What is your empty chair time costing?
Your operatories cost the same whether they’re busy or not. Move the sliders to see the production sitting in unfilled hours — and what reaching a realistic schedule would add.
Based on 46 clinical weeks a year. Your chairs, rent, and team are paid for whether or not they’re busy — so unfilled hours cost you close to full margin, not just revenue.
Empty chairs are the quietest expense in the practice
Most practice owners can tell you their production figure and their marketing spend. Far fewer can tell you what share of their available chair time actually produced last month — which is a problem, because that gap is usually larger than anything marketing could add in the same period.
The reason is that the cost is already committed. Your surgery lease, equipment finance, and salaried clinical hours are paid whether a patient is in the chair or not. An unfilled hour therefore costs you close to full margin, not merely the revenue of the appointment that did not happen. That asymmetry is what makes utilization worth measuring before you buy more demand.
It is also why the sequence matters. If your schedule has holes, the first questions are whether you are capturing the demand you already generate — unanswered calls, no-shows, patients overdue for recall who were never contacted — before adding new-patient volume on top. Filling chairs from your existing list is almost always cheaper per appointment than acquiring a stranger.
A note on the target: full utilization is the wrong goal. A schedule with no slack cannot absorb an emergency or a run-over, and rigidity costs you in other ways. This model prices the upside to a realistic 85%, not a theoretical 100%.
Frequently asked questions
Chair utilization is the share of your available clinical chair time that is actually producing. If you have four operatories open eight hours a day and half of one sits empty, your utilization is roughly 87%. It is the cleanest single measure of whether your schedule — not your marketing — is the constraint.
Aiming at 100% is a mistake: you need buffer for emergencies, run-over, and turnover. A well-run schedule tends to sit in the mid-80s, which is why this calculator models the upside to 85% rather than to a full book. Consistently below about 70% usually points to a demand or scheduling problem worth fixing before adding capacity.
Because the cost is already committed. Rent, equipment finance, and salaried clinical time are paid whether the chair is busy or not, so an unfilled hour loses close to full margin rather than just revenue. That is what makes utilization one of the highest-leverage numbers in the practice.
Usually in this order: stop losing the demand you already have (unanswered calls and no-shows), reactivate lapsed and overdue-recall patients who are already in your system, then add new-patient demand. Buying more marketing before fixing capture and recall tends to raise cost per patient without filling the schedule.
No. This is a planning model that runs entirely on the numbers you enter, using a 46-week clinical year and an 85% realistic ceiling. It is meant to size the opportunity and show where to look first — not to predict a result.