How to Calculate the Cost of Missed Calls
A simple, honest method for estimating what unanswered calls cost your business, with a worked example and the assumptions that matter.
A missed call feels like a small thing. One call, one voicemail, try again later. The trouble is that a person who needs a plumber, a table or an appointment rarely waits. They call the next business on the list.
Putting a number on this is useful, as long as you are honest about how rough the number is.
The formula
Missed calls × share who were potential customers × your usual conversion rate × value of a customer
Four inputs. Each needs a moment's thought.
1. Missed calls
Count them. Your phone system or carrier call log will show unanswered calls. Use a real two-week sample rather than a guess; most owners underestimate.
2. Share who were potential customers
Not every call is a sale. Remove:
- Sales calls and robocalls
- Wrong numbers
- Existing customers with a quick question
- Suppliers
If you have no data, look through a week of answered calls and note how many were new inquiries. That proportion is a reasonable stand-in.
3. Conversion rate
Of the new inquiries you do speak to, how many become customers? Use your own figure. If you do not know it, tracking it for a month is worthwhile for many reasons beyond this calculation.
4. Customer value
For one-time work, use the average job. For repeat business, use what a customer spends in a year. Be conservative.
A worked example
These numbers are made up for illustration. Substitute your own.
| Input | Example |
|---|---|
| Missed calls per week | 12 |
| Share who were potential customers | 50% |
| Conversion rate | 30% |
| Average customer value | $450 |
12 × 0.5 = 6 potential customers a week. 6 × 0.3 = 1.8 customers a week. 1.8 × $450 = $810 a week, or about $3,500 a month.
That is the estimated opportunity in this example. It is not a prediction, and it is not money you can bank.
Why the real figure is probably lower
Be sceptical of your own result. Several things pull it down:
Some callers ring back. Not everyone gives up. If half of yours try again later, halve the figure.
Some leave a message you return successfully.
You may be at capacity. If you are booked solid for three weeks, answering more calls produces a longer waiting list, not more revenue this month.
After-hours callers may convert differently from daytime ones, in either direction.
Why it might be higher
Repeat business. A customer you lose today is also the three jobs they would have given you over the next few years.
Referrals. Lost customers do not recommend you.
Reviews. "Never answers the phone" is a common theme in one-star reviews.
What to do with the number
The point is to decide whether the problem deserves attention.
- If the estimate is small, a better voicemail greeting and a habit of quick callbacks is probably enough.
- If it is a few hundred dollars a month, inexpensive fixes like ring groups and automatic missed-call texts will likely pay for themselves.
- If it runs to thousands, proper cover, whether a person, an answering service or an AI receptionist, is worth serious consideration.
How to reduce missed business calls walks through the options in order of cost.
Run your own numbers
The calculator below uses exactly this formula. Enter your own figures, then try a pessimistic version with every input lowered. If the answer still justifies acting, you have your decision.
