Search this question and you will find a dozen confident dollar figures. Ignore all of them, including any we might be tempted to give you.
Those numbers come from someone else's fee schedule, someone else's case mix, someone else's market, and frequently from a vendor with an interest in the number being large. Your practice's figure is knowable and it is specific to you, and getting it takes about twenty minutes with two reports you already have.
Here is the arithmetic.
Step 1: Count the calls you actually miss
Pull an inbound call report from your phone system for a full, normal month. Avoid a month with a holiday closure or a vacation, because you want a representative baseline.
You are extracting four numbers:
- Total inbound calls
- Calls answered by a person
- Calls that went to voicemail
- Calls abandoned before anyone picked up
That last one is the one people forget and it is often the largest. A caller who hangs up after six rings never appears in a voicemail count, but they are gone all the same.
Add voicemail and abandoned together. That is your missed call count.
Most VoIP and cloud phone systems produce this natively. If yours cannot, your phone vendor can pull it. If you genuinely cannot get the data, that is worth solving first, because you cannot manage this without it.
While you have the report open, note when the missed calls happen. Cluster them by hour and by day of week. Almost every practice finds them concentrated in three windows: the lunch hour, the hour after close, and Monday morning. That distribution tells you what kind of problem you have.
Step 2: Work out how many were new patients
Not every missed call is a lost patient. Most are existing patients who will call back, or vendors, or wrong numbers, or spam. The ones that matter are the new patients a busy front desk never reaches.
Two ways to estimate the new patient share.
The better way: sample your answered calls. Take one week of answered calls and count how many were genuinely new patient inquiries. That gives you a real ratio for your practice. Apply the same ratio to your missed calls.
The faster way: your practice management system knows how many new patients you added last month, and your call report knows how many calls you answered. That gives you a rough conversion rate you can apply.
Neither is exact. Both are enormously better than a number from the internet.
Be conservative here. If you are unsure whether the new patient share of missed calls is the same as the share of answered calls, assume it is lower. An estimate that survives your own skepticism is one you can actually act on.
Step 3: Find your real new patient value
This is where practice-specific reality matters most, and where published figures are least useful.
There are two versions of this number and you should know both.
First visit value. What a new patient produces at their initial exam appointment. Your practice management system can report production per new patient visit. This is the conservative figure.
First year value. What a new patient produces over their first twelve months, including whatever treatment came out of the initial exam. This is the more accurate figure for the actual value of acquiring a patient, and it is substantially higher than the first visit in most practices, because the exam is where treatment gets diagnosed.
Some owners go further and calculate lifetime value across the full retention period. That is legitimate but it invites optimism, and optimism is exactly what you do not want when you are about to make a spending decision. First year value is the number we would use.
Pull it from your own reports. Do not estimate it.
Step 4: Apply a conversion rate
A new patient who reaches your voicemail is not automatically lost. Some call back. Some you reach on a callback the next morning.
So the calculation needs a recapture rate. What share of missed new patient calls do you actually convert into booked patients through callbacks?
Your front desk can tell you roughly, and your callback log if you keep one can tell you exactly. If neither exists, note that as a gap and use a deliberately conservative estimate, meaning assume you recapture more than you probably do.
The lost patients are the ones you do not recapture.
The calculation
Putting it together:
Missed calls per month
× new patient share of those calls
× the share you do not recapture
× first year value per new patient
= monthly revenue not captured
A worked example, using placeholder numbers. These are round figures chosen to show the arithmetic, not claims about any real practice, including ours. Substitute yours.
Say a practice misses 100 calls in a month. Say 20 percent are genuine new patient inquiries, so 20 calls. Say they recapture half through callbacks, leaving 10 lost. Say their first year value per new patient is $1,000.
10 × $1,000 = $10,000 per month.
Change any input and the answer moves a lot. If the new patient share is 10 percent rather than 20, the figure halves. If first year value is $2,500 rather than $1,000, it more than doubles. That sensitivity is the entire point: this is not a number to look up, it is a number to calculate, because the inputs vary enormously between practices.
Step 5: Compare against the cost of fixing it
Now you have something to weigh a decision against.
Whatever you are considering, another front desk hire, an answering service, an AI receptionist, or restructuring your phone coverage, the comparison is that solution's monthly cost against the monthly figure you just calculated, adjusted for how much of the gap it would realistically close.
Adjust honestly. Nothing closes it entirely. A solution that covers after hours does not help with the lunch hour. A solution that answers but does not book converts a missed call into a callback, which recovers some of the value and not all of it. Ask any vendor which portion of your specific distribution they address, and be skeptical of an answer of "all of it."
What the timing pattern tells you
Go back to when your missed calls cluster, because the remedy follows directly from it.
Concentrated after hours and on weekends. A staffing problem you cannot hire your way out of at reasonable cost. This is what after-hours coverage exists for, and it is where the highest intent calls frequently sit, because someone with a toothache at 8pm is not shopping casually.
Concentrated during the lunch hour. A scheduling and coverage gap. Sometimes solved by staggering breaks, which costs nothing. Try that before you buy anything.
Spread evenly through business hours. A capacity problem. Your front desk is genuinely overwhelmed, or your phone tree is routing badly, or both. More coverage will help, but so might fixing the routing.
Concentrated on Monday morning. The weekend backlog arriving at once. This is a after-hours problem wearing a Monday disguise, because those callers tried to reach you on Saturday.
The number to write down
At the end of this, write down two figures and the date:
- Missed calls per month
- Estimated monthly revenue not captured
Then recalculate in ninety days, especially if you changed something. This is the metric that tells you whether the change worked, and it is far more reliable than a feeling that the phones seem better.
If a vendor cannot show you movement in the first number, they have not solved your problem regardless of what their dashboard says.
Telvana answers dental calls around the clock and books the appointment rather than taking a message. Bring your missed call count and we will talk about which part of it we can actually close.
