Every owner knows missed calls are bad. Very few have run the arithmetic on their own numbers, and the ones who do are usually unpleasantly surprised. Here's how to work out the real figure for your company using data you already have.
Start with the number you're not looking at
Most phone systems report answered calls. Fewer make it easy to see the calls that rang out, hit voicemail, or were abandoned while on hold — and almost none break that down by hour. That breakdown is where the money is.
Pull ninety days of call logs and sort them into four buckets:
- Answered during business hours. Your baseline.
- Missed during business hours. Everyone was on another line, or out.
- After hours, voicemail. Evenings, nights, weekends, holidays.
- Abandoned. Rang or held, then hung up before anyone picked up.
For most home service companies, the last three combined are considerably larger than owners expect — and the after-hours bucket is often the biggest single one, because that's when homeowners are actually home and discovering that the heat is out.
The four places the cost hides
1. The job you didn't book
The obvious one. A caller with a broken water heater doesn't leave a voicemail and wait — they work down the search results until someone picks up. The cost here is straightforward: missed calls that would have booked, multiplied by your average ticket.
To estimate the conversion rate, use your answered call-to-booking rate as the proxy. If 55% of answered calls become jobs, assume something in that range for the missed ones. It's not exact, but it's defensible, and it's far better than guessing at the total.
2. The customer you didn't keep
This is the expensive one, and the one most calculations skip. A first-time caller who books elsewhere doesn't just cost you that job — they cost you their next several years. If your average customer produces a maintenance visit and a repair each year, plus an eventual system replacement, the lifetime figure dwarfs the single ticket.
A missed after-hours call in January isn't a lost $400 service call. It's a lost $400 service call, four years of maintenance, and the $9,000 replacement that goes to whoever answered the phone that night.
3. The marketing spend you wasted
If you're paying for Google Local Services, Angi leads, or search ads, every missed call is a lead you already bought and then threw away. Take your monthly marketing spend, divide by total inbound calls, and you have a cost per call. Every unanswered ring is that number, burned.
Owners often find this figure more motivating than the revenue one, because it's money that has already left the bank account.
4. The reputation you didn't build
Harder to quantify, real anyway. The company that answers at 10pm gets described that way to neighbours. The one that didn't gets described that way too.
Putting it together
A workable formula, in the order you should calculate it:
- Missed calls per month — from your phone logs, all three missed buckets.
- × your answered call-to-book rate — the jobs those calls represent.
- × your average ticket — immediate revenue lost.
- + (new customers lost × customer lifetime value) — the long tail.
- + (missed calls × cost per lead) — the marketing spend wasted.
Run that on ninety days of your own data before you read another word of anyone's marketing, ours included. If the number is small, you have better things to fix. If it's not, you now know precisely what you're deciding about.
Why the after-hours bucket is the interesting one
Business-hours misses are a staffing problem with a familiar shape — more people, better call routing, an overflow answering service. Owners have been solving that one for decades.
After-hours is different, because the traditional options are all bad. Voicemail loses the caller. An answering service takes a message but can't see your schedule, can't tell an emergency from a routine request, and can't book anything — so the caller is being asked to wait until morning while their basement fills with water. An on-call rotation works, but it burns out your best people.
This is the specific gap that changed with AI voice agents. Not because AI is impressive, but because the alternative was always so weak. An agent that can read the live schedule, understand that "I smell gas" is not a next-Tuesday problem, and book a real appointment into a real slot is a different category of thing from an answering service.
What to do with the number
Whatever you conclude about software, the calculation is worth doing annually. It tells you whether your next hire should be a technician or a CSR, whether your marketing spend is efficient, and whether your phone system is quietly costing more than it saves.
If you'd like to see how an AI agent handles this in practice, ours is on a public line — 1-218-380-6860. Call it, try to book a job, try to confuse it. That'll tell you more than another article will.