Moulding Cost Per Frame

RailChop Team · April 2026 · 8 min read

The Short Answer

Moulding cost per frame isn't "linear feet times price per foot." That's the naive version, and it's the reason most shops undercharge.

The honest formula looks like this:

Where effective cost per foot is your purchase price per foot divided by one minus your waste rate. If you pay $4.00/ft for a moulding and your shop runs 20% waste, your effective cost is $5.00/ft — not $4.00/ft. Every frame you cut is carrying its share of the moulding that went to offcuts, kerf, and aged remnants.

If you don't account for that, you're quoting from a number that was never real.

The Naive Formula (and Why It Lies)

Here's what most shops do:

Example: an 18×24 frame with a 1" moulding. Perimeter is 2×18 + 2×24 = 84 inches, plus 8×1" = 8 inches for the four miter corners, for 92 inches total, or 7.67 feet. At $4.00/ft, that's $30.67.

That number is wrong in two directions. It's missing kerf (four cuts × 1/8" = 1/2", which adds 0.04 feet). That's small. But more importantly, it assumes you used 100% of every stick you bought — which you didn't. You used somewhere between 75% and 90% of it, depending on your shop's discipline. The rest became offcuts, short ends, remnants that aged out, or sawdust.

The true cost per frame includes that waste, allocated across every frame you cut. You already paid for it. You should charge for it.

Step-by-Step: Calculate Your Effective Cost Per Foot

This is the number you actually use in pricing. Three inputs:

1. Your purchase price per foot. Straight off the supplier invoice. If you buy in length (chop service), divide the stick price by length. If you buy in chops, the chop price is already per frame — different math (below).

2. Your shop's waste rate. If you don't know it, estimate conservatively at 20%. Most shops that have never measured are in the 18–25% range. Shops running a dedicated optimizer usually land at 8–12%. See "How Much Moulding Waste Is Normal?" for a breakdown by shop type.

3. Your reuse rate for remnants. If you genuinely track and reuse remnants, a portion of your waste becomes recovered. A remnant used in a later frame is essentially free material for that frame. Shops with disciplined remnant tracking recover 30–60% of their offcuts.

Formula:

Where effective waste rate accounts for remnant recovery. If your raw waste is 22% and you recover 40% of remnants, your effective waste rate is roughly 22% × (1 − 0.40) = 13%. So a $4.00/ft moulding has an effective cost of $4.00 / 0.87 = $4.60/ft.

That $0.60 difference per foot compounds across every frame you cut.

Worked Example: 18×24 Frame in a Walnut Moulding

Let's run a real example side by side, naive vs. honest.

Line Item	Naive	Honest
Perimeter (inches)	84"	84"
Miter allowance (8 × moulding width)	8"	8"
Kerf (4 cuts × 0.125")	—	0.5"
Total inches	92"	92.5"
Total feet	7.67 ft	7.71 ft
Cost per foot	$4.00	$4.60
Cost per frame	$30.67	$35.47

The honest number is meaningfully higher — in this example, about a 16% bump on the moulding line. On a frame priced in the $150–$250 range, that's a real margin difference. Across hundreds of frames a year, the gap is margin you either charge for or eat.

Multiply that by the 20+ mouldings in a typical shop catalog and by the mix of frame sizes you actually cut, and the real-world impact compounds quickly.

The Chop Service Case

If you buy chops instead of length, the math is simpler — the supplier priced in their waste for you. Your cost per frame is the chop price plus a fixed join charge plus kerf (which doesn't apply since the supplier cut it). But you pay a premium for chops, typically 20–40% over length pricing. You're paying them to hold your waste risk.

This is why chop service is popular at low-volume shops: predictable cost per frame, no cut optimization needed. It's also why high-volume shops move toward length buying and in-house cutting: the savings on waste rate at scale outweigh the efficiency loss on cutting.

Common Pitfalls

Forgetting to update effective cost when waste rate changes. If you implement a cut optimizer and your waste drops from 22% to 11%, your effective cost per foot drops too. If you don't re-compute and re-quote, you're giving away the savings instead of capturing margin. Set a quarterly reminder to re-measure waste and recalculate effective cost.

Not accounting for kerf on short-pull frames. On small frames (under 8×10), kerf is 3–5% of total moulding. Easy to skip in your head, easy to under-quote.

Treating all mouldings the same. A wide, ornate moulding wastes differently than a narrow, simple one. The physical width changes the optimal cut pattern on a stick. Wide profiles typically have higher effective waste because fewer cuts fit per stick. If you have one catalog effective cost per foot, you're over-charging on narrow profiles and under-charging on wide ones.

Counting remnants as zero-cost when they have an implicit cost. A remnant has rack space, tracking overhead, and an aging risk. Most shops treat them as free inventory. They're not — they're capital tied up in a depreciating asset. Useful to account for, but don't double-charge: in the moulding-cost-per-frame math, remnants consumed by a frame are genuinely zero-cost (the material was paid for in the original batch).

Forgetting the labor cost of handling waste. Tossing offcuts, organizing remnants, hunting for the right piece — that's all labor. Not part of moulding cost per se, but it stacks on top. Shops with good remnant systems spend less time on this than shops with chaotic ones.

Using This For Pricing

Most shops price frames using a rough multiplier on moulding cost — typically 3× to 4× for custom framing, sometimes 5×+ for high-end galleries. If you're using the naive cost number, your multiplier is actually lower than you think. The 3× multiplier on $30.67 gives you a $92 moulding line. But if the real cost was $35.47, your effective multiplier was 2.6×.

That's the difference between a healthy margin and a leaky one. It's also why shops that feel "busy but tight on cash" often have an accounting problem, not a sales problem.

Fix: recalculate effective cost for your top 10 mouldings by volume. Compare to what you're quoting. Update the pricing formula. You don't have to raise prices — you have to understand what the real floor is before you discount.

RailChop and True Production Cost

RailChop's Shop Dashboard computes what we call True Production Cost — the effective cost per foot for every moulding in your catalog, calculated from your actual cut history. Each time you optimize and complete a batch, the dashboard updates: purchased feet, consumed feet, waste percentage per profile, and the effective cost per foot that results.

It also shows the "purchase vs. effective" comparison side by side, so you can see which profiles are running hot on waste and which are dialed in. Narrow profiles with frequent small frames tend to run lean. Wide ornate profiles with mixed frame sizes tend to run hot. The data tells you where to focus.

The Shop Dashboard is a Business-tier feature. The underlying moulding cost calculator on this site does the same math for a single frame at a time — useful for checking your pricing on a one-off quote.