The cost of a missed call is not one number, it is a calculation from five inputs you already have: calls per month, the share you miss, the share that is new business, your average ticket and your close rate. Run those five through the formula below and you get a figure you can defend.
How do you calculate the cost of a missed call?
One line does the whole job.
Monthly missed-call cost =
calls per month
x missed share
x new-business share
x average ticket value
x close rate on answered callsTwo notes before you use it. First, the answer is an upper bound, because some missed callers leave a voicemail and some call back. Discount it by your own recovery rate once you have measured one. Second, average ticket is doing most of the work in this equation. A business with a $2,500 average matter loses roughly five times as much per missed call as one with a $450 average job, even if both answer the phone equally badly.
What numbers do you already have?
You can fill this in today. Nothing here needs new software.
| Input | Where to find it | Common mistake |
|---|---|---|
| Calls per month | Phone system reports in RingCentral, Dialpad, Aircall or Zoom Phone | Counting internal and outbound calls in the total |
| Missed share | Same report: abandoned, unanswered and after-hours calls | Ignoring calls that reached voicemail during open hours |
| New-business share | Tag one week of calls, or use CRM lead source | Assuming every unknown number is a new customer |
| Average ticket | Accounting or CRM report for the last 90 days | Using the biggest job instead of the average one |
| Close rate | Booked work divided by qualified inbound calls | Using overall close rate including referrals and repeat clients |
If you only have guesses, use the guesses to get a first answer, then measure properly for 30 days and rerun it. The second answer is the one to take to a decision.
What does the math look like by industry?
Every row below is an illustrative example, not industry research. The inputs are placeholders chosen to show how the formula behaves in different shapes of business. Replace them with your own numbers before you draw any conclusion.
| Illustrative example | Calls a month | Missed share | New business share | Average ticket | Close rate | Monthly cost |
|---|---|---|---|---|---|---|
| Dental practice | 600 | 18% | 20% | $700 | 45% | about $6,800 |
| Medical clinic | 1,200 | 20% | 12% | $900 | 50% | about $12,960 |
| Law firm | 300 | 22% | 25% | $2,500 | 20% | about $8,250 |
| HVAC or plumbing | 900 | 25% | 30% | $450 | 50% | about $15,190 |
| Real estate team | 400 | 20% | 35% | $8,000 | 8% | about $17,920 |
| Salon or spa | 800 | 15% | 25% | $600 | 40% | about $7,200 |
| IT services or MSP | 250 | 15% | 15% | $9,000 | 15% | about $7,590 |
| Insurance agency | 350 | 18% | 22% | $400 | 25% | about $1,390 |
| E-commerce brand | 500 | 30% | 10% | $120 | 35% | about $630 |
Three patterns show up whenever owners run their own figures.
Volume is not the driver. The illustrative e-commerce row misses the largest share of calls of any line in the table and loses the least money, because the average order is small and most callers email instead. The illustrative real estate row misses fewer calls and loses the most, because one missed call can be one lost commission.
Close rate and average ticket move the answer by exactly the same amount. Halving the close rate halves the answer. Halving the average ticket halves it too. If you want a quick sensitivity check, change one input at a time and watch which one moves the number most for your business. That tells you whether to fix the phone or fix the pipeline.
New-business share is the input people get most wrong. Owners tend to assume half their calls are new customers. When practices actually tag a week of calls, existing-customer questions, suppliers and no-shows usually dominate. Tagging is free and it cuts the estimate down to something believable.
Two ways to sanity-check whatever number you land on. First, annualize it. A monthly figure of $6,800 is $81,600 a year, which is either obviously worth fixing or obviously an overestimate, and both answers are useful. Second, discount it by your recovery rate. If a third of missed callers leave a voicemail and you book half of those, your real loss is closer to 83 percent of the headline figure, not 100 percent. Measure that recovery rate for one month rather than assuming it, because it varies enormously by how urgent the caller’s problem is.
Then stress-test the inputs. Rerun the formula with your missed share halved, then with your average ticket halved, then with your close rate halved. Whichever change moves the answer most is the lever worth pulling first, and it is often not the phone.
What does it cost to stop missing calls?
Now put a real number on the other side of the ledger. These are published figures, not estimates.
| Option | Published cost | Source |
|---|---|---|
| In-house receptionist | Median wage $38,010 a year before benefits, about $3,170 a month, based on May 2025 data | BLS Occupational Outlook Handbook |
| Human answering plans | About $235 a month for 50 minutes up to $1,095 for 500 minutes, overage $2.95 to $4.70 a minute | OnceHub, September 2026 |
| Ruby | From about $235 for 50 minutes to $1,095 for 500 minutes, $4.70 a minute over | Ruby pricing |
| Smith.ai | Live plans from about $292 for 30 calls, $9.75 per call over | Smith.ai pricing |
| AnswerConnect | About $325 for 100 minutes, $2.95 a minute over | AnswerConnect plans |
| AI receptionist | $25 to $300 a month flat | OnceHub, September 2026 |
Put the two halves together and the decision usually makes itself. In the illustrative HVAC example, the loss is several times the cost of any coverage option in the table. In the illustrative e-commerce example, the loss is smaller than the cheapest human plan, which means the right answer there is better email and chat coverage, not a receptionist.
