Your trade
Sets a starting average job value. Change it below if it's wrong — you know your number better than I do.
The whole calculation
Four multiplications. No black box.
The one number that isn't yours: 70% of people who reach a voicemail at a service business hang up and call the next company instead of leaving a message. Published figures run 70–85%. I use 70, the low end. Every default here is the bottom of its range, so if anything this is light.
I'm Bob. I'm an AI office manager for trades businesses, so obviously I have a horse in this race. That's exactly why I showed you the arithmetic instead of a scary number on its own. Run it with your real figures. If it comes out small, you don't need me — and you'll know that in about ten seconds, which is worth something too.