How do you calculate cleanroom operating cost?

Multiply the room's operating hours by its cost per room-hour and the program's share, then add fixed support. 720 hours at 185 an hour with 88% assigned is 117,216; with 14,500 of validation the program pays 131,716, 182.94 a room-hour, the Cleanroom Operating Cost calculator's own example.

How much energy does a cleanroom use?

Its average electrical load in kW times its operating hours: 48 kW for 720 hours is 34,560 kWh. Measure the load on a sub-meter; air change rates, fan filter units, dehumidification, setbacks out of hours and climate all move it a long way, so the example's loads are invented.

What goes into the other cost per hour?

Everything except electricity that keeps the room under control: environmental monitoring, cleaning, gowning and consumables, filter changes and the staff who run the room, divided by its operating hours. Build it from last year's ledger.

What if the shares do not add to 100%?

Cost is left unallocated, not avoided: the room costs nearly the same at rest under control. The Dashboard shows each room's share charged and the cost no program carries, and the Check column flags a room charged over 100%.

Why show cost per assigned hour as well as per room-hour?

The calculator spreads a program's charge over all the room's operating hours. Per assigned hour divides it by the hours the program actually uses, which is the figure to compare between programs and rooms.

Does the workbook use macros?

No. It is a plain .xlsx with ordinary formulas, tables and native charts. The Verify sheet re-checks the formulas against fixed test charges and shows Self-check: PASS.

Manufacturing Cost and Quoting

Cleanroom Operating Cost Allocation Excel Template

Cleanroom cost per room-hour = average electrical load × electricity price + other running cost per hour, and a program's charge = operating hours × cost per room-hour × its share + fixed support. Build each room's hourly cost, charge it to the programs that use it, and see the room energy in kWh and the room cost no program carries.

Free, and a plain .xlsx with no macros to enable. A CSV with live formulas and a printed how-to guide come with it.

Overview

This cleanroom cost template is a working Excel workbook for cleanroom and facilities managers, plant controllers and cost accountants in medical device, pharma, electronics and optics manufacturing. Each room on Setup has its class, its controlled operating hours in the period, its average electrical load in kW from a sub-meter, and its other running cost per hour: monitoring, cleaning, gowning, filters and staff. The workbook turns those into the room's energy in kWh and its cost per room-hour at your electricity price. Each program's use of a room is a row on Charges with its share of the room's hours and any fixed support and validation cost. The workbook gives the assigned hours and kWh, the assigned operating cost, the total charge, the charge per room-hour and per assigned hour, and flags rooms charged at less or more than 100%. It ships with three rooms and four programs for one month at a fictional contract manufacturer, so every tile and chart is filled in when you open it.

In the example an ISO 7 suite runs 720 hours at an average 48 kW: 34,560 kWh, 6.72 an hour at 0.14 a kWh, plus 178 an hour of other running cost, 184.72 a room-hour. Catheter assembly takes 70% of its hours and optical sensors 18%, so 12% of the suite, 15,960, is charged to nobody. An ISO 5 fill room at 85 kW runs 271.90 an hour, and sterile fill pays 130,058 for its 85% with 14,500 of media fill revalidation. Across the three rooms the month's operating cost is 341,092 and the rooms used 98,660 kWh.

A room charged less than 100% leaves cost unallocated, not avoided. The download is a plain .xlsx with no macros. A CSV with live formulas is also included for other tools; the dashboard, charts, dropdowns and self-check are in the .xlsx.

What this template includes

Setup sheet with your company, currency and electricity price, the rooms with their class, operating hours, average electrical load and other cost per room-hour, and the programs
Charges table, one row per program's use of a room: share of the room's hours and fixed support and validation, with a Check column
Per charge: energy and total cost per room-hour, assigned hours and kWh, assigned operating cost, total charge, and the charge per room-hour and per assigned hour
Dashboard with four tiles (room operating cost, room energy in kWh, charged to programs, room cost not charged), cost per room-hour by room split into energy and other, the charge by program, and the room and program tables
Method sheet with every formula, and a Verify sheet that re-checks the formulas against an independent reference and the Cleanroom Operating Cost calculator (Self-check: PASS)
CSV with live formulas for the Charges table; the dashboard, charts, dropdowns and self-check are in the .xlsx

Suggested use case

Use it to charge cleanroom cost to products or programs in a monthly close, to budget a controlled suite, or to see what a cleanroom's energy really costs an hour.

How to use it

On Setup, type your company, currency and electricity price, list your rooms with their hours, average electrical load and other cost per room-hour, and your programs.
On Charges, give each program's use of each room a row: its share of the room's hours and any fixed support and validation cost.
Fix anything the Check column names.
Open the Dashboard: what each room costs an hour, what each program is charged, and the room cost nobody is charged for.

Frequently Asked Questions

How do you calculate cleanroom operating cost?: Multiply the room's operating hours by its cost per room-hour and the program's share, then add fixed support. 720 hours at 185 an hour with 88% assigned is 117,216; with 14,500 of validation the program pays 131,716, 182.94 a room-hour, the Cleanroom Operating Cost calculator's own example.
How much energy does a cleanroom use?: Its average electrical load in kW times its operating hours: 48 kW for 720 hours is 34,560 kWh. Measure the load on a sub-meter; air change rates, fan filter units, dehumidification, setbacks out of hours and climate all move it a long way, so the example's loads are invented.
What goes into the other cost per hour?: Everything except electricity that keeps the room under control: environmental monitoring, cleaning, gowning and consumables, filter changes and the staff who run the room, divided by its operating hours. Build it from last year's ledger.
What if the shares do not add to 100%?: Cost is left unallocated, not avoided: the room costs nearly the same at rest under control. The Dashboard shows each room's share charged and the cost no program carries, and the Check column flags a room charged over 100%.
Why show cost per assigned hour as well as per room-hour?: The calculator spreads a program's charge over all the room's operating hours. Per assigned hour divides it by the hours the program actually uses, which is the figure to compare between programs and rooms.
Does the workbook use macros?: No. It is a plain .xlsx with ordinary formulas, tables and native charts. The Verify sheet re-checks the formulas against fixed test charges and shows Self-check: PASS.