How Much Revenue Do Missed Calls Cost a Small Business? The Math, by Industry
The formula for missed-call revenue loss, worked through for HVAC, plumbing, dental, chiropractic, med spa, auto repair, law, and medical practices — with the benchmarks stated so you can swap in your own numbers.
Missed-call revenue loss = calls per month × share unanswered × close rate on an answered call × average ticket. At 200 inbound calls a month and the industry benchmarks used in BizRep's calculator, the monthly leak runs from roughly $4,700 for a chiropractic practice to about $27,000 for a law firm, with HVAC and plumbing both above $11,000. Those are modeled figures with every input stated — change any of them and the answer changes with it.
The formula
That is the entire model. It is deliberately simple, because a simple model with stated inputs is more useful than a sophisticated one you cannot check. Four numbers, each of which you can find or estimate for your own business:
- Inbound calls per month. Your phone system or carrier reports this. Most owners have never looked, and it is usually higher than they guess.
- Share unanswered. The same report, or a benchmark for your trade. Across BizRep's site the general figure is 62% of small-business calls unanswered; per-industry rates are lower and listed below.
- Close rate on an answered call. Of the callers you do reach, how many book? Be honest — the model rewards honesty.
- Average ticket. Your typical job, visit, or matter value. Use the median if a few large jobs skew the mean.
Worked through, by industry
The table uses 200 inbound calls a month for every trade so the columns are comparable, and the per-industry benchmarks that power the missed-call calculator on this site. Your call volume is the input most likely to differ; the calculator lets you change all four.
| Industry | Avg ticket | Missed | Close rate | Monthly loss (200 calls) | Annual loss |
|---|---|---|---|---|---|
| HVAC | $450 | 38% | 35% | $11,970 | $143,640 |
| Plumbing | $380 | 42% | 38% | $12,130 | $145,555 |
| Dental | $280 | 30% | 45% | $7,560 | $90,720 |
| Chiropractic | $175 | 32% | 42% | $4,704 | $56,448 |
| Med spa | $420 | 28% | 50% | $11,760 | $141,120 |
| Auto repair | $290 | 35% | 36% | $7,308 | $87,696 |
| Law firm | $1800 | 25% | 30% | $27,000 | $324,000 |
| Medical practice | $220 | 33% | 40% | $5,808 | $69,696 |
Read the last two columns as what is leaking, not what a tool will recover. Some of those callers were price-shopping. Some already booked elsewhere. Some would not have converted anyway. The ROI calculator applies a recovery share to this leak — we default to a third — before it subtracts a plan price, and that is the number to use for a purchase decision.
Why the after-hours calls are worth more than average
The table treats every call the same, and that flatters the businesses that miss the most valuable ones. For HVAC and plumbing, the highest-ticket calls are emergencies, and emergencies arrive at night and on weekends — the plumbing pages on this site use the figure that about 70% of plumbing emergencies happen after hours. For chiropractic and med spa, the pages use 45% of inquiries arriving outside business hours; for dental, 40%. Those are exactly the calls that hit voicemail, and they are worth more than the daytime average.
So if your miss rate is concentrated after hours — and for an owner-operated service business it almost always is — the real leak is higher than a flat average-ticket model shows.
Industry notes
HVAC and plumbing
The two trades with the highest miss rates in the benchmark table, and the two where volume arrives in surges — the first heat wave, the first hard freeze, the storm week. A two-person office cannot answer six lines at once, so the miss rate during a surge is far higher than the annual average, and the surge is where the year is made. The HVAC page on this site works a published example: 20 missed calls a week at a 40% close and a $450 ticket is over $7,000 a week.
Dental, chiropractic, and medical practices
Lower tickets per visit, but a missed new-patient call is not one visit — the chiropractic page uses 12–20 visits a year per patient, and the dental page puts new-patient lifetime value in the thousands. The per-visit table understates these trades badly. The front-desk problem is structural: the busiest windows for inbound calls are the lunch hour and Monday morning, which are the busiest windows at the desk too.
Med spa
The lowest benchmark miss rate in the table, and the highest close rate — this is a premium, comparison-shopping buyer who has usually decided before calling. Which is why the miss hurts: the client who reaches voicemail reads it as a budget operation and books the next spa on her list.
Auto repair
Most missed calls here are quote requests treated as interruptions by a busy counter. The published auto-shop figure on this site is that 55% of calls are quote requests for standard services; each is a $200–$400 ticket that goes to the shop down the street when it rings out.
Law firms
The lowest miss rate and the highest ticket. The math is dominated by the matter value — at $1,800 a missed consultation is expensive even when it is rare — and by intake speed: a prospective client who leaves a voicemail at a law firm has usually called two others.
How to reduce missed-call revenue loss
There are only three levers in the formula you can pull quickly. Ticket and close rate are the business; they move slowly. The unanswered share is the one that can go to near zero in 48 hours.
- Measure it first. Pull the carrier report. You cannot fix a leak you have not sized.
- Stop relying on voicemail. Most callers who reach it hang up. A voicemail greeting is not an answer.
- Answer every call at once, including at night. That is not a staffing problem you can hire your way out of; it is what an AI receptionist does. It answers on the first ring, 24/7, books the routine calls, and routes the emergencies — for less than one recovered job in most trades.
- Cover the website too. Most customers search before they call; the visitor reading your page at 11 PM is a call you have not missed yet.
You can size your own leak in about two minutes. Enter your website URL and our system estimates it from your business — your review count, your trade's benchmarks — and builds a working AI receptionist on your actual site so you can hear what answering would sound like.
The bottom line
The cost of missed calls is not a mystery and it is not a marketing number. It is four inputs multiplied together, and every one of them is knowable for your business. Run the formula with your numbers. If the monthly leak is larger than the price of answering the phone — and in every trade above, at 200 calls a month, it is by a wide margin — the decision is arithmetic.
Questions people also ask
How do you calculate the cost of missed calls?
Monthly missed-call revenue loss = inbound calls per month × share unanswered × close rate on an answered call × average ticket. Multiply by 12 for the annual figure. Every input is something you can measure or estimate for your own business.
How many calls does a small business miss?
The benchmark used across BizRep's site is that 62% of small-business calls go unanswered, and 80% of callers who reach voicemail hang up without leaving a message. Per-industry miss rates in the site calculator range from 25% (law firms) to 42% (plumbing).
What is the cost of missed patient calls for a medical or dental practice?
Using the calculator benchmarks — 200 calls a month, a 33% miss rate, a 40% booking rate, and a $220 visit — a medical practice leaks about $5,800 a month. A dental practice at a 30% miss rate, 45% booking, and $280 first visit leaks about $7,600. New-patient lifetime value makes the true figure higher.
Which industry loses the most to missed calls?
Per call, law firms — a $1,800 average matter means a single missed consultation call is expensive even at a 25% miss rate. Per month at equal call volume, HVAC and plumbing lead because they combine high tickets with the highest miss rates, and their most valuable calls arrive after hours.
What is the fastest way to reduce missed-call revenue loss?
Answer the calls. Staff cannot answer six lines at once and cannot answer at 2 AM; an AI receptionist answers every call simultaneously, 24/7, books the routine ones, and routes the emergencies. It costs less than one recovered job in most trades.
Hear an AI receptionist on your own website
Enter your URL. Our system builds a working agent on your actual site in about two minutes and estimates what missed calls are costing you. No calendar, no sales call.
Run my free scanEnter your URL. About two minutes later you have a leak estimate and a working agent trained on your own site. No calendar, no sales call.