Every AI phone company quotes a percentage of calls that go unanswered. Ignore all of them. The only number that matters is yours, and you can calculate it this week from data you already have.
Step one: get your real missed-call count
Your phone provider holds this. Mobile networks, VoIP providers and most business phone systems can produce a call log showing inbound calls, answered and unanswered, by hour. Ask for one month.
Two details matter more than the headline number. First, when the missed calls happen — most businesses find a spike in one or two hours a day. Second, how many are repeat attempts from the same number within a few minutes, because those are one lost customer, not three.
Step two: separate the four kinds of caller
- People trying to buy: an order, a booking, a quote. This is the group with a value attached.
- People with a question that decides whether they buy: opening hours, parking, whether you do a thing.
- Existing customers with an admin request: moving a booking, chasing an order.
- Everything else: suppliers, sales calls, wrong numbers.
You will not know the split precisely. A week of tallying on a piece of paper by the phone gets you close enough, and the exercise is usually more revealing than the result.
Step three: apply your own average value
Take your average order value or average treatment value from your till or booking system. Multiply it by the number of buying calls you missed. That is your monthly figure before you argue with it.
Then argue with it honestly. Some of those callers rang back. Some walked in anyway. A reasonable adjustment is to assume half of the missed buying calls were genuinely lost, and see whether the remaining number still bothers you. In most independent restaurants and salons it does.
Step four: add the cost of the calls you did answer
This is the part nobody counts. When a chef stops to take an order, or a therapist leaves a guest to answer reception, the call is answered but something else is paid for it: a slower service, a distracted treatment, an order taken in a hurry and written down wrong.
You cannot put a clean number on that, but you can put a count on it. How many times a shift does someone stop what they are doing to answer the phone? Multiply by the number of shifts. That count is usually what convinces the person who has to work the floor.
What to do with the number
- Decide the threshold that would justify doing something about it, before you look at any product.
- Check the missed-call pattern by hour, because a problem concentrated in two hours has cheaper fixes than one spread across the week.
- If the answer is more staff, cost that properly, including the hours the phone is quiet.
- If the answer is software, insist on seeing what it does when it does not know an answer — that is where the real cost of a bad system sits.
The point of this exercise is not to justify a purchase. It is to stop treating missed calls as background noise and start treating them as a line item you have measured.