Why we won't give you an average
Search for “cost of a missed call” and you will find precise percentages, repeated everywhere, that nobody can trace back to a source. We have chosen not to repeat them. Not because a missed call costs nothing, but because its cost depends entirely on you: a plumber who misses an emergency call-out on a Sunday evening and a practice that misses a request for a check-up appointment do not lose the same thing, and no average describes them both.
The good news is that you have the data. Your phone keeps a log of missed calls. Your calendar and your invoices tell you what a customer is worth. All that is missing is a method, and it fits in four lines.
The method, in four lines
The monthly cost of missed calls is:
- the number of missed calls per month (A),
- multiplied by the share of those callers who don't call back (B), because those who call back are not lost,
- multiplied by the share of calls that, if answered, would have led to a sale or an appointment (C), because not every call is a customer,
- multiplied by what a customer brings in (D), as margin rather than turnover if you can.
Monthly loss = A × B × C × D. And to take returning customers into account, replace D with the value of a customer over a year.
How to find each figure
A: your missed calls
For two weeks, count the missed calls every day on your mobile, your landline and, if you have one, your switchboard. Count separately those that come in outside your opening hours and those that come in while you are already on the phone: these two categories are dealt with differently. Multiply by two to get a month. If you have a cloud phone system, its statistics give you this figure directly.
B: those who don't call back
Go back over the list of missed numbers and see which ones called back within 48 hours. The rest did not call back. If you always call back yourself, note how many times you reach someone who has “already found someone”. That is your B. It varies a great deal depending on how urgent the need is: high for an emergency repair, lower for a non-urgent quote request.
C: the share who would have become customers
Out of ten calls you answer, how many become an appointment, a job or a sale? You know roughly; if not, count over the same two-week period. That is your conversion rate for an answered call.
D: what a customer is worth
Take your average spend per customer or, better still, your average margin per job, per consultation, per sale. If a customer comes back several times a year, multiply by that number: a new patient, a new garage customer or a new landlord whose property you manage is worth more than their first visit.
An example, with deliberately fictitious figures
To show the calculation, and only for that, let's take an imaginary tradesperson. He records 30 missed calls a month (A). When calling back, he finds that one caller in two has already found someone else (B = 0.5). One answered call in three leads to a job for him (C = 0.33). A job leaves him €120 of margin (D). His estimated monthly loss is 30 × 0.5 × 0.33 × 120, or about €600 of margin, not counting the customers who would have come back. Replace each value with your own: the result only makes sense with your figures. The calculator does this calculation for you, and sets it against the price of a plan.
The costs the calculation doesn't see
The calculation gives an order of magnitude. It leaves out real costs that are harder to put a figure on.
- Time spent calling back. Calling back twenty numbers a day, getting voicemail, playing phone tag with people who are at work: an hour a day, taken out of your working day or your evening.
- Your image. A customer who gets the answering machine three times draws conclusions about your reliability, and says so.
- Reviews. Online reviews complaining that a business is hard to reach are common, and they stay up for a long time.
- Existing customers. A loyal customer who can't reach you about a new need doesn't always call back; they try the business down the road.
- An overloaded team. When reception answers the phone while serving a customer in front of them, both are poorly served.
Reducing the loss: the options, from the simplest to the most complete
- The voicemail greeting. A message that offers an alternative, such as an SMS, a form or a callback slot, keeps some of the callers who would have hung up. Our examples by trade are made for this.
- An automatic SMS after a missed call. Some operators and phone systems send an SMS to callers whose call was missed. It costs little and opens a door.
- Conditional call forwarding. To a business partner, a colleague, an answering service: the unanswered call is picked up by someone. The how-to guide gives the codes.
- A human telephone answering service during your busy periods, with its limited hours and its per-call cost.
- The AI voice agent, which answers every time, at any hour, books the appointment and sends you the summary. Its cost is fixed and known in advance: you set it against the estimated loss, and you decide. The complete guide to AI receptionists explains how it works, and the pricing guide how to compare plans.
Whatever the option, do the count again a month later. If A has gone down, you have a measure of what you have gained.
