Laminate Countertop Blank Sizes — and How to Cut Your Kitchen From Them

Pre-fabricated post-form laminate countertop blanks are typically 25" deep and stocked in lengths of roughly 4, 6, 8, 10, and 12 ft (48"–144"), with the rolled front edge and backsplash already formed. Exact depth and lengths vary by maker and store, so check the label. That's a different product from raw laminate sheet goods (Wilsonart, Formica), which ship flat at 30"–60" wide by 96"–144" long for shops building their own substrate-and-laminate tops. This page covers the pre-form blank — the one most kitchens actually get installed from — then turns your runs into a cut plan with a free optimizer.

Lay out your run on a 12-ft blank →Free · in your browser · no signup

Standard post-form blank sizes

What you'll typically find at a home center or countertop supplier:

Depth: about 25", which is a 24"-deep base cabinet plus roughly an inch of overhang (same logic as butcher block). Some lines run 25½"
Lengths: 4, 6, 8, 10, and 12 ft (48", 72", 96", 120", 144") are the common stocked sizes; not every retailer carries every length, so confirm what's on the shelf before planning around a specific one
Front edge: the laminate is heat-formed around a rounded front edge and up into the backsplash in one piece. That continuous wrap is what "post-form" means, and it's why you cut blanks to length rather than ripping them to a different depth

Raw laminate sheet goods are the other route — a flat decorative sheet (30"–60" wide × 96"–144" long per Wilsonart's sheet-goods spec) glued to a substrate you build and edge yourself. That's a shop workflow, not a DIY-blank workflow, and it's a genuine 2D nesting problem (multiple countertop pieces cut from one flat sheet) rather than the 1D length problem below.

Worked example: an L-kitchen run, blank length vs. leftover

Say a kitchen needs a 130" main run and a 54" short run (both 25" deep, depth never cut). Three ways to buy:

All 8-ft (96") blanks: the short run fits with 42" left over — but the 130" main run doesn't fit on a 96" blank at all, in either orientation. Flagged, not guessed.
All 12-ft (144") blanks: both runs fit — one blank per run — but the short run's blank has 90" of leftover on a single-use board. Two 12-footers bought, one badly underused.
One 12-ft + one 6-ft (72"): the main run takes the 12-footer (14" leftover), the short run takes the 6-footer (18" leftover) instead of stranding 90" on a spare 12-ft blank. Same two runs, a smaller stock order.

If the two runs meet at a mitered inside corner, measure each run to the long point of the miter, since the miter eats into the length.

The optimizer fits pieces to whatever stock you tell it you have — it doesn't shop for you. Run the list once against "what's on the shelf" and once against a mixed-length buy, then take the plan with less stranded material. That's the same comparison the 2x4 cut calculator recommends for framing lumber; it holds for any material sold in fixed stock lengths.

Inside corners are a shop cut, not a site cut

The other place laminate diverges from butcher block: L-shaped runs need a mitered inside corner, and post-form's rolled front edge makes that miter hard to cut cleanly on site. Two real options:

Factory/shop miter: order the corner pre-mitered (home centers sell pre-mitered sections, and countertop shops cut them to order). This is the usual route for a kitchen L or U layout
Butt seam: a straight joint pulled tight with countertop joint bolts and sealed, used for straight runs longer than your longest blank rather than for corners

Either way, the corner or seam location is a planning decision: land a seam where it's supported by cabinets, keep it away from the sink where water sits, and never put it over an open appliance bay.

Lay out your run on a 12-ft blank →

How to use it

Open the optimizer in linear mode — no account needed (depth is fixed and never cut, so this is a 1D length problem, not a sheet layout)
Enter your blank lengths: 48", 72", 96", 120", 144", or whatever your retailer stocks
Enter each wall run and return as length × quantity
Set kerf (⅛" covers a circular saw or track saw)
Run it once per stock scenario (all one length, or a mixed order) and compare leftover before you buy

The plan prints to PDF for the installer, and re-runs instantly if a run gets remeasured.

Related guides

Frequently asked questions

What sizes do laminate countertop blanks come in?

Post-form blanks are typically about 25" deep, in stock lengths around 4, 6, 8, 10, and 12 ft (48"–144"). Not every length is stocked at every store, and depth varies slightly by line, so confirm before planning a layout around a specific size.

What is the difference between a post-form blank and laminate sheet goods?

A post-form blank is pre-fabricated with the front edge and backsplash already formed — install it and cut to length. Laminate sheet goods (Wilsonart, Formica) ship flat, 30"–60" wide by 96"–144" long, for shops building their own substrate and edge — a 2D sheet-nesting job, not the 1D length problem a pre-form blank is.

How do I plan an L-shaped kitchen in laminate?

Inside corners need a mitered joint, which post-form's rolled front edge makes hard to cut cleanly on site without a router jig. Most people order the corner pre-mitered from the fabricator or big-box cutting service. Straight runs longer than your longest blank need a butt seam instead, placed over cabinet support rather than over an open appliance bay.

Why does the calculator say a run can't fit?

It means that run is longer than every blank length you entered — for example a 130" run against only 96" (8-ft) blanks. That's the calculator catching the problem before you're at the site with a board too short, not a bug.

Does the optimizer pick the cheapest blank order automatically?

No — it fits your parts to whatever stock lengths you enter, but doesn't shop for you. Run the list against what's on the shelf, then again against a mixed-length order, and compare the leftover material between runs to find the cheaper buy.

Can I use this for raw laminate sheet goods instead of a pre-form blank?

Yes — switch to sheet mode and enter the flat sheet dimensions (e.g. 48"×120" Wilsonart sheet goods) as stock, then enter each countertop piece as a part. That's a genuine 2D nesting problem, unlike the fixed-depth blank case above.

Plan your blank order before you buy — free →