Most practice owners know they miss calls. Almost none can say what those calls were worth, which is why the problem stays unsolved — it never gets compared against the cost of solving it.

The calculation is not complicated. It takes about ten minutes with numbers you already have, and the answer is usually larger than expected.

The basic arithmetic

Start with volume. A practice taking 40 calls a day across a 22-day month handles roughly 880 calls a month.

Industry answer rates for busy practices sit somewhere between 70% and 80% during opening hours, and effectively zero outside them. Take 75% as a working figure: that is 220 unanswered calls a month, before counting anything that arrives at night or over the weekend.

Now the part that matters. Not every missed call is lost revenue — many are existing patients who will call back. The question is what share were new enquiries, because those are the ones that do not call back.

The full calculation

Work through it with your own numbers:

1. Monthly call volume = daily calls × working days 2. Missed calls = monthly volume × (1 − your answer rate) 3. New-patient share = missed calls × the proportion that are new enquiries 4. Lost patients = new enquiries × your enquiry-to-patient conversion rate 5. Annual cost = lost patients × patient lifetime value × 12

The two numbers most practices have to estimate are steps 3 and 5. For step 3, a reasonable starting assumption in most practices is 20–30% of inbound calls being new enquiries, though it varies sharply by specialty. For step 5, use your own average — a dental practice, an aesthetic clinic and a law firm have wildly different answers.

Why the number surprises people

Two reasons.

Missed calls cluster at the worst times. They arrive at lunch, after close, and during the minutes your front desk is walking someone to a room. Those are exactly the hours when someone shopping around calls the next provider on their list.

New enquiries do not leave voicemail. An existing patient will leave a message and wait. Someone choosing a provider works down search results until one answers. That asymmetry means your missed calls are disproportionately the valuable ones — the opposite of the intuition that missed calls are mostly routine.

What the number is not

Worth being careful here, because this calculation is easy to inflate.

It is not true that every missed call would have converted. Some were wrong numbers, some were sales calls, some were patients who called back ten minutes later. A calculation that treats every unanswered ring as a lost patient produces a number nobody believes, including you.

The useful version is deliberately conservative: only new enquiries, only your real conversion rate, only your actual patient value. If that number is still uncomfortable, it is worth acting on.

What actually moves it

Three options, in rough order of cost:

Change when you answer. Staggered lunch cover and a dedicated phone shift help, but they cost staff time and do nothing for nights or weekends.

Add an answering service. Humans answer and take messages. Reliable, and genuinely appropriate at lower volumes — our comparison of AI against an answering service covers where each one wins.

Automate the phone tier. An AI receptionist answers every call, books into your calendar, and escalates what it should not handle. It does not replace a front desk; it removes the interruptions from one.

Which is right depends almost entirely on the number you just calculated. Under a certain volume, none of them pay back and the honest answer is to leave it alone.

The follow-up nobody does

Calculate the same figure for your after-hours calls specifically. Most practices have never looked at this, and it is usually where the largest share of the loss sits — because there is no partial coverage at 8pm, only zero.

If you run a dental practice, a medical office, or a law firm, the after-hours number is frequently the one that justifies doing something.

Related Reading

Worked out your number and want to know what to do about it? Book a free 30-minute demo — we will tell you honestly if the volume does not justify it.