Free tool
What are missed calls costing you?
Move the sliders to match your business. Every assumption is on this page and every number is adjustable — because a calculator you can't argue with isn't worth much.
Everything that rings — new enquiries, existing customers, the lot.
After hours, during jobs, on the other line, lunch. If you've never measured it, most owners guess low.
One job, or a year of repeat business — whichever matches how you think about a customer.
Your close rate on answered calls. Missed callers are assumed to convert at this same rate.
The honest lever. Some people leave a voicemail or ring again — those aren't lost. Only the ones who call your competitor instead are.
Estimated revenue lost per year
$0Based on the numbers above.
Show the detailed breakdown
Step 1 · Missed calls per month
Step 2 · Of those, the ones who never call back
Step 3 · Customers you lose
Step 4 · Revenue lost per month
Step 5 · Revenue lost per year
Figures are rounded for display, but each step is calculated from the unrounded value before it — so multiplying the rounded numbers by hand may land a few dollars off. The 4.33 is the average number of weeks in a month (52 ÷ 12).
How the math works
No black box. Five steps, in order — and “Show the detailed breakdown” above runs every one of them with the numbers you entered, so you can check the arithmetic yourself.
- Missed calls per month — weekly calls × the percentage unanswered × 4.33 weeks.
- Callers who don't come back — of those, the percentage who never ring again.
- Customers lost — those callers, converted at the same rate you close answered calls.
- Revenue lost per month — customers lost × your average customer value.
- Revenue lost per year — that monthly figure × 12.
What this figure is, and isn't
It's an estimate built entirely from your own inputs. We don't add an industry statistic, a fudge factor, or a number from a study you can't check. If you change a slider, only your own assumption changed.
It will be wrong in one direction or the other, and the biggest reason is that most owners don't actually know their unanswered rate — they estimate it from memory, which tends to run low, because the calls you never hear about are exactly the ones you don't remember. If you want the real number, your phone provider's call log has it.
Treat the output as the size of the problem, not an invoice. The useful question isn't whether it's precisely right — it's whether the figure is big enough to be worth fixing.
What we'd do about it
We build AI receptionists that answer every call, at any hour, in your business's voice — they qualify the caller, book into your calendar, and hand you a summary. Nothing here is a quote; what it costs depends on your call volume, which is exactly what you just estimated.
Book a 20-minute call and we'll go through your real numbers instead of these sliders.
Your privacy
This calculator runs entirely in your browser. Nothing you type is sent to us, stored, or saved anywhere — no cookies, nothing kept on your device. Close the tab and it's gone.
For completeness: our host adds a small script to every page that measures how fast it loads. It doesn't see your inputs, set cookies, or identify you. Our Privacy Policy spells this out.
Bring that number to a call.
Twenty minutes. We'll work through your real call log instead of these sliders — and tell you if the figure isn't big enough to be worth fixing.