What this looks like by industry
The 27%/64% averages above are useful for a rough gut-check, but the real number depends heavily on what you do and how a missed call actually costs you. A few worked examples:
Trades and home services — a tradie taking 20 calls a week at a $350 average job value, missing a conservative 27% of them, is looking at roughly $2,650/month in jobs that never got booked. The sting here is compounding: a missed emergency call (burst pipe, no hot water) rarely gets a second attempt — the caller rings whoever picks up next, and that's usually the last time they try you for anything.
Restaurants and venues — higher call volume (35+ a week isn't unusual for a busy venue) but lower average value per booking ($120) still adds up to roughly $1,300/month, concentrated almost entirely in the exact windows — mid-service, Friday and Saturday nights — when nobody has a free hand to answer.
Medical and dental practices — a busy front desk missing 22% of 25 weekly calls at a $180 average visit value works out to roughly $1,700/month. The harder cost to put a number on: a new patient who can't get through often becomes a long-term patient at the practice down the road instead, not just a missed appointment.
Real estate agencies — lower call volume but each missed call risks a genuinely large downstream value (a buyer or seller lead), which is why even a 25% miss rate on 15 weekly calls is worth taking seriously, even using a conservative per-lead value rather than full commission.
Every one of these has its own calculator pre-loaded with realistic defaults on its industry page — worth running your own numbers rather than relying on the home-services default above.
How this calculation actually works
To be transparent about where the number on this page comes from: it's weekly calls × missed-call rate × an assumed 40% conversion rate × average booking value, extrapolated to a month and a year. The 40% conversion assumption is deliberately conservative — not every missed call would have become paying business, and this model doesn't pretend otherwise. If anything, treat the output as a floor, not a ceiling: it doesn't account for the customers who call once, don't get through, and never call back at all — which is the more common outcome than a callback, per the voicemail behaviour covered below.
Why voicemail doesn't solve it
The instinctive fix is voicemail, but it barely moves the number. Most callers who reach a voicemail simply don't leave one — they hang up and call the next business on the list. Voicemail turns a missed call into a slightly-more-annoying missed call; it doesn't turn it into a booking.
A full-time receptionist fixes the problem while they're at their desk, but costs $70,000–$85,000 a year once you include super, leave, and training — and still can't cover after-hours, lunch breaks, or two calls at once. See how the two options actually compare in AI receptionist vs virtual receptionist vs answering service.
What to do with this number
If the figure above is meaningful to your business, three things are worth doing before anything else:
- Track your actual miss rate for a week — most business owners guess low. Check your phone's call log against how many of those calls you actually answered and acted on.
- Work out which calls matter most — an after-hours emergency call and a general enquiry aren't worth the same to you, even if they're both "one missed call" in the log.
- Decide what "good enough" looks like — you don't need to answer 100% of calls to fix most of this problem; closing the gap on your highest-value missed calls (after-hours, lunch breaks, multiple calls at once) usually captures most of the revenue on this page.
From there, the actual fix is straightforward, even if the maths above feels abstract:
The actual fix
An AI receptionist closes the gap voicemail and a single human front desk both leave open — it answers every call, every time, has an actual conversation, and books the appointment on the spot instead of promising a callback. That's the difference between a missed call and a converted one, whether that's a trades callout, hospitality booking, or a patient appointment.
A few common objections
"My miss rate is nowhere near 27%." Good — plug your real number into the calculator above. Even a 10% miss rate on meaningful call volume is usually still a five-figure annual number once you extrapolate it out; the point isn't the specific percentage, it's that most owners have never actually measured it.
"I already have voicemail transcription / a missed-call text-back tool." Those are genuine improvements over silence, but they still don't book anything. A transcribed voicemail or an auto-text still requires the caller to wait for a human callback, and a large share of callers have already moved on by the time that callback happens — the outcome is a slightly more informed missed call, not a converted one.
"This feels like a sales pitch dressed up as a blog post." Fair — the maths above is the same maths any accountant or business coach would walk you through, and you don't need to buy anything to benefit from actually tracking your miss rate for a week. What you do about it afterwards, including doing nothing, is a separate decision.
If you want to see what your own missed calls are costing you, or hear an AI receptionist handle a live call, get in touch — +61 3 4052 7962 or book a free 15-minute consult.