This is an estimate built from what you typed. We will go through it with you properly, with what the agent would say on your calls, and tell you plainly if it is not worth it for you.
Most calculators multiply missed calls by job value and stop there. That assumes every unanswered call was a customer and that we would win all of them. Neither is true, so the steps in between are here and you can move every one.
Figures we could trace to a named study are marked as such. The rest are either a supplier's own number or our own cautious guess, and both say so. Your own call records beat all of them.