Every service business owner has a gut feeling about missed calls. You know it happens. You know it costs you money. But most people haven't actually calculated the number. When you do, it's usually an uncomfortable surprise.
The missed call cost formula
Here's a simple formula to calculate what missed calls cost your specific business:
Annual Lost Revenue = Missed Calls Per Week × 52 × Loss Rate × Average Job Value
Where:
- Missed Calls Per Week: Check your phone's missed call log for a typical week. Be honest — include evenings and weekends.
- Loss Rate: 68% (based on 80% not leaving voicemail × 85% not calling back)
- Average Job Value: Your typical invoice for a new customer job
Examples by trade
Plumber (3 missed/week, $2,000 avg job):
3 × 52 × 0.68 × $2,000 = $212,160/year
HVAC Company (4 missed/week, $1,500 avg job):
4 × 52 × 0.68 × $1,500 = $212,160/year
Electrician (2 missed/week, $1,800 avg job):
2 × 52 × 0.68 × $1,800 = $127,296/year
General Contractor (3 missed/week, $5,000 avg job):
3 × 52 × 0.68 × $5,000 = $530,400/year
Landscaper (3 missed/week, $800 avg job):
3 × 52 × 0.68 × $800 = $84,864/year
How to calculate your ROI
Now compare your annual lost revenue to the cost of solving the problem:
- Hiring a receptionist: $40,000-$55,000/year (salary + benefits, business hours only)
- Traditional answering service: $3,000-$8,000/year (limited minutes, basic message taking)
- AI receptionist: $1,188/year ($99/month, unlimited calls, 24/7, trained on your business)
The ROI formula is simple:
ROI = (Revenue Recovered - Annual Cost) / Annual Cost × 100
Even if an AI receptionist only recovers 10% of your lost calls, the numbers are overwhelming. For a plumber losing $212K/year:
($21,216 recovered - $3,000 cost) / $3,000 = 607% ROI
And 10% recovery is extremely conservative. In practice, answering every call instead of sending them to voicemail recovers far more.
The bottom line
Don't take our word for it — run the numbers for your own business. Check your missed calls from last week. Multiply by your average job value. Apply the 68% loss rate. The number will probably shock you.
Then ask yourself: is $99/month worth it to stop that bleeding?