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Missed calls calculator, what the silent phone costs you.

Calculate in a minute how many calls you miss and what revenue slips away. Interactive, no service prices, with transparent math. Book a call.

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A missed call disappears silently, shows up on no invoice and still costs revenue. The missed calls calculator makes this silent loss visible. It estimates in under a minute how many calls your business misses today and what revenue slips away over month and year. All numbers are your own inputs, the math is transparent and serves as a rough orientation.

Already have a concrete question about your call volume? Clarify it directly in a strategy call: Book a strategy call or by email at info@ki-telefonassistent.co.

Missed calls calculator

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80 Missed calls per month
40 Of which with buying intent
12 Lost customers or appointments per month
3,000 € Lost revenue per month
36,000 € Lost revenue per year

Illustrative estimate based on your inputs, no prices and no offer. The calculation runs only in your browser.

An AI phone assistant can recover part of it: to the voice ROI calculator
Review your call use case

In detail

What the calculator is for

Almost every business misses calls, but hardly anyone knows the number. Outside opening hours, during peaks, at lunch or when everyone is out, the phone rings into the void. The calculator translates this gut feeling into a concrete amount. It takes your call volume, your estimated miss rate, the share of missed calls with real buying intent and your value per customer and shows what this silent loss adds up to over a year. The result is deliberately conservative and illustrative. It contains no service prices and serves to gauge the scale of the problem, no more and no less.

Process

Input fields

The calculator uses these inputs, with sliders or number fields:

  1. 01 Incoming calls per month (number) Roughly how many calls reach your business per month.
  2. 02 Share of missed calls in percent (slider 0 to 60) Share of calls that go unanswered today, for example outside hours or during peaks.
  3. 03 Share of missed calls with real buying intent in percent (slider 0 to 100). How many of the missed calls were potential customers and not ads or wrong numbers.
  4. 04 Conversion rate from a reachable call to customer or appointment in percent (slider 0 to 100). How often an answered buying-intent call would have become a customer.
  5. 05 Value per won customer or appointment in euros (number) Your average contribution margin or order value per customer.

Tool

Calculation logic

All intermediate values are calculated and shown live.

  • Missed calls per month = Incoming calls x (Share missed / 100).
  • Missed calls with buying intent per month = Missed calls x (Share buying intent / 100).
  • Lost customers or appointments per month = Missed calls with buying intent x (Conversion rate / 100).
  • Lost revenue per month = Lost customers x Value per customer.
  • Lost revenue per year = Lost revenue per month x 12.

Output as three large key figures: missed calls per month, lost customers or appointments per month, lost revenue per year. Below a clear note that this is an illustrative estimate based on your inputs and contains no service prices. Optionally a short line that an AI phone assistant can recover part of these calls, with a reference to the voice ROI calculator.

In detail

How to read the result

The most important figure is the annual lost revenue. Even with cautious assumptions it quickly becomes clear that missed calls add up to a meaningful amount over the year that never appeared anywhere. That is exactly the point: the loss is real even if nobody books it. If your result is noticeable, it is worth looking at how much of it an AI phone assistant could recover. You run that calculation in the voice ROI calculator, and in the strategy call we check your real numbers.

If you want to test this for your real call day, let's clarify the details in a strategy call: Book a strategy call or info@ki-telefonassistent.co.

Booking

Book a strategy call

Book your strategy call via the calendar: Book a strategy call. Alternatively, reach us by email at info@ki-telefonassistent.co.

Or send an email to info@ki-telefonassistent.co

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FAQ

Frequently asked questions

01 What exactly does this calculator compute?
It estimates how many calls you miss and what revenue slips away, based on your own inputs. It shows the silent loss of the status quo, before any solution enters the picture. It deliberately contains no service prices, it is only about your lost potential.
02 How does it differ from the voice ROI calculator?
This calculator shows the loss today, so what the silent phone costs you. The voice ROI calculator goes one step further and estimates how much of it an AI phone assistant can recover. Together they give an honest picture of problem and lever.
03 Which values should I enter when unsure?
Enter the numbers you know best, such as your call volume and value per customer. For the miss rate and buying intent, an honest estimate is enough. Run several scenarios to see a range.
04 Are the numbers reliable?
They are deliberately conservative, illustrative estimates with simple, transparent formulas. They do not replace a detailed analysis but quickly give you a feel for the scale. For a reliable calculation we look at your real call and revenue data in the strategy call.