Most small business owners who investigate AI receptionists make the same mistake: they focus on the cost and forget to calculate the loss. The cost of an AI receptionist is visible - for Softomate's GHL receptionist package, setup from £2,000 and monthly care from £99, plus usage. The loss it prevents is invisible: it is the revenue that walks out the door every time a call goes unanswered.
This guide gives you a five-step framework for calculating your real ROI - not a best-case scenario, not a marketing claim, but your actual numbers based on your call volume, your average job or instruction value, and your current miss rate. The maths are straightforward. The results tend to be startling.
Before working through the calculator, it helps to understand the scale of the problem. A substantial share of calls to UK small businesses go unanswered, and for many service businesses a single answered call can be worth hundreds of pounds or more.
The reason the losses are so large is not just the value of each call but the behaviour of callers who cannot get through. Many callers who reach a voicemail do not call back. They do not try again in an hour. They do not leave a message and wait. They move to the next business on the search results page, and they book there instead. The caller is not lost temporarily. They are lost permanently.
For context on the broader category, read our complete AI receptionist guide and our detailed breakdown of how missed calls cost UK businesses. Then come back here and run your numbers.
The first step is calculating the revenue you are currently losing to unanswered calls. You need three inputs: your average daily call volume, your current miss rate, and your average call value.
Average daily inbound calls. This is the number of inbound calls your business receives on a typical working day. If you are not sure, check your phone system's call log for the past month and divide by the number of working days. If you do not have a log, estimate conservatively. A sole-trader plumber typically receives 20 to 35 calls per day when busy. A small law firm with five fee earners might receive 30 to 50. A dental practice on a typical Tuesday handles 80 to 120.
Miss rate. This is the percentage of your inbound calls that go unanswered. Industry data suggests 27 to 47 percent for UK SMEs. If you have never measured this, use 35 percent as a working estimate - it sits comfortably in the middle of the documented range and tends to be conservative for businesses without dedicated reception staff.
Average call value. This is the revenue attributable to a converted inbound call. For a plumber, this might be the average invoice value for a callout job - typically £400 to £800 for an emergency, £150 to £300 for a routine repair. For a solicitor, it is the average instruction value for the most common matter types - often £1,000 to £3,000 for residential conveyancing, higher for more complex work. For an estate agent, it is the average commission earned per sale or let. Use a conservative estimate - if anything, underestimate so your ROI calculation reflects a floor rather than a ceiling.
Working days per month. Use 22 as the standard figure for a UK business working Monday to Friday. If your business operates six or seven days a week (as many trades businesses do), use 26 or 30 respectively.
The formula is: Daily calls x miss rate x working days x average call value = monthly missed revenue
Example: A plumbing business receives 30 calls per day. At a 35 percent miss rate over 22 working days, that is 231 unanswered calls per month. At an average call value of £800, that is £184,800 per month in potential revenue walking out the door - or £2,217,600 per year. Not all of those calls would have converted even if answered (callers shopping around, wrong numbers, existing clients not requiring new work), so apply a realistic conversion rate. At 10 percent conversion from recovered calls, the recoverable revenue is £18,480 per month.
Worked example at conservative assumptions:
Missed calls do not just cost you revenue from the calls themselves. They cost you the time spent dealing with the administrative fallout: checking voicemails, calling back numbers who may or may not still be available, re-entering notes from callbacks into your CRM or job management system, and handling the frustration of callers who eventually got through but are now annoyed at how long it took.
Research on small business administration time consistently shows that the average SME owner or manager spends 20 to 30 percent of their working week on administrative tasks. Call management is one of the largest components. For a business receiving 30 calls per day and missing a third of them, the callback volume alone - if you are diligent about returning calls - adds up to substantial weekly overhead.
The formula for this step is: Admin hours per week x hourly staff cost x 52 / 12 = monthly admin cost attributable to call management
Example: A business where the owner or a member of staff spends five hours per week managing call-related administration (voicemails, callbacks, message-taking, follow-up). At the current UK National Living Wage of £12.71 per hour (April 2026 rate) or a more typical small business admin rate of £14 to £16 per hour:
For businesses where the owner handles these calls themselves, use your own effective hourly rate - what an hour of your time is worth when not on billable work or generating new business. For a sole-trader electrician earning £60,000 per year working 46 weeks, the effective hourly rate is approximately £28 to £30. Five hours per week of call administration at £28/hour costs £6,760 per year - £563 per month.
Steps 1 and 2 give you two components of the monthly cost of not having an AI receptionist. Add them together.
Using the examples from Steps 1 and 2:
Even stripping the conservative missed call recovery figure right back - say to 5 percent conversion rather than 10 percent - the figure is still £9,240/month in opportunity cost, plus £303 in admin overhead: £9,543 per month that you are leaving on the table.
