Free calculator
How much are missed calls
costing your business?
UK businesses miss 22% of inbound calls on average. Enter your numbers below and see the annual revenue walking out the door — and what it would cost to stop it.
Your numbers
Fixed assumptions: 22% missed-call rate · 80% of callers don't leave voicemail · AI agent cost £500/month
Your result
Missed calls / week
11
of your 50 weekly calls
Lost enquiries / week
8.8
who don't call back
Revenue lost / week
£704
3.5 lost customers
Revenue lost / year
£36,608
With a voice AI agent
Return on investment
6.1×
How the calculation works
22% of your calls go unanswered
Research from BT and UK telecoms providers consistently shows UK SMEs miss between 20–30% of inbound calls. Lunch hours, busy periods, and after-hours calls are the biggest windows.
80% of missed callers don't leave voicemail
When callers hit voicemail, 80% hang up and call the next business on their list. A missed call is not a deferred conversation — it is a permanently lost opportunity.
Your conversion rate and value determine the cost
The lost customers per week is simply: (missed calls × 80%) × your conversion rate. Multiplied by your average transaction value, that gives a weekly revenue leak. Annualise it and the number is almost always larger than expected.
A voice AI agent answers every call
A deployed voice AI agent picks up every inbound call, 24/7 — no engaged tone, no voicemail. It handles bookings, qualifies enquiries, and captures contact details within the call. The typical monthly cost is £300–£800 depending on volume.
Frequently asked questions
Where do the percentages come from?
The 22% missed-call rate and 80% voicemail-hangup rate are drawn from BT telecoms research and widely cited UK SME data. They are conservative mid-range figures — businesses without dedicated reception staff typically see higher miss rates.
What does an AI voice agent actually cost?
A focused single-workflow deployment — one phone number, one call type — typically costs £300–£800 per month including infrastructure and ongoing support. The ROI calculator uses £500/month as a mid-range estimate.
Is the ROI calculation accurate for my business?
The calculator uses industry averages. Your actual result will depend on your specific call mix, conversion funnel, and transaction values. It is a directional tool — the precise number is less important than the order of magnitude.
How quickly could I deploy a voice AI agent?
A focused single-workflow deployment — one phone number, one call type — typically takes four to six weeks from initial scoping to going live. Most clients see a full payback within the first month of operation.
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See a voice AI agent in action
Talk to a live demo, no sign-up required. Most pilots launch in two to four weeks.