Take a number of locations. Multiply by average calls per week. Multiply by the share that go unanswered, whether that's voicemail, hold, or a line that just rings out. You now have a count of calls that never reached a person. Multiply that by the share of those callers who would have bought something if someone had answered. Multiply by average gross on that kind of sale. That is a weekly number. Multiply by fifty-two and it is an annual one.
Most owners have never run this. Not because the math is hard, it is five multiplications, but because nobody had the call data to start with. Customer service desks and order lines don't log missed calls the way a CRM logs missed leads. The calls just happen, or don't, and the day moves on.
We want to be straight about what this arithmetic is. It is a model, not a promise. It tells you the order of magnitude of the problem, using your own volume and your own numbers, not a case study from somewhere else. It is useful for deciding whether the problem is worth solving. It is not a number anyone should bill against. The audit exists to measure the real one: how many calls actually go unanswered, when, and what they were calling about, before anything gets built.
What the model usually shows is that the number is bigger than people expect, because unanswered isn't rare, it's structural. It happens at lunch, at close, during a rush at the counter, after hours, whenever two things are happening at once and the phone is the third thing.
The instinct is to fix this with another body on the phones. That's expensive, it doesn't cover after-hours, and it doesn't scale evenly across locations with uneven call volume. The actual fix is narrower: make sure nobody waits. A voice agent picks up the call that would otherwise ring out, handles what it can, and hands a clean summary to a person for what it can't. It doesn't replace a team. It removes the version of this problem where the team simply isn't available yet.
Do the arithmetic yourself first. Locations, weekly calls, share unanswered, share that would buy, average gross. If the number that comes out is small, this isn't your problem. If it isn't small, that is what a thirty-minute review and a two-week audit are for: measuring it for real before anyone spends a dollar building anything.