How the math works
Missed calls a week, times 4.33 weeks in a month (52 weeks ÷ 12), times the share of callers who would have said yes, times what one sale or booking is worth. That is the monthly number. Times 12 is the year.
Every one of those is your own guess or your own figure. There is no industry average in here. If you think your yes rate is lower, lower it. The number will still be yours.
Three ways businesses stop missing calls
Voicemail that becomes a text. The message lands as words on your phone, so you can read it between customers and call back the ones that matter.
A call-back rule. Every missed number gets a text back, from whoever is free next, and the list of who has not been called back yet is on one screen.
A line that answers when you cannot. It picks up, takes the details, books the time if there is one, and hands the rest to you. Every "stop" is honored.
Which one fits depends on how many calls you miss and why. That is a short conversation, not a sales pitch.
A note on the number
This calculator counts the first sale or booking only. Repeat business from a caller you did answer is not in it. If your customers come back, the real cost of a missed call is higher than the number on the page, and we would still rather leave that to you than guess.