Free tool
What does one studio membership have to cost you?
Put in your rent, kiln power, staffed hours and member count, and see the price a membership has to clear before it earns anything.
Free tool, no sign up
Can your kilns keep up with your member roster?
Enter your member count, how much they make and your load sizes, and see the weekly firing hours your studio actually needs.
Bisque queue complaints are almost never about the kiln being slow. They are about arithmetic that stopped working when the roster grew. Every member who throws six pieces a month sends each of those pieces through two firings, and each firing occupies a kiln for a cycle plus the cooling hours before anyone can unload without risking a crack.
This calculator turns your roster into weekly firing hours and compares it with the hours your kiln room can actually run. If the share creeps toward full, you are looking at the point where either enrollment gets capped, a second kiln arrives, or the queue stretches and members start asking where their work is.
Your result
Pieces entering the queue weekly
76.2
The greenware arriving on your shelves in an average week.
Firings needed per week
3.6
Bisque and glaze together, since every piece rides through two loads.
Kiln hours needed weekly
94
Total firing and cooling time your roster demands each week.
Share of kiln room capacity used
0.8%
How much of your available kiln running time the current roster consumes.
Anything above roughly eighty percent leaves no room for a failed element, a holiday week or the December sale rush, so treat that as your enrollment cap signal.
Why the queue backs up before the kilns are full
Capacity on paper assumes loads fill evenly and firings start the moment a kiln cools. Real studios lose hours at both ends. A bisque load sits half full for three days waiting on enough dry work, then everything arrives at once before a sale and the glaze fire waits behind it. Members experience the wait, not the utilization figure.
The fix is rarely a bigger kiln first. It is a published firing rhythm, so bisque goes in on set days whether the load is perfect or not, and members plan around it. Utilization drops slightly and complaints drop a lot, which is usually the trade an owner wants.
Reading the number before you buy another kiln
If the share used sits comfortably below three quarters, your problem is scheduling rather than equipment, and a firing calendar with clear intake cutoffs will buy you months. Above that, staffed loading time and cooling hours become the true limit, and a second kiln, even a small one for test tiles and quick bisques, gives the schedule somewhere to breathe.
Before you buy, check the electrical service and the ventilation path. Owners regularly find the kiln itself was the affordable part and the panel upgrade or the hood run was not. Price both, then rerun this with the new kiln added and see how many members the extra capacity actually supports.
Questions about this calculator
How do I estimate pieces per maker if I have never counted?
Count one week of intake on the greenware shelves and multiply by 4.33, then divide by your active roster. Most community studios land somewhere between four and ten pieces per maker per month, with beginners well below regular members. Counting for a single week is more accurate than any figure someone else can give you.
Should glaze loads and bisque loads be entered separately?
This uses one average load size for both because most studios fire the same kilns for each. Glaze loads generally hold fewer pieces since work cannot touch, so if your glaze loads are much smaller, enter a number nearer the glaze figure. The result will be more conservative, which is the safer error.
What if we send some work out to another studio for firing?
Subtract that work from pieces per maker before entering it, and treat the outside firing as a cost line rather than capacity. Studios that lean on an outside kiln during peak season should also run this at their own capacity alone, so they know what happens the month that arrangement ends.
More free tools and working documents
Working document
The kiln queue and shelf audit for a working studio
A four stage audit you can run in one afternoon to find out exactly where pieces go missing between the wheel and the pickup shelf.
Make that number survive the next thirty days
The result above is accurate until a member leaves, an element fails or a December sale doubles your intake. KilnSeat keeps the inputs live instead: dues billed on schedule, firing fees counted at load time rather than reconstructed on a Sunday, wheel seats and shelf inches measured against the roster you actually have. Book a walkthrough and bring the figure you just got.