Watch the per-minute trap at the top end. A plan that looks cheap at 100 minutes gets expensive fast: 400 minutes of overage at $2.95 adds $1,180 to a $325 base, and at $4.70 it adds $1,880. Once your talk time is consistently above roughly 400 to 500 minutes a month, a dedicated person at a flat rate is usually the cheaper unit.
AssistBPO staffs dedicated, employed receptionists who answer in your name and also handle the admin between calls; see the front desk and phones desk. Plans depend on hours, desks and coverage. Get a staffing plan within 1 business day.
Which calls are actually worth catching?
Not all of them, and pretending otherwise leads to overspending. Sort your inbound traffic into four buckets and cover them differently.
| Bucket | Example | Worth a live answer? | Cheapest fix |
|---|---|---|---|
| New business, time-sensitive | Burst pipe, toothache, accident inquiry | Always, including nights | After-hours human answering |
| New business, patient | Quote request, consultation booking | Yes, within business hours | Overflow ring group, lunch cover |
| Existing customer, transactional | Reschedule, order status, invoice copy | Sometimes | Self-service plus callback rule |
| Not business | Sales calls, robocalls, wrong numbers | No | Screening and blocking |
Most front desks are drowning in bucket three and losing money in bucket one. Measuring the split for two weeks usually reveals that the answer is coverage at specific hours, not more staff all day.
How do you cut your missed-call rate this month?
Work down this list in order. The first four cost almost nothing.
- Pull the hourly report. Find the two hours a day and the two days a week where calls go unanswered. Most gaps cluster at opening, lunch and the first hour after closing.
- Add a second ring group. Route overflow to another person or device after three rings instead of straight to voicemail.
- Cover lunch deliberately. Rotate cover rather than leaving the desk empty at the busiest hour for booking calls.
- Set a callback rule. Every voicemail returned within 30 minutes during open hours, logged with the outcome. Measure how many convert; that is your recovery rate.
- Script the first 20 seconds. Greeting, name, reason for the call, then the booking question. A consistent open shortens calls and raises booking rates.
- Cover after hours for bucket one only. Emergency and new-business calls get a person; everything else takes a message.
- Book the appointment on the call. Transfers to voicemail for scheduling are where most booked work leaks out.
- Rerun the math in 30 days. Same five inputs, new phone report. If the missed share has not moved, the problem is coverage hours, not effort.
The short version: calculate the cost of a missed call from your own five numbers, treat every published industry figure with suspicion, then compare your answer against the real, sourced cost of covering the phone. In most businesses the gap is large enough that the decision takes about ten minutes once the numbers are on one page.
Frequently asked questions
How much does a missed call actually cost?
It depends entirely on your average ticket and close rate, which is why a single industry number is meaningless. Multiply calls per month by the share you miss, by the share of calls that are new business, by your average ticket, by your close rate on answered calls. A trades business with $450 jobs and a law firm with $2,500 matters can miss the same number of calls and lose very different amounts.
Where do I find the five numbers I need?
Calls per month and missed share come from your phone system reports: RingCentral, Dialpad, Aircall, Zoom Phone and most VoIP providers all show answered, abandoned and after-hours calls. New-business share comes from tagging a week of calls or from your CRM lead source. Average ticket and close rate come from your accounting or CRM reports. If you only have estimates, use them, then measure properly for one month and rerun the math.
Do voicemail and callbacks recover the value?
Partly, and less than most owners assume. Recovery depends on whether the caller has an alternative. A caller with a burst pipe or a toothache rings the next listing. A caller renewing a policy will usually wait. Measure it rather than guess: tag one month of voicemails and count how many turned into booked work. Use that recovery rate to discount your missed-call cost instead of assuming the whole amount is lost.
Is an answering service cheaper than a receptionist?
It depends on volume. The BLS Occupational Outlook Handbook gives a median US receptionist wage of $38,010 a year before benefits, based on May 2025 data, which is about $3,170 a month. OnceHub's September 2026 roundup puts human answering plans at roughly $235 a month for 50 minutes up to $1,095 for 500 minutes, with overage of $2.95 to $4.70 a minute. Per-minute plans win at low volume and lose badly at high volume.
What is a reasonable missed-call rate to aim for?
Pick a target you can measure rather than an industry benchmark you cannot verify. Most front desks can reach 95 percent of calls answered by a person within 20 seconds during covered hours. The bigger win is usually coverage rather than speed: lunch hours, evenings, weekends and peak mornings are where unanswered calls cluster. Measure by hour of day for two weeks and the gaps will be obvious.
