Infusion Chair Utilization Calculator

See how full your infusion chairs are and how many more infusions would fit each week.

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Your capacity

Chairs you can staff, not every chair in the room.

From the first chair start to the last checkout.

Days the center runs infusions.

The share of chair-hours you want filled. Your choice, not a standard.

Your volume

Everything on the schedule, before no-shows.

Door to door: vitals, pre-meds, the run, and observation.

Share of scheduled infusions that do not happen that day.

Drug and administration payment, less drug and supply cost.

Example values. Replace them with yours.

Chair utilization 72%. $262,080 margin lost to no-shows a year.

Chair utilization, completed infusions

72%

Target 80%

Available chair-hours a week
450
Used chair-hours a week
322
Completed infusions a week
129
Infusions lost to no-shows a week
11
Margin lost to no-shows a year
$262,080
Extra infusions a week to reach target
15
Added margin a year at target
$355,680

A planning estimate, not a forecast. It assumes chair time is the constraint and a 52-week year. Free, and nothing you enter is sent anywhere.

How to use it
  1. Enter the chairs you can staff, your operating hours and days, and your target utilization.
  2. Add your scheduled infusions a week, average door-to-door chair time, no-show rate, and margin per infusion.
  3. Read your utilization, the margin no-shows cost, and the extra infusions a week it takes to reach your target.
How the numbers work
  • Available chair-hours = chairs × hours a day × days a week
  • Completed infusions = scheduled × (1 − no-show rate)
  • Used chair-hours = completed infusions × average chair time
  • Utilization = used chair-hours ÷ available chair-hours
  • Margin lost to no-shows = scheduled × no-show rate × margin per infusion × 52
  • Extra infusions to reach target = (target × available chair-hours − used chair-hours) ÷ average chair time
  • Added margin at target = extra infusions a week × margin per infusion × 52

With the example values: 10 × 9 × 5 = 450 available chair-hours. 140 × 92% = 128.8 completed infusions × 2.5 hours = 322 used, or 72%. Reaching 80% takes (360 − 322) ÷ 2.5 = 15 more infusions a week.

Before you trust the result
  • Use chair time, not drug run time. The order may say 30 minutes while the patient sits for 90 once vitals, pre-meds, and observation are counted.
  • Count completed, not scheduled. No-shows, same-day cancels, and visits moved for a lapsed authorization inflate utilization if you count the schedule.
  • Do not average across sites or hours. A full site and a half-empty one average out to fine. So do a packed morning and an empty afternoon. Calculate by site, weekday, and hour.
  • Chairs are not always the limit. Nurse-to-chair ratios, pharmacy prep, and a few very long infusions often bind first.
Questions

How do you calculate infusion chair utilization?

Divide the chair-hours patients actually used (completed infusions times average door-to-door chair time) by the chair-hours available (chairs times operating hours a day times operating days a week).

Should chair time include pre-medication and observation?

Yes. The chair is unavailable from the moment the patient sits down until they leave, so use door-to-door time, not only the drug run time on the order.

Where do I get these numbers in WeInfuse?

Start from appointment-level data: appointment status, location, chair, scheduled start and end time, and scheduled duration, plus each location's chair count. Appointments have a scheduled start and end, a scheduled duration, and a chair ID, but there is no check-in or check-out field, so chair time from WeInfuse is scheduled time, not measured door-to-door time. Use an appointment-based Explore so each row is one appointment, filter to completed appointments, and spot-check a few days against the floor. If you add order-level fields, watch for row fan-out.

What is a good chair utilization rate for an infusion center?

There is no single published standard. The right target depends on your staffing, your mix of short and long infusions, and how much room you keep for add-ons and delays. Measure your own baseline from completed appointments, set a target you can staff, and track it by site, weekday, and hour.

Do no-shows count toward chair utilization?

Not in this calculator. It counts only completed infusions, because a chair held for a patient who never comes is empty. Counting the schedule instead makes utilization look higher than what happened on the floor.

What limits infusion capacity besides chairs?

Nurse-to-chair ratios, pharmacy prep time, and a few very long infusions often bind before chairs do. If utilization is below target but the floor feels full, check those first.

Where the definitions come from

For how each of these is defined, see the infusion center KPI glossary. More on pulling appointments, orders, and chairs out of WeInfuse in the WeInfuse reporting guide.

Infusion center KPI glossaryWeInfuse reporting guideTalk to Greyfield Data

Educational estimate only. WeInfuse is a trademark of its owner. Greyfield Data is independent and not affiliated with WeInfuse.

Related tools

Want this from your own data?

Your appointment and order data already holds these numbers by site, chair, nurse, drug, and day of week. We build that report so you can see which hours and sites have room.

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