How this particular wall divides
The 3 columns leave 2 interior gaps. The two side margins use 16 inches and the gaps use 6 inches, leaving 98 inches for the frame outlines. Dividing that space by 3 gives an outer box width of 32.667 in (≈ 32 11/16″).
Height = (84 − 2 × 10 − 0 × 4) / 1 = 64 in
With a single row there is no interior vertical gap, so only the top and bottom margins reduce the frame height. The top and bottom margins are each 10 inches. The frames are taller than they are wide, with an outer height-to-width ratio of 1.959. Use these proportions as a tape mock-up, rather than assuming they suit the furniture on your wall.
Centerline and boundary checks
The middle column is centered on the wall; its outer edges sit equally far from the centerline. The first outer left edge is 8 in (≈ 8″). The last column starts at 79.333 in (≈ 79 5/16″) and ends at 112 in (≈ 112″), leaving the intended 8-inch right margin. The final row ends at 74 in (≈ 74″). Check these far edges from the same origin you used for the first box.
The 1-inch face width reduces each inner dimension by 2 inches. That leaves 30.667 in (≈ 30 11/16″) by 62 in (≈ 62″) of exposed wall within each outline. The listed cut lengths still use the outside long points. If you want a particular inner opening instead, account for both sides of the profile when you revise the outer geometry.
What the material count means here
This layout needs 6 horizontal pieces at 32.667 in (≈ 32 11/16″) and 6 vertical pieces at 64 in (≈ 64″). There are 12 individual pieces, each with two 45-degree ends. Their combined finished long-point length is 580 inches, or 48.333 feet. The 10% linear allowance adds 58 inches to that budget and produces a 7-stick length estimate.
The longest piece is 64 in (≈ 64″). With a 0.125 in (≈ 1/8″) blade and 0.354 in (≈ 3/8″) reserved for the two 45-degree cuts on each piece, the longest-first cutting plan uses 9 working sticks, leaving 279.757 inches of combined tails after kerf. Those tails may be several separate pieces and cannot be treated as one long board. The combined purchase figure is 9 8ft sticks. Turning off the 10% allowance changes the linear figure to 7 sticks and the combined purchase figure to 9; the working plan still controls the purchase because whole pieces must fit.
Two alternatives worth taping on the wall
Adding one column gives 4 across and 4 frames in total. With the same margins and gaps, each becomes 23.75 in (≈ 23 3/4″) wide by 64 in (≈ 64″) high. The finished material total changes to 58.5 feet, and its combined 8ft purchase estimate is 9 sticks. More columns make narrower panels while adding vertical sides; they do not simply divide the current cut list into smaller pieces.
Keeping the current counts and making each side margin one inch larger changes the outer width to 32 in (≈ 32″), a reduction of 0.667 in (≈ 11/16″) per frame. Its left outer edge shifts to 9 inches. The height stays at 64 in (≈ 64″) and the total becomes 48 feet. This option gives the wall edges more breathing room without moving the top and bottom boundaries.
Before using this cut list
These are calculated examples, not measured installations. Confirm the full 120 × 84 inch area, the actual trim face width, and the locations of cover plates or casing. Mark one frame, dry-fit its corners, and confirm its outer size before cutting the rest. Fractions are rounded display values; use the independent marks in the table so small rounding differences do not collect at the far margin. The stock plan assumes clean 96-inch sticks and the entered kerf. Allow separately for defective ends or additional practice pieces.
Other layouts for this wall width
- 10ft × 9ft wall · 2 columns, 1 rows52.5 × 92 in outer boxes
- 10ft × 7ft wall · 2 columns, 2 rows52 × 31.5 in outer boxes
- 10ft × 8ft wall · 3 columns, 2 rows32 × 35.5 in outer boxes
- 10ft × 8ft wall · 4 columns, 1 rows25.75 × 84 in outer boxes
- 10ft × 9ft wall · 4 columns, 2 rows25 × 45.5 in outer boxes
Read the full method and common mistakes or compare all 36 worked layouts.