Every missed-call calculator you will find online, ours included, is doing the same three-step sum. The only thing that differs is which numbers get hidden in the assumptions.
The sum is:
- Missed calls per month — calls that rang out, went to voicemail, or hit a busy signal during opening hours and outside them.
- How many of those were real jobs — not spam, not suppliers, not existing customers asking a question you already answered.
- What one job is worth — the average invoice, or better, the average gross profit on an invoice.
Multiply the three and you have your monthly leak. Ours defaults to 25 missed calls, a $400 job and a 100% assumption — deliberately the most conservative version of the sum, because it claims no conversion rate at all. Some of those callers would have booked anyway; some would have gone elsewhere. We leave that judgement to you rather than inventing a percentage and calling it research.
What the numbers look like with a real input
| Input | Example | Where it comes from |
|---|---|---|
| Missed calls / month | 25 | Your phone system's call log — the only authoritative source |
| Average job value | $400 | Your last 20 invoices, averaged |
| Monthly leak | $10,000 | 25 × $400 — arithmetic, not a study |
| Annual leak | $120,000 | The same figure × 12 |
Read this as a floor, not a forecast. The $120,000 assumes every single missed call was a bookable job worth $400. That will not be true. It is also why we do not publish a "conversion uplift" figure next to it — we have not measured that across enough businesses to claim one.
Why the industry averages you have seen are shaky
The most-quoted statistic in this space — that businesses miss roughly a third of inbound calls — traces back to a 2016 vendor survey of 85 small businesses run by 411 Locals. Eighty-five businesses is a small sample, it is a decade old, and the company sold call-answering services. We cite it because it is the origin of the number, and we label it as exactly that: 411 LOCALS, 2016 — 85 BUSINESSES, VENDOR STUDY.
Other figures floating around — "80% of callers hang up without leaving a voicemail", "a missed call costs $1,200" — generally trace to lead-response vendors or to salary surveys repackaged as call statistics. Where we cannot find a primary source, this site labels the figure industry vendor estimates rather than presenting it as fact.
Your own call log beats all of them. Pull the last 90 days, count the calls that rang out, and you will have a number that is worth more than any published average.
The cost that does not show up on the calculator
The arithmetic above counts lost revenue. It misses three things that are harder to price:
- The review you never got. Someone who called, got voicemail and went elsewhere does not leave you a one-star review. They leave you nothing, and you never learn they existed.
- The after-hours calls. A call at 8pm is not a smaller call. For emergency trades, the after-hours caller is often the highest-intent caller of the day.
- The second call. Customers who cannot reach you rarely try once. They try, fail, and call your competitor — which is a comparison you never get to enter.
What to do about it, in order
- Measure first. Ninety days of call logs. Count ring-outs by hour of day. The hourly pattern usually shows you whether your problem is lunchtime, closing time, or the after-hours window.
- Cover the hours you are losing. If the ring-outs concentrate at 6–9pm, you do not need more staff during the day. You need something answering when nobody is there.
- Text back immediately. A missed call that gets a text within seconds is a conversation that is still open. That mechanism is what missed-call text-back does.
- Re-measure. The same 90-day count, after. If the number moved, the fix worked. If it did not, you have learned something more useful than any benchmark.
Run the sum with your own numbers in the revenue leak calculator, or book 15 minutes and we will go through your call log together.