How the maths works
The calculator runs one formula, in the open: revenue at risk a year = missed calls a week × 46 working weeks × the share that were real jobs × your average job value. The 46 weeks assumes six weeks off a year. Work more and the true figure is higher, not lower.
The share is the only judgement call, so it is yours to make. It starts at 25%, which is an assumption we made up; not an industry statistic. Until you check your own missed-call log against your diary, one in four is a guess; ours as much as anyone’s. Set it to your numbers and the sum becomes yours.
The trade dropdown drops in a suggested average job value for each trade. That suggestion is a starting point to overwrite, not research.
Run your own numbers
Everything on the sheet is editable: the number moves as you type.
Suggested job value only: the maths is yours to overwrite.
One honest week from your phone’s missed-call log.
From your last few invoices.
Editable assumption: the 25% default is a starting guess, not an industry figure.
£50 per missed call, on average
≈ £575 a month
3 missed calls a week × 46 weeks × 25% real jobs × £200 average job
46 working weeks: six weeks off a year. Everything runs on this page: nothing is sent anywhere, and no email is needed to see your number.
What the number does, and does not; mean
Two honesty notes. First, a missed call is not always a lost job: some were spam, some were your mate, some would never have booked anyway. That is exactly why the share is editable instead of fixed at a flattering figure. Second, the total is revenue, not profit; materials and your own hours come out of it. Treat the number as a ceiling: what the unanswered phone could be costing before you spend a penny finding out. The caller behaviour behind the maths is in the real cost of a missed call for UK trades.
Turning the number into answered calls
If the figure runs to more than a few hundred pounds a year, the cheap fixes are not really fixes: interrupting the job you are on to answer, or ringing back at 6pm when the caller has already booked the next tradesperson on Google. The alternative is having every call answered live. A missed call service picks up in seconds, 24/7, and texts you the details, and the full UK price comparison, including what a human answering service costs, is on the call answering service cost page.
What Brring does with your calls
Brring is the AI answering service built for UK trades. It answers every call in a natural UK voice, in your business name, 24/7: taking the caller’s name, number and what is wrong, and texting you the details before you put your tools down. Urgent language, like a burst pipe or a gas smell, triggers an URGENT text to your mobile within seconds, while the caller is still on the line; telemarketers get a polite goodbye and a spam log entry. You can hear a real call handled end to end on the Brring homepage. Setup takes about 10 minutes, you keep your number, and the first 7 days are free; no card needed.