Calculations NCIDQ, IDFX + IPDX Exam
Questions And Answers Latest 2025
Carpet -
correct answer ✅Length needed in stripes. (Ft)
Add together and divide by 3' to get yards.
Times by 4' for waste.
ROUND UP.
Carpet on Stairs -
correct answer ✅Times number of risers by inches (height).
Times same number of treads by inches (depth)
Add those numbers together.
Add 1" per riser for nosing and wrapping.
Divide by 12 to get feet.
ROUND UP.
Take (ft) number and times by width of stairs.
Divide by 9 to get square yards.
Wallpaper (plain, residential) -
correct answer ✅Calculate perimeter of room in feet.
Multiply by ceiling height.
Add 20% for waste.
,Calculations NCIDQ, IDFX + IPDX Exam
Questions And Answers Latest 2025
Minus 15 sq. Ft per 1 door or 2 windows.
Divide by 36 to get how many single rolls.
ROUND UP.
Wallpaper (w/repeat, residential, half drop) -
correct answer ✅Divide height to be covered by repeat. (Minus
any base or crown)
ROUND UP.
Take that number and times it by the repeat.
Convert inches to feet by dividing by 12.
Calculate the perimeter of the space in feet.
Times that by modified ceiling height (from before).
Add 20% for waste.
Minus windows and doors.
Divide by 36 for SR or 72 for DR.
Wallpaper 54" wide (commercial) -
correct answer ✅Calculate perimeter of room.
Multiply perimeter by height.
Take no deductions for windows and doors unless o we 54".
,Calculations NCIDQ, IDFX + IPDX Exam
Questions And Answers Latest 2025
Divide by 13.5 to get yards.
Times by 3 if linear feet are needed.
Times by $ if cost is needed.
Calculating Draperies (no pattern) -
correct answer ✅Divide window width by 3 to get stacking space.
Add window width, stacking space, return and overlap together.
Return & Overlap = 12"
Multiple this number by fullness factor.
Divide by fabric width (54").
ROUND UP.
Determine cut length by multiplying height of window by 12 to get
inches.
Add header and hem. (Given)
Take panel number times it by cut length number and divide by 36".
ROUND UP.
Draperies with Repeats -
correct answer ✅Divide window width by 3 to get stacking space
in inches.
, Calculations NCIDQ, IDFX + IPDX Exam
Questions And Answers Latest 2025
Add window width, stacking space and overlap (12").
Multiply that number by fullness factor.
Divide by fabric width (given).
ROUND UP. (Number of panels)
Multiply window height by 12 to get inches.
Plus header and hem.
Divide by repeat.
ROUND UP.
Times by repeat.
Times number of panels by modified cut length and divide by 36.
What type of plan is always needed to begin space planning in an
existing building? -
correct answer ✅Base plan
For most planning problems, the most efficient type of circulation
system is what? -
correct answer ✅double loaded corridor
Questions And Answers Latest 2025
Carpet -
correct answer ✅Length needed in stripes. (Ft)
Add together and divide by 3' to get yards.
Times by 4' for waste.
ROUND UP.
Carpet on Stairs -
correct answer ✅Times number of risers by inches (height).
Times same number of treads by inches (depth)
Add those numbers together.
Add 1" per riser for nosing and wrapping.
Divide by 12 to get feet.
ROUND UP.
Take (ft) number and times by width of stairs.
Divide by 9 to get square yards.
Wallpaper (plain, residential) -
correct answer ✅Calculate perimeter of room in feet.
Multiply by ceiling height.
Add 20% for waste.
,Calculations NCIDQ, IDFX + IPDX Exam
Questions And Answers Latest 2025
Minus 15 sq. Ft per 1 door or 2 windows.
Divide by 36 to get how many single rolls.
ROUND UP.
Wallpaper (w/repeat, residential, half drop) -
correct answer ✅Divide height to be covered by repeat. (Minus
any base or crown)
ROUND UP.
Take that number and times it by the repeat.
Convert inches to feet by dividing by 12.
Calculate the perimeter of the space in feet.
Times that by modified ceiling height (from before).
Add 20% for waste.
Minus windows and doors.
Divide by 36 for SR or 72 for DR.
Wallpaper 54" wide (commercial) -
correct answer ✅Calculate perimeter of room.
Multiply perimeter by height.
Take no deductions for windows and doors unless o we 54".
,Calculations NCIDQ, IDFX + IPDX Exam
Questions And Answers Latest 2025
Divide by 13.5 to get yards.
Times by 3 if linear feet are needed.
Times by $ if cost is needed.
Calculating Draperies (no pattern) -
correct answer ✅Divide window width by 3 to get stacking space.
Add window width, stacking space, return and overlap together.
Return & Overlap = 12"
Multiple this number by fullness factor.
Divide by fabric width (54").
ROUND UP.
Determine cut length by multiplying height of window by 12 to get
inches.
Add header and hem. (Given)
Take panel number times it by cut length number and divide by 36".
ROUND UP.
Draperies with Repeats -
correct answer ✅Divide window width by 3 to get stacking space
in inches.
, Calculations NCIDQ, IDFX + IPDX Exam
Questions And Answers Latest 2025
Add window width, stacking space and overlap (12").
Multiply that number by fullness factor.
Divide by fabric width (given).
ROUND UP. (Number of panels)
Multiply window height by 12 to get inches.
Plus header and hem.
Divide by repeat.
ROUND UP.
Times by repeat.
Times number of panels by modified cut length and divide by 36.
What type of plan is always needed to begin space planning in an
existing building? -
correct answer ✅Base plan
For most planning problems, the most efficient type of circulation
system is what? -
correct answer ✅double loaded corridor
