Worked example: one wall, one window, straight match
Inputs, roll list, and assumptions in HTML.
- Inputs
- Wall 400 cm wide and 240 cm high. Roll width 53 cm. Roll length 10.05 m (1005 cm). Pattern repeat 64 cm. Allowance 10 cm. Match: straight. Window 120 cm × 140 cm with its top-left at x = 140 cm, y = 50 cm.
- Result
- 8 strips. Each cut is 256 cm. 3 strips fit on a roll. 3 rolls. Leftover: 237 cm, 237 cm, and 493 cm. Last strip width 29 cm. Opening area 16,800 cm², trimmed from the strips, not deducted from the roll count.
- Assumptions
- No seam overlap. Repeat is the match length. Allowance is added before rounding up to a whole repeat. A window does not reduce the number of strips. Half drop is a different example (cut length 320 cm on this wall).
- Check
- 250 ÷ 64 = 3.906, which rounds up to 4 repeats. 4 × 64 = 256. 1005 ÷ 256 = 3.93, so 3 strips per roll. These figures are arithmetic, not a manufacturer guarantee.
Repeat it on cutting plan. Drag the window on windows.