providers against your own call volume, our guide to telephone answering service costs in the UK sets out published prices, included hours and a worked example for 100 calls a month.

What “answered” needs to mean

Answering the phone isn’t the goal; resolving the call is.

The difference between a message taken and a job booked is whether whoever picked up could do three things: know what you charge, see when you’re free, and put the appointment in the diary. If they can’t, the caller is still waiting on you; they’ve just been told they’ll hear back.

That’s the bar worth measuring any solution against, including an AI receptionist: not “did someone pick up” but “did the caller get what they rang for”. It’s also the bar that makes the phone worth defending at all: YouGov found in 2025 that 31% of Britons still prefer to contact a company by phone and 65% do it, against 1% who prefer a chatbot. The channel your customers actually choose is the one ringing out.

Run your own number

Take your three figures and do the multiplication before you evaluate anything. If the answer is a few hundred pounds a year, stop reading about this and go do something more valuable with your afternoon. If it’s five figures, you have a problem that’s worth about an hour of your attention, and it is almost certainly the cheapest revenue you will find this quarter, because you don’t have to win it. You already did. You just weren’t there to take the call.

If the number is large and you want to see what answering it properly looks like, we’ve written up how this plays out for trades and home services and for estate agents, and our pricing is public so you can put it straight into the comparison above.