What a missed call costs, and how to work out your own number

A missed call from a new customer is a lead that will probably go to someone else. The cost is not the minute you lost. It is the job, visit, or appointment that follows, and often the years of repeat business after it.

This guide sets out what the research shows, which popular numbers to ignore, and a short formula you can use to put a dollar figure on your own missed calls.

What the research shows about speed

The most cited independent study on reply speed was published in Harvard Business Review in 2011. Researchers sent a test enquiry through the websites of 2,241 US companies and timed the replies. Only 37% replied within an hour. Almost a quarter (23%) never replied at all, and the average reply among those that did came after 42 hours.^[1]

The same authors then looked at 1.25 million real sales leads across 42 companies. Firms that tried to contact a new lead within an hour were nearly 7 times as likely to qualify that lead as firms that waited even one more hour. Compared with firms that waited a day or longer, they were more than 60 times as likely.^[1]

That study measured web enquiries, not phone calls. A phone call is the same moment in a faster form. The person is ready to talk now, and the window closes quickly.

The numbers we do not use

You will see claims online that "62% of calls to small businesses go unanswered" or that "85% of callers never call back." We traced the first to a 2016 study of 85 businesses run by a marketing company that sells call answering.^[2] We could not find a published method for the second. Figures for specific industries, such as the share of calls dental offices miss, mostly come from companies selling phone or AI answering products.^[3]

These numbers may be roughly right. They are not strong enough to plan around. Your own call log is better evidence than any of them, and it is free.

Work out your own cost in 4 numbers

Pull up your phone system's call history for the last 4 weeks. Most business phone apps and carriers show missed and unanswered calls. Then fill in these 4 numbers.

1. Missed calls a week. Count calls that rang out or went to voicemail during and after opening hours. Leave out calls you returned within 5 minutes.
2. Share from new customers. Check a sample of the numbers against your customer list. If 1 in 3 is not already a customer, use 33%.
3. Your booking rate. Out of new callers you do speak to, how many book? If you do not track it, take the last 20 new-customer calls and count.
4. Value of a first booking. Use the average first invoice, not lifetime value. This keeps the figure honest.

Weekly cost = missed calls × share new × booking rate × value of a first booking. Multiply by 52 for a year.

A worked example

These inputs are an illustration, not data from any real business. Say a plumbing company misses 15 calls a week. A third are new customers, so 5 calls. When the office does pick up, it books 40% of new callers. The average first job is $350.

5 new callers × 40% × $350 = $700 a week, or about $36,400 a year in first jobs alone.

Change any input and the figure moves a lot. Halve the missed calls and it halves. That sensitivity is the point. Most owners have never put a number on this, and the first time they do, it is rarely small.

Some of those callers will leave a voicemail or call back. If your log shows that happens often, lower the share of new callers to count only the ones who never reached you.

Four fixes, cheapest first

Text back every missed call. An automatic text within a minute ("Sorry we missed you, how can we help?") starts a conversation while the caller is still deciding. It costs a few cents a message on most business phone systems, and it gives your team a written thread to pick up when they are free. Here is how missed-call text-back works.

Route calls by the clock. Many missed calls happen because the phone rings at one desk while the person who could answer is elsewhere. Ring groups, opening-hours routing, and calls that ring on a mobile app close most of this gap without new staff.

Cover the closed hours. A full-time receptionist covers about 40 of the 168 hours in a week. Weekday evenings and weekends are when many people get around to booking. An answering service, or an AI that answers, asks the right questions, and books into your calendar, can cover the rest. We compare the costs in our receptionist cost guide.

Staff the peaks. If your log shows a cluster of missed calls at the same times each week, a part-time hire or a shift change for those hours may pay for itself. The US median wage for receptionists was $18.27 an hour in May 2025.^[4] Your 4-number formula tells you whether the calls in that window are worth more than that.

Measure the fix, not just the problem

Whatever you change, track the same 4 numbers for a month afterwards. You want fewer missed calls, a faster first reply, and more bookings from new callers. If your phone system and your customer records sit in separate tools, this is hard. That is one reason we put calls, texts, and bookings in one system for the businesses we set up, so the before and after show up in one set of reports.

Trades feel this most, because the caller with a leak rings the next number on the list. See how a home services business and a dental practice handle missed calls.

The short version

Reply speed matters, and the best independent evidence says the first hour counts most. Ignore round-number statistics with no method behind them. Use your own call log, the 4-number formula, and the cheapest fix first.

Want to see what your call log says? Book a walkthrough and we will go through it with you.