The point of this step is not to produce a large number that looks impressive in a case study. The point is to establish a realistic baseline of what the current situation is costing you before you factor in the subscription cost of fixing it. That baseline gives you the denominator for your ROI calculation in Step 5.
GHL AI receptionist: complete focused setup: from £2,000 one-off. Essential account configuration, one business/number, one pipeline/calendar, one inbound agent, up to three defined workflows, tests and handover. Monthly care from £99/month. Basic GHL platform access and light support are included in the monthly package; numbers, calls, messages, AI and paid add-ons are extra. Essential account setup is included in the complete receptionist fee and is not charged twice. Prices exclude VAT. Required licences, hosting and usage are itemised before you commit. Care is optional after client-managed handover; additional development is quoted separately.
Per-call pricing models - common among US-based providers and some UK resellers - complicate this calculation significantly. At £0.75 per call, a business receiving 30 calls per day pays £0.75 x 30 x 22 = £495 per month at baseline, and significantly more during busy periods. During a cold snap for a heating engineer, or during a busy property market period for an estate agent, per-call costs can spike to £800 or £1,000 per month for the same functionality. Estimating usage up front and agreeing it before you commit makes the monthly cost far easier to budget.
For a current Softomate GHL receptionist calculation, include setup from £2,000 and the monthly plan from £99. The first-year starting subtotal is £3,188 before VAT, calls, AI, numbers and messages. Add the actual usage estimate and any extra integrations, then compare the total with the value of enquiries you can realistically recover. See the package scope.
With Steps 1 through 4 complete, calculating your net monthly ROI is a single subtraction:
Net monthly ROI = Recovered revenue + Admin time saving - AI receptionist cost
Using the worked example throughout this guide:
At the ultra-conservative 5% recovery rate:
At these numbers, a single converted £800 job a month covers the £99 monthly care, and three converted jobs cover the £2,000 setup, before usage and VAT. For businesses receiving more than 15 inbound calls a day, that threshold is usually achievable.
The table below summarises expected ROI by sector using industry-standard call volume and value data. All figures use a conservative 10 percent recovery rate on missed calls and include an admin time saving of £300 per month.
| Sector | Avg Calls/Day | Miss Rate | Avg Call Value | Monthly ROI (conservative) |
|---|---|---|---|---|
| Plumber | 25 | 40% | £600 | £1,200+ |
| Dental practice | 80 | 30% | £200 | £1,400+ |
| Solicitor | 30 | 35% | £1,500 | £3,500+ |
| Estate agent | 60 | 35% | £3,000 | £8,000+ |
| Letting agent | 100 | 40% | £300/yr fee | £3,200+ |
Notes on the table: the dental figure uses a lower average call value because many dental calls are for low-value routine hygiene appointments. The estate agent figure uses average commission value per instruction rather than per call, which explains the higher absolute figure. The letting agent figure is the confirmed Softomate client result, not a model projection.
For sector-specific analysis, read our posts on best AI receptionist for UK trades and the broader AI receptionist guide.
The ROI model above is based on industry benchmarks. Here are confirmed results from actual Softomate deployments.
London letting agent. A letting agency in London deployed Softomate's AI receptionist to handle their morning call rush. Before deployment, the agency was missing approximately 35 percent of calls during the 8am to 10am peak period - the precise window when landlords and prospective tenants are most likely to call. Within 60 days of going live, the agency had recovered £3,200 per month in management fee income from landlord accounts that would otherwise have churned or from new landlord instructions captured during missed-call periods. Cost: £299 per month. Net monthly gain: £2,901. Annual gain: £34,812.
The figures above describe the historical case, including its original fee. Current package scope and pricing are shown on our AI receptionist service page.
What this tells us about the ROI model. The letting agent result is consistent with the benchmark table above but slightly below the modelled maximum. This reflects the reality that not every recovered call converts to revenue, and that the first 60 days of deployment involve a learning curve as the knowledge base is refined. By month three, most Softomate clients report stabilised and improving recovery rates as the AI's knowledge base is updated based on real call patterns.
The headline figure. Using the plumber example from Step 5 above, the net monthly gain before usage is £2,052, so the £2,000 setup is recovered in roughly the first month and the first-year subtotal of £3,188 (setup plus 12 x £99) within the first two months, before VAT and usage. Use your own agreed usage estimate to finalise the figure.
To discuss your specific numbers with the Softomate team and get a projection built on your actual call data, visit the AI receptionist service page or get in touch directly.
