A missed call doesn’t feel like lost money. The phone rings, you’re up a ladder or with a customer, it stops. But the person calling had a job, a booking, or a question with a card behind it — and the next number on their screen answered. Here’s how to put a real figure on that, using your own numbers.

The four numbers you need

Your phone system (or mobile provider’s app) already knows the first one:

  • M — missed calls per month, including out-of-hours. Most owners guess low; check the log.
  • E — the share that were real enquiries, not spam or wrong numbers. A third is a fair, conservative default.
  • C — your conversion rate when you do answer. If half of answered enquiries become jobs, use 0.5.
  • V — average value of a job or first purchase.

The monthly leak is M × E × C × V. A trade missing 10 calls a week (call it 43 a month), a third of them real, converting half, at £300 a job: 43 × 0.33 × 0.5 × £300 ≈ £2,100 a month. Run it with your own four numbers — that’s the figure to hold every fix against.

Why callbacks don’t rescue the money

“I always ring back when I’m free” assumes the caller waited. For urgent work — a leak, a dead boiler, a Saturday booking — they rang the next result the moment you didn’t answer. By the time you call back, someone else has taken the deposit. The leak isn’t rudeness; it’s physics: whoever answers first wins.

The three fixes, cheapest first

1. A booking page that works while you can’t answer. If the call is “can I get an appointment,” a site that takes the booking directly removes the call entirely. Cheapest fix, biggest effect for appointment businesses.

2. Missed-call text-back. The caller instantly gets a message: “Sorry we missed you — reply here or book at this link.” It catches the people who’d otherwise be dialling your competitor within the minute.

3. An AI receptionist. Answers every call, every time, takes the details, books the job, and hands the strange ones to you with a summary. We’ve written an honest guide to what they do, where they fail, and what they cost — including when you shouldn’t buy one.

Which one is right for you?

Run the maths first. If your leak is £200 a month, fix it with the booking page. If it’s £2,000, the answer is usually all three wired together — site, text-back, receptionist, one system that never lets an enquiry fall on the floor. That’s the “never lose a lead” build, and the call to scope it costs nothing.