What a missed call actually costs 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.

The three numbers you need

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

1. Missed inbound calls per week. Your phone system or mobile can tell you this. If you genuinely can’t get it, count the voicemails you get in a week and multiply by three — most people who reach voicemail don’t leave one.
2. Your conversion rate on answered calls. What proportion of people who get through to you become customers? For a trade or a clinic this is often 30–50%, 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 × conversion 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 — lost to a ringing phone.

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

Why the usual fixes don’t hold

Voicemail. The oft-cited figure is that around 80% of callers won’t leave one. Whatever the exact number, the direction is not in dispute: voicemail converts a live buying signal into a dead one.

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.

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 ours. Not “did someone pick up,” but “did the caller get what they rang for.”

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.