How does this missed call cost calculator work?

It turns a missed call into a dollar figure using four numbers you already know. You enter how many calls you miss in a typical day, the share of answered calls that become paying customers, the average value of a customer, and how many business days you run each month. The tool multiplies missed calls per day by business days to get monthly missed calls, applies your close rate to estimate how many of those would have booked, and multiplies by average deal value for the revenue you never see. It then shows the same figure across a full year, because the leak compounds. Every field has a sensible default so you get a real answer in seconds, then you tune it to your own numbers for a figure you can trust. Nothing is stored and nothing is emailed, the result lives in the shareable link so you can send it to a partner and they see the same math.

Why do missed calls cost so much more than they feel like they do?

Because a missed call is not a lost call, it is a lost customer, and a customer is worth far more than one transaction. When someone calls a business and no one answers, most of them do not leave a voicemail and do not call back, they call the next name on the list. That is the competitor down the street closing the deal you paid marketing dollars to generate. The cost is the average value of that customer, not the value of a single sale, and for home services, dental, legal, and other high-ticket verticals that number runs from hundreds to thousands. Miss a handful a day and the annual figure in this calculator is usually large enough to fund a full-time hire. The reason it hides is that no invoice ever arrives for revenue you never earned, so it stays invisible until you put a number on it.

What is a realistic recovery rate for a 24/7 AI receptionist?

A well-built AI voice agent answers every call on the first ring, at 2 a.m. and during the lunch rush alike, so the ceiling on recovery is high. In practice you will not capture one hundred percent, because some callers hang up regardless, some are wrong numbers, and some need a human for anything to happen. A conservative planning figure is fifty to seventy percent of currently missed calls answered and moved forward, whether that means booking an appointment, qualifying the lead, or capturing details for a fast callback. The default in this tool is sixty percent, which sits in the honest middle. The point is not that AI answers perfectly, it is that answering most of your missed calls beats answering none of them, and the recovered revenue almost always dwarfs the monthly cost of running the agent. Lower the recovery slider to be cautious and the payback still tends to hold.

How is the payback and ROI calculated?

The tool estimates a monthly cost to run a 24/7 AI receptionist on Hermes by sizing your recovered calls into talk minutes, then matching those minutes to a plan. It multiplies recovered calls per month by the average length of an answered call to get monthly minutes, picks the Hermes plan whose included minutes fit, and adds any overage at the flat rate. Recovered revenue minus that monthly cost is your net monthly gain. ROI is recovered revenue divided by the monthly cost, expressed as a multiple, so a result of ten means every dollar spent returns ten in recovered revenue. Payback in days is how long the recovered revenue takes to cover one month of cost. These are estimates built on your inputs, not a quote, but they are grounded in Hermes pricing of $149, $399, and $699 per month rather than invented numbers, so the comparison stays honest.

Does an AI receptionist replace my front desk or my team?

No, and it is more useful to think of it as a net rather than a replacement. Your team answers the calls they can, and the AI catches everything that would otherwise hit voicemail or ring out, after hours, on weekends, during a rush, or when everyone is already on the phone. That is where the missed-call revenue in this calculator actually lives, in the overflow and the off-hours, not in the calls a human already picks up. The agent books appointments, answers common questions, qualifies the caller, and hands off to a person when the situation needs one, so the front desk keeps doing what it does best while the leak gets plugged. For an agency serving these businesses, that framing sells itself, you are not asking a client to fire anyone, you are showing them money they are already losing and offering to recover most of it.

How does Hermes fit an agency selling missed-call recovery?

Missed-call recovery is one of the easiest offers to sell because the pain is measurable and this calculator makes it concrete on the first call. Hermes is the platform underneath that offer. You build the voice agent, connect it to the client's phone number, and run it under your own brand, so the client never sees the word Hermes. Voice usage is $0.24 per minute all in, and plans start at $149 a month for Starter with 300 included minutes, $399 for Business with 1,000, and $699 for Agency with 2,000, each covering your whole client base. You charge the client a monthly retainer that reflects the recovered revenue shown here and keep the margin, with the CRM, campaigns, and transparent billing built into one platform instead of five stitched together. Book a walkthrough and we will map a real client's missed-call numbers to a plan and a price.

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What are missed calls really costing you?

Every unanswered call is a customer calling your competitor. Put a number on the leak, see the monthly and annual cost, and find out how much a 24/7 AI receptionist recovers and what it pays back.

/ calls missed per dayCalls that ring out, hit voicemail, or come in after hours on a typical day./ close rate (%)Share of answered calls that turn into a paying customer. Keep it honest./ average customer value ($)What one new customer is worth, first job or lifetime value, whichever you price on./ business days per monthHow many days a month the phone actually rings. Around 22 for weekday-only./ AI recovery rate (%)Share of missed calls a 24/7 AI receptionist answers and moves forward. 60% is a fair planning figure./ average call length (min)Typical length of an answered call. Used to size the minutes and pick a plan.

/ what missed calls cost

Lost revenue per month

$16,500

110 missed calls a month at a 30% close rate and $500 per customer.

Lost revenue per year

$198,000

The same leak, compounded across twelve months.

Recovered with a 24/7 AI receptionist

$9,900/mo

About 66 of those calls answered and moved forward, worth $118,800 a year.

Net gain after Hermes (Starter)

$9,751/mo

Running the agent costs about $149/mo for ~264 minutes, a 66.4x return that pays for itself in 1 days.

Book a 20-min walkthrough to cut this number, and we will size an AI receptionist to your call volume and map it to a plan. Want the full breakdown for your agency? Book 20 min.

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how it works

A missed call is a lost customer, not a lost call.

The reason missed-call revenue stays invisible is simple: no invoice ever arrives for money you never earned. When a caller hits voicemail, most do not leave a message and most do not call back, they dial the next business on the list. So the real cost of a missed call is not one sale, it is the full value of a customer who went somewhere else, and you already paid marketing dollars to make that phone ring. This calculator makes the leak concrete. It takes the calls you miss on a normal day, spreads them across your business days, applies your close rate to estimate how many would have become customers, and multiplies by what a customer is worth. The monthly figure is usually uncomfortable. The annual figure is often large enough to fund a full-time hire.

The second half of the tool is the recovery. A 24/7 AI voice agent answers on the first ring, at 2 a.m. and during the lunch rush, so it catches the calls that would otherwise ring out. You will not recover every one, some callers hang up regardless and some need a human, so the tool defaults to a conservative sixty percent of missed calls answered and moved forward. It sizes those recovered calls into talk minutes, matches them to a Hermes plan, and shows recovered revenue against the monthly cost of running the agent. What comes back is a net monthly gain, an ROI multiple, and a payback measured in days rather than months, because for most high-ticket local businesses the recovered revenue dwarfs the cost of answering.

For an agency, this is one of the easiest offers to sell, because the pain is measurable and the fix is obvious. Hermes is the platform underneath it. You build the agent, connect the client's number, and run it under your own brand, so the client never sees Hermes. Voice usage is $0.24 per minute all in, and plans start at $149 a month for Starter with 300 minutes, $399 for Business with 1,000, and $699 for Agency with 2,000, each covering your whole book of clients. You charge a retainer that reflects the recovered revenue shown here and keep the margin, with CRM, campaigns, and transparent billing in one platform instead of five.

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What are missed calls really costing you?

A missed call is a lost customer, not a lost call.

Common questions.

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