03/06/2026
Most service business owners have never calculated this number. Five minutes, three steps.
You know no-shows cost you money. But "cost you money" is vague enough to ignore. A specific number is not.
Here is the formula. Run it now.
Step 1
Weekly appointments multiplied by your average appointment value. That is your revenue at full attendance.
Example: 40 appointments at €80 each = €3,200 per week.
Step 2
Multiply by your no-show rate. If you do not have one, start with 10%.
€3,200 x 10% = €320 lost per week.
Step 3
Multiply by 48.
€320 x 48 = €15,360 lost per year.
That is the conservative estimate, using a number most practitioners underestimate.
Now do this before you close the tab.
Pull up your calendar for the last four weeks. Count the actual no-shows, the appointments that simply never arrived. Divide that count by your total appointments over the same period.
That is your real rate.
It is almost always higher than 10%.
One more calculation worth running.
Multiply your weekly no-shows by 15 minutes. That is the approximate time spent chasing, waiting, and eventually rescheduling each one. At €20 per hour, that is €5 in overhead per no-show, sitting on top of the lost appointment value.
For a busy practice, that overhead adds €500 to €1,500 per year before you account for a single euro of lost revenue.
What most people find when they run this exercise:
First, their estimated no-show rate was lower than their actual rate. No-shows feel like isolated incidents. The calendar tells a different story.
Second, the annual figure crosses a threshold. It moves the problem from minor nuisance to operational matter worth addressing properly. The two reactions tend to arrive together: "I had no idea it was that high" and "why have I been tolerating this?"
The number most business owners land on is large enough to justify a systematic solution.
It is also small enough that even a modest improvement in no-show rate produces a meaningful return within the first month.
That combination is worth sitting with.