How much revenue do missed calls really cost a service business?
A simple model you can run on your own numbers in five minutes — and why the answer is usually larger than owners expect.
Most owners guess they miss 'a few' calls a week. When we pull the actual carrier logs, the number is usually between a fifth and a third of all inbound calls once you count after-hours, busy signals and rings that timed out. Here is how to turn that into a dollar figure.
The formula
Missed calls per month × your close rate on answered calls × average job value = monthly revenue lost.
Three inputs, all of which you can get today. Missed calls come from your phone provider's call log. Close rate comes from your CRM or, failing that, an honest estimate from whoever books jobs. Average job value comes from your accounting software.
A worked example
| Input | Value |
|---|---|
| Total inbound calls per month | 420 |
| Unanswered calls | 97 (23%) |
| Close rate on answered calls | 34% |
| Average job value | $520 |
| Monthly revenue lost | 97 × 0.34 × $520 = $17,150 |
| Annual revenue lost | $205,800 |
Two hundred thousand dollars is not a rounding error, and it is being lost by a business that is otherwise operating well. Nothing is broken except that the phone rings when everyone is busy.
The multiplier nobody includes
That model counts one job. In reality a first-time HVAC customer often becomes a maintenance plan member, then a repeat repair customer, then eventually a system replacement worth several thousand dollars. If a customer is worth three times their first job over five years, the real number above is closer to $600,000.
You do not need to be precise here. You need to be roughly right about the scale, because the scale changes what you are willing to do about it.
Where the missed calls hide
- After hours — often the largest bucket, and the most urgent callers
- Lunch, when a single front-desk person steps away
- Peak season, when every line is genuinely busy
- During other calls, if you have no second line or overflow
- Weekends, which for emergency trades is prime time
How to measure yours this week
- Pull the last 90 days of call detail records from your phone provider
- Count calls under 15 seconds and those with no answer — that is your miss set
- Break it down by hour of day and day of week
- Divide booked jobs by answered calls to get a real close rate
- Run the formula, then run it again with your lifetime value multiplier
Whatever answering solution you consider, compare its annual cost against the number you just calculated. If coverage costs $6,000 a year and recovers even a fifth of $200,000, the decision stops being a debate about monthly fees.
Frequently asked questions
Do missed callers usually call back?+
A minority do. Most call the next business in the search results, especially when the problem is urgent, and the majority never leave a voicemail at all.
Is a 23% miss rate unusual?+
No, it is fairly typical for a busy service business with daytime-only staffing. Businesses with no after-hours coverage often sit higher than that.
What miss rate should I aim for?+
Under 5% is realistic with overflow and after-hours coverage in place. Zero is achievable on the answering side, though some callers will always hang up before anything can pick up.
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