Free tool · UK trades
What missed calls are actually costing you.
UK plumbers miss 47-62% of inbound calls. 85% of voicemail-bound callers never try a second time. Plug your numbers in and see exactly what's walking out of your business — per month and per year.
Free tool
What missed calls are actually costing you.
Five sliders. Real maths. Your real number.
How many calls hit your phone in a typical month.
UK SME average is 47-62% (Paperclip / Aira). Solo trades on the tools usually higher.
Industry data (Invoca) puts this at 85% for home-services voicemail.
What share of qualified enquiries become paid jobs.
Set to your typical callout / per-job income.
Estimated revenue from calls that go to voicemail and aren't recovered. Based on the inputs you set above.
For reference: Invox AI Solo is £99/month flat (£1,188/year) for 250 minutes and 1,000 SMS — every call answered, every text replied to, every job booked into your calendar.
From £99/mo · Done-for-you setup · 30-day money-back guarantee
Sources: Paperclip 2025 UK SME survey · Aira UK call-tracking data · Invoca home services research. Numbers are estimates based on the inputs you supply — actual losses vary by trade, region and time of day.
How the maths works
The calculator multiplies five numbers you supply: monthly inbound calls × missed-call rate × no-callback rate × close rate × average job value. The result is an estimate of monthly revenue lost to voicemail. The annual figure is the monthly result × 12.
The default rates are anchored to real UK research:
- 62% missed-call rate — UK call-tracking data published by Aira. The 2025 Paperclip survey of 142 UK SMEs reports 47%. Solo trades on the tools tend to skew higher.
- 85% no-callback rate — home-services data published by Invoca: 85% of callers who hit voicemail never try a second time.
- 30% close rate — a reasonable mid-funnel conversion for UK trades on cold enquiries that reach a real conversation. Adjust to your own.
The result is an estimate, not a guarantee. Every trade business is different. But across hundreds of UK trades surveyed in the underlying research, the pattern is consistent: missed calls cost more than most owners realise, because the lost-forever leads compound silently.
Common questions
How accurate is this calculator?+
It's directional, not audited. The calculator multiplies five inputs you supply — call volume, miss rate, no-callback rate, close rate and average job value — using ratios from public UK research (Paperclip 2025, Aira, Invoca). Real losses vary by trade, season and time of day. Treat the output as a serious upper-bound estimate of what voicemail is costing you, not a guaranteed figure.
Where do the default percentages come from?+
62% missed-call rate is from Aira's UK call-tracking research; 47% is the figure from Paperclip's 2025 survey of 142 UK SMEs. 85% no-callback rate comes from Invoca's home-services research. The default close rate (30%) is a typical UK trades cold-enquiry conversion based on industry-standard sales-funnel benchmarks. Adjust all of them to match your business.
Why is the annual number so much bigger than I expected?+
Most UK trades dramatically under-estimate missed-call losses because they only count the calls they remember. The maths compounds: 30 calls/month × 62% missed × 85% never-call-back × 30% close rate × £180 average job × 12 months = ~£3,400/year. For emergency plumbers and 24-hour locksmiths the number is 5-10× higher because callout values are higher and the calls hit at unsociable hours.
Can I share or embed this calculator?+
Yes. Trade publications, Facebook groups for tradesmen, Reddit communities, accountants who advise UK trades — please share it. Right-click the page link and copy. We'll add proper embed code for trade publications shortly. Email george@invoxai.uk if you want it featured on your site.
What's the cheapest way to stop losing this revenue?+
An AI receptionist that answers every call, regardless of time. UK options range from £29/mo (CallChimps) to £197/mo (Voqal AI). Invox AI is £99/month for Solo or £199/month for Pro, with a £299 done-for-you setup and a 30-day money-back guarantee — not happy within 30 days and you get every penny back, no questions asked. For a busy trade losing £200-£400 a month to voicemail, the £99 plan pays for itself many times over from the first captured boiler call.
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