Take a three-person accountancy practice in South London receiving 220 calls per month. At the UK average unanswered rate of 27 to 47%, the practice misses 59 to 103 calls monthly. Each missed call represents a potential new client enquiry worth £800 to £2,500 in annual fees, a tax deadline query from an existing client, or an urgent payroll question from a business client.
Step one: missed call revenue loss. The practice estimates 40 of its missed calls are from potential new clients. At 25% conversion and £1,200 average annual client value, 10 new clients per year are lost through unanswered calls. Over three years (typical client retention), that is £36,000 in lost lifetime value per year attributable to missed calls - £3,000 per month.
Step two: admin time cost. The practice's office manager spends 12 hours per week on scheduling, client query management, and call follow-up. At £18 per hour, that is £216 per week or £936 per month in admin cost that an AI receptionist could reduce by 60 to 70%. Estimated monthly admin cost reduction: £562 to £655.
Step three: total monthly cost of the status quo. £3,000 (missed revenue) plus £650 (recoverable admin time) equals £3,650 per month in recoverable cost.
Step four: AI receptionist cost. Softomate's GHL receptionist package starts from £2,000 setup and £99 per month care, plus calls, numbers, messages and AI usage, which are estimated and itemised before you commit.
Step five: net benefit. £3,650 recoverable monthly cost minus £99 care equals £3,551 net monthly benefit before usage. At that rate the £2,000 setup is recovered within the first month, before usage and VAT.
This worked example uses conservative assumptions: 25% conversion (some practices see 35 to 45% for warm inbound enquiries from referrals), and only counting new client revenue, not the retention value of existing clients who reach a professional response instead of voicemail. At more optimistic assumptions, the return is higher still for professional services firms with high client lifetime value.
Across Softomate deployments, the five sectors with the fastest measured ROI payback are: emergency trades (plumbers, electricians, HVAC) where a single recovered job covers months of subscription cost; private healthcare clinics where a handful of consultations converted from missed calls covers the annual care cost; letting agencies where one recovered tenancy placement covers three to four months of cost; aesthetics clinics where a single treatment booking from an after-hours call covers one month; and specialist professional services (niche solicitors, boutique accountants) where new client lifetime value is high and missed-call conversion loss is proportionally significant. For these sectors, the ROI calculation typically shows the setup recovered within the first one to two months. For lower-ticket businesses - retail, hospitality, general admin - payback takes longer, often several months, so run the numbers carefully before committing.
Businesses in regulated sectors - healthcare, legal, financial services - often see a third ROI category beyond call capture and admin savings: reduced compliance risk. A documented, consistent call handling process that logs every interaction and routes regulated queries to qualified staff reduces the risk of a complaint or regulatory finding. The cost of a single FCA, CQC, or SRA complaint investigation - management time, legal fees, potential fine - is measured in thousands of pounds. Preventing even one per year adds significant value to the ROI calculation that the simple revenue-and-cost model does not capture.
Using monthly care of £99 and an average call value of £500, a single converted call a month covers the care cost and four converted calls cover the £2,000 setup, before usage and VAT. For a business receiving 10 or more inbound calls daily with a 30 to 40 percent miss rate, that threshold is usually reached early. Even for very low-volume businesses, the admin time savings can make a meaningful contribution before any revenue recovery is counted.
It depends on your call value and volume. Monthly care starts from £99, so where your average call value is £300 or more and you miss more than one call a day, the first recovered call in a month typically covers the care cost. The £2,000 setup usually takes longer to recover, often one to a few months, before usage and VAT. In practice, month three typically shows higher returns than month one as the knowledge base is refined and call capture improves.
Yes, and often in your favour. A part-time receptionist costs £800 to £1,200 per month in wages, national insurance, and employer pension contributions - several times the monthly care cost of an AI receptionist (from £99 plus usage). The AI handles all calls 24/7, not just the hours the receptionist works.
Reputable AI receptionist platforms provide a dashboard showing call volumes, call outcomes, booking rates, and escalations. Softomate provides a monthly performance report that shows how many calls were answered, how many were converted to bookings or escalations, and any calls where the AI was unable to resolve the enquiry. Compare your monthly new enquiry volume before and after deployment.
The absolute ROI is typically lower for a sole trader simply because daily call volumes are lower. However, the percentage ROI is often higher because a sole trader has zero backup coverage - every unanswered call is a missed opportunity with no human colleague to pick it up. A team of five has at least some capacity to share call coverage.
We protect the real names of all clients featured in examples and case studies. Every testimonial is from a real client.
More from the blog
Work with us
Book a free 30-minute discovery call with DD and get a personalised automation roadmap.
Deen Dayal Yadav
Online
We use essential cookies to keep the site running. With your permission, we also use analytics cookies to understand how visitors use our site so we can improve it. No data is sold. Privacy Policy
