Most small dental labs know their prices cold — the fee schedule is taped to the wall and every tech can quote a PFM from memory. Far fewer know their costs: what a single crown, denture, or implant case actually costs the lab to produce.
And without that number, every pricing decision is a guess. Should you take that high-volume account at a 15% discount? Is full-arch actually carrying the shop, or just looking busy? Are you quietly losing money on the job type you do most? You can’t answer any of it from the invoice total.
Here’s how to calculate true case cost — and the margin killers small labs miss most often.
Price is not profit
A $250 case that cost $230 to produce makes you $20. A $180 case that cost $90 makes you $90 — more than four times as much on a smaller invoice. Owners who chase top-line revenue without knowing cost routinely grow their busiest accounts into their least profitable ones, then wonder why a record month didn’t show up in the bank.
True case cost is the number that tells you which work to chase, which to reprice, and which to politely let walk.
The three components of true case cost
1. Materials — at real, current cost
Start with what the case physically consumes: the zirconia puck (or the fraction of it this unit used), the alloy, the denture teeth, the stain and glaze, the model material, the sundries. The trap here is using old prices. Alloy and zirconia costs move; a cost sheet you built eighteen months ago can understate materials by 20–40% and make every case look more profitable than it is.
The discipline that fixes it: cost each material at what you pay for it today, and snapshot that cost onto the case when it’s completed — so historical margins reflect what things actually cost at the time, not what they cost now.
2. Labor — by the step, not by the hour
Labor is where small labs get the fuzziest, because the honest unit of lab labor isn’t “an hour” — it’s “a step.” A crown might pass through design, mill, stain, glaze, and QC, and a different person may have touched each one. If you only know total payroll for the month, you can’t attribute labor to a case.
The cleaner model is piece-wage by step: each production step carries a labor value, and the case’s labor cost is the sum of the steps it actually went through. As a bonus, the same per-step record that gives you case cost also gives you accurate technician payroll — the two stop being separate spreadsheet exercises.
3. Overhead — allocated honestly
Rent, equipment depreciation, utilities, software, the front desk, and the owner’s own bench time are all real costs that don’t attach to a single case. You still have to spread them across the work, or you’ll fool yourself into thinking a thin-margin case is a winner.
You don’t need cost-accounting software for this. A simple, consistent method works: take total monthly overhead, divide by the number of cases you ship in a month, and apply that figure per case. It’s an approximation — but a consistent approximation beats ignoring overhead entirely.
A worked example
Here’s a hypothetical single zirconia crown at a hypothetical small lab — illustrative numbers, not a real client’s:
- Your fee (price): $165
- Materials at real cost: ~$28 (zirconia portion, stain/glaze, model, sundries)
- Per-step labor: design $12 + mill $8 + stain/glaze $14 + QC $4 = $38
- Allocated overhead: $30 (this lab’s monthly overhead ÷ cases shipped)
True cost ≈ $96. Margin ≈ $69, or about 42%.
Now run the same math on a big full-arch case. The invoice is far larger — but so are the materials, the number of labor steps, and the remake risk. It’s entirely possible for the headline-grabbing case to carry a thinner margin percentage than the humble crown. You simply cannot tell which is which without doing the arithmetic on all three components.
The margin killers small labs miss
- Stale material prices. The single most common reason a lab’s margins look better on paper than in the bank. Re-cost your materials at least quarterly.
- Untracked remakes. A remake stacks a second round of materials and labor onto a case you bill once — or don’t rebill at all. Remakes are close to pure margin destruction, and a lab that doesn’t count them has no idea how much they cost. Track every one, with a reason.
- Not knowing who did the work. If labor isn’t credited to the step and the tech who performed it, both your case costs and your payroll are guesses.
- Counting sales tax as revenue. Tax you collect isn’t income — it’s money you’re holding for the state. Strip it out before you compute margin, or you’ll overstate profit on every taxable invoice.
- Forgetting the owner’s hours. If you’re on the bench producing cases, that’s real labor cost even when you don’t cut yourself a piece-wage check. Leaving it out flatters the numbers.
How to actually track it
A spreadsheet is a fine place to start, and far better than nothing. It breaks down at scale for predictable reasons: material prices drift out of date, the steps vary case to case, and you end up re-keying everything from paper case slips at month-end — which is exactly when you have the least time.
The durable fix is to capture the data as the case moves: materials deducted at real cost when the work is done, labor credited per step to the tech who did it, sales tax separated automatically. Do that, and true case cost and margin simply fall out at month-end instead of becoming a weekend project. That’s the whole reason I built LabMate the way I did — case cost isn’t a separate report you assemble, it’s a byproduct of running the case.
You don’t need perfect numbers to begin. You need consistent ones. Pick a method for each of the three components, apply it the same way every time, and within a month you’ll know — not guess — which work actually makes you money.