To calculate your cost per booked call, divide your total monthly phone-answering cost by the number of calls that actually became scheduled jobs. Two inputs, one division, five minutes a month. It tells you more about whether your phone setup is working than any other single number.
This is the metric behind Cost Per Booked Call: The Number That Actually Matters. Here's how to run it yourself.
Cost per booked call = total monthly answering cost ÷ booked calls that month.
Input 1 — total monthly answering cost. Add up everything you spend to get calls answered:
Input 2 — booked calls. Count the calls from that month that ended with a job on the schedule: name, address, issue, and a service window. Not "calls answered." Not "leads." Jobs booked. If the difference between those categories isn't clear yet, read booked call vs answered call before you count — it changes the denominator more than you'd think.
Worked example. Say your shop's answering cost is a flat $297 a month, and last month you logged 25 booked calls from the phone. That's $297 ÷ 25 = $11.88 per booked call. Now compare that to what you pay per raw lead from LSA or ads — a booked call at under twelve dollars is strong by any shop's standard, because a booked call is already past the lead stage and on the calendar.
Three mistakes skew this number every month:
Run it for three straight months before you judge anything. One storm week or one vacation week can swing a single month; three months shows the real level.
Once you have the number, two comparisons make it useful.
First, compare it to itself over time. A rising cost per booked call usually means missed calls are creeping up or bookings per answered call are slipping — both fixable, but only if you see them. The levers are covered in lowering your cost per booked call.
Second, compare it to your marketing. Owners watch ad cost per lead closely and phone cost per booking not at all, even though the phone is where the leads convert. If you're paying $40 per lead and your booking rate on leads is 50%, your true cost per booked job from ads is $80. A flat-rate answering setup at $297 a month, catching the calls those ads generate, often costs less per booked call than the ads do — and it makes every ad dollar work harder because fewer leads die in voicemail.
That's why to calculate cost per booked call monthly is worth five minutes: it's the one number that ties your phone, your marketing, and your schedule together.
Call the live demo and have Ava call you now — hear exactly what your customers will hear when they call your shop.