Baseboard & Trim Cut Calculator — Fewer Sticks, Cleaner Joints

Baseboard and crown molding are stocked in 8, 12, and 16 ft lengths (96", 144", 192"); door and window casing is stocked in 7 ft lengths (84") to clear a standard 80" door with room for the head reveal. This calculator takes a room's trim list — wall runs, casing legs, heads — and packs it onto those stock lengths so long wall runs get a single uninterrupted board and the short pieces come out of what's left, instead of you buying "enough plus a couple extra" and guessing at the joints. Kerf-aware, fractions supported, free in your browser, no signup.

Pack your baseboard run onto 16-ft sticks →Free · in your browser · no signup

Standard trim stock lengths

The facts that drive a trim order, verified 2026-09 against Home Depot and Lowe's baseboard, crown, and casing listings:

Baseboard / base moulding: stocked at 8, 12, and 16 ft (96", 144", 192") in primed MDF and finger-jointed pine, the two most common trade profiles
Crown moulding: the same 8/12/16 ft stock lengths as baseboard, same materials
Door and window casing: stocked at 7 ft (84") — sized to clear a standard 80" door opening with 3–4" left over for the head reveal above; that's also why a stock 7-footer packs almost perfectly against one door leg with barely any drop
Kerf: figure ⅛" per cut on a miter saw — small per cut, but it adds up on a room with a dozen corners

The reason a cut calculator earns its keep on trim specifically: a wall run longer than your stock length cannot be spliced invisibly. If a wall measures 15 ft and you only have 12-ft sticks on hand, there is no clean answer — you either buy the 16-footer or accept a visible joint. Knowing that before you're standing in the aisle is the whole point.

Worked example: baseboard for a 12×15 bedroom

A 12 ft × 15 ft bedroom with one 32" door has a perimeter of 54 ft, minus the door opening — 616" (about 51⅓ LF) of baseboard, broken into wall runs: two 15-ft walls (180" each), one full 12-ft wall (144"), and the door wall split by the opening into 58" and 54" segments.

Run that list on 16-ft (192") sticks and the optimizer returns 4 sticks at 80.2% overall yield: each 180" wall run takes its own stick (12" drop apiece), the 144" wall takes a third (48" drop, usable for the closet return), and the 58"+54" pair shares a fourth stick.

Run the same list on 12-ft (144") sticks instead and the calculator flags 2 pieces as unable to fit — both 180" wall runs are longer than a 12-footer, full stop. That's not a bug in the tool; it's the answer. A 15-ft wall needs at least a 16-ft stick or a visible splice, and the only way to know that before the truck leaves the yard is to run the actual wall lengths, not the total linear footage.

Casing runs low-yield by design — that’s not waste, it’s geometry

A door needs two 83" legs and a 42" head; a 36"×48" window needs two 51" legs and two 42" top/bottom pieces. Run one door plus two windows — 11 pieces total — on 7-ft (84") stock and the optimizer returns 11 sticks at 62.8% yield, because most of these lengths are just over half a stick: two 42" pieces plus kerf come to 84⅛", a hair past what an 84" board holds, so each 84" stick nets exactly one head or one leg.

That's not the calculator performing badly — it's casing geometry. The fix a padded estimate never surfaces: buying one length that fits two heads cleanly (a longer stock, or ripping standard-length overage across two openings) beats buying "extra 7-footers." Run the list both ways and compare the stick count before you order.

Pack your baseboard run onto 16-ft sticks →

How to use it

Open the optimizer in linear mode — no account needed
Enter your stock: 96" (8 ft), 144" (12 ft), 192" (16 ft), or 84" (7 ft) for casing — mix lengths if the yard stocks more than one
Enter each wall run, leg, and head as length × quantity; fractions like 92⅝ work as typed
Set kerf (⅛" covers most miter saws)
Run it: you get sticks to buy, a cut plan per stick, and any piece that can't fit flagged so you catch a too-short stock length before cutting

The plan prints to PDF for the miter station and re-runs instantly if a wall gets remeasured.

Same engine for base, crown, casing, and shoe

The optimizer doesn't care about the profile — it needs lengths, quantities, and kerf, so one project covers:

Base and shoe/quarter-round — run together since they follow the same wall lengths
Crown moulding — same 8/12/16 ft stock, add the extra length a coped or mitered corner eats
Door and window casing — legs and heads as their own material group so they don't compete with baseboard for the same sticks
Chair rail and picture rail — same wall-run math as baseboard

Group each profile as its own material in one project and get one combined stick order instead of running the numbers four times. For framing lumber upstream of the trim package, see the 2x4 cut calculator; for the full dimensional-lumber picture, see the lumber cut list calculator.

Related guides

Frequently asked questions

What lengths does baseboard come in?

Baseboard and crown moulding are stocked in 8, 12, and 16 ft lengths (96", 144", 192") in primed MDF and finger-jointed pine, verified against current Home Depot and Lowe’s listings. A wall run longer than your longest stock length cannot be cut in one piece — it needs a splice or a longer special-order stick.

What length is door and window casing sold in?

Casing is stocked at 7 ft (84"), sized to clear a standard 80" interior door opening with room for the head reveal above. That 7-ft length is also why one stick packs almost exactly one 83" door leg with barely any drop.

How much baseboard do I need for a room?

Take the room’s perimeter and subtract door openings (windows don’t interrupt baseboard). A 12×15 room with one 32" door needs about 51⅓ linear feet. But the total footage alone doesn’t tell you what to buy — enter each wall run separately, since a run longer than your stock length needs a longer stick, not just more footage.

Why does the calculator say a piece can’t fit?

It means that piece is longer than every stock length you entered — most often a wall run longer than a 12-ft stick. That’s the calculator catching a real problem (buy 16-ft stock, or plan a splice) before you’re at the miter saw short a board.

Does the calculator account for miter and coped corners?

It optimizes straight cut lengths and kerf; add the extra length a mitered outside corner or a coped inside corner eats (typically the trim’s face width) to that wall’s entered length before running the list.

Can I run base, crown, and casing in the same project?

Yes — enter each as its own material group so the optimizer doesn’t mix a 16-ft baseboard stick with a 7-ft casing stick. One project, one combined order, one PDF for the miter station.

Nest your trim package on 16-ft sticks — free →