Free tool
Missed-Call Revenue Calculator
Five numbers you already know, and one you probably have not put a figure on: what the calls nobody picked up are costing you a year. Your numbers, your device, nothing sent anywhere.
Your numbers
If you are guessing, your phone system or mobile call log has the real figure. Most owners guess low by roughly half.
This is the honest variable, and the one most calculators quietly set to zero to make the answer bigger. Some people do call back. Most call the next name on the list.
Leaving the phone as it is costs you
$0
a year in work that reached you and went somewhere else
Recovering just one in three of those callers would be worth $0 a year. That is the realistic target, not perfection.
How this is calculated
No hidden assumptions. Everything below runs on the five numbers you entered.
missed = calls x missed%
gone = missed x (100% - callback%)
jobs lost = gone x close%
revenue lost = jobs lost x average job value
Weekly figures are multiplied by 52 for the year and divided by 12 for the month. We deliberately do not add anything for the referrals or repeat work those customers would have brought, so the real number is higher than the one above.
Nothing you type is transmitted or stored. Close the tab and it is gone.
Worked example
The tool loads with this exact business
Sixty calls a week, a $450 average ticket, and honest inputs, including the one most calculators hide: some missed callers do try again.
The ideal way to fill it in
What comes back
$81,081 a year
The ideal next step is printed with the result: pull one real month from your phone system and replace the estimates.
Where it actually goes
The leak is not the missed call. It is the silence after it.
Every owner knows they miss calls. What surprises people when we audit a phone line is how little of the loss happens at the moment of the missed call, and how much happens in the ninety seconds afterwards, while the caller is still holding the phone and deciding whether to try the next name on the list.
Measure it before you fix it
Pull the actual missed-call count from your phone system for one full month, including evenings and weekends. Almost nobody’s guess survives contact with the log, and the gap is usually the argument that ends the debate internally.
Answer in seconds, not minutes
An automatic text back within eight seconds does not close the job, but it stops the caller dialling the next number, which is the only thing that matters in that window. It buys you the hour you need to call properly.
Cover the hours you are not there
For most home-services businesses, a fifth of inquiries land outside working hours. Those are not lower-quality leads. An emergency at 8pm is the highest-intent call you will get all week, and it is the one most likely to go unanswered.
Questions we get asked
Is this not just designed to produce a scary number?
It would be easy to build one that does. The two levers a dishonest calculator pulls are setting the call-back rate to zero and quietly adding lifetime value. This one asks you for the call-back rate and leaves lifetime value out entirely, which makes the figure conservative rather than dramatic. The formula is printed under the result so you can check it against your own arithmetic.
What number should I put for calls missed?
Look it up rather than guessing. Most mobile carriers and every VoIP system will show you missed calls for the last thirty days. Include the ones that rang out while someone was on another line, because from the caller’s side those are identical to nobody answering. If you truly cannot get the number, 20 to 25 percent is the range we most often measure in field trades.
Do people not just leave a voicemail?
Far fewer than owners expect, and the ones who do are usually existing customers. A first-time caller comparing three businesses has no reason to leave a message with any of them when the second name on the list picks up on the second ring.
Would an answering service fix this?
It fixes the ringing, which is real progress. What it usually does not fix is what happens next: the message still has to reach the right person, get qualified, get scheduled, and get followed up if the caller goes quiet. Whether a service, a text-back system, or a person is the right answer depends on your call volume and what your calls are actually asking for. That is a twenty-minute conversation, not a product recommendation.
Where does what I typed go?
Nowhere. The whole calculation runs in your browser. There is no form to submit, no email gate on the result, and nothing is logged. Close the tab and the numbers are gone.
Who built this
The same math we run before we fix a phone line
This calculator is the first twenty minutes of one of our phone-line audits, published. Omar Ramos, our founder, is a systems engineer and program manager with 16+ years of building operational systems, and the arithmetic above is what we run against a client’s real call log before we recommend anything.
When the number is worth acting on, the usual fix is missed-call text back with an AI receptionist behind it for the calls that need a conversation. The longer version of why the silence after the call is the expensive part is in What a missed call really costs. Once you know the size of the leak, check the other half of the equation with the Lead Response Time Grader. For the whole picture across answering, coverage, and speed, run the Lead Leak Self-Audit.
Built and maintained by Project Driver. Last reviewed August 2026.
Let’s talk
Want that number benchmarked against your actual line?
On the first call we pull your real missed-call log, work out which hours are leaking, and tell you what recovering them is worth, whether or not we ever work together.