Room shape 2 of 5
The Standard 12 by 15
This is the room the rules were written for, and it is also the room where this catalog’s gap is most obvious. The border arithmetic on 144 by 180 in gives a target rug of 108 by 144 in — a 9 by 12. There is no 9 by 12 here.
Everything else in this shape is comfortable. There is room for a lamp beside the sofa arm without it standing in a lane. There is wall for a mirror and wall for shelves. The ceiling is high enough that a rod hung near it still leaves an 84 in panel plausible, and low enough that it does not demand a custom length.
So the honest summary for this room is: five of the six rules land on something the catalog carries, and the sixth does not.
The numbers this shape starts from
- Wall to wall
- 12 by 15 ft, or 144 by 180 in
- Ceiling
- 8 to 9 ft, or 96 to 108 in
- Seating footprint
- commonly 96 by 120 in
- Window
- one or two, commonly 36 to 48 in wide
4 figures. These are typical for this shape, not measurements of your room.
What follows, rule by rule
All 6 rules, each landing somewhere different in this shape.
Rug Size to Room Size
rugs
Border arithmetic gives 108 by 144 in. Furniture arithmetic on a 96 by 120 in seating group gives a minimum around 112 by 136 in for front legs on. Both point at 9 by 12, and the catalog stops at 8 by 10.
Curtain Drop and Width
curtains
At a 9 ft ceiling with the rod near the top, rod-to-floor runs close to 104 in and nothing here reaches it. At 8 ft with the rod 4 in above a standard frame, the drop lands near 88 in and an 84 in panel finishes about 2 in high — close enough to read as a choice rather than a mistake.
Mirror Height and Placement
mirrors
There is enough wall here to place the glass by the arithmetic rather than by what fits. For a 70 in person the bottom of the glass wants to be at or below 32 in and the top at or above 68 in, so a 64 or 65 in mirror set with its base near 30 in covers it comfortably.
Shelf Spacing and Load
floating shelves
Wall length stops being the constraint and shelf length becomes it. Every stated length here is 15 to 17 in, so a 10 ft wall takes six or seven shelves side by side with joins showing, rather than two long runs.
Lamp Height to Seating
floor lamps
A sofa at 18 in of compressed seat height with an adult at 26 in of eye above it gives a seated eye near 44 in. Add 10 to 14 in of shade allowance and the lamp height to look for is 54 to 58 in — just under what the catalog’s shortest lamp offers.
Night-Light Placement
night lights
A room this size with two doorways wants two units rather than one bright one, which puts the pack count ahead of the output figure in the decision.
Catalog sizes against those ranges
5 listings whose stated figure can be put against the arithmetic for this shape. This is a comparison of numbers. It is not a claim that any of these suits your room, which depends on measurements only you have.
Links to Amazon on this page are affiliate links. If you buy through one we may earn a commission, at no cost to you. It changes nothing about the numbers below, which come from the listings.
Target rug, 108 by 144 in
Soalmost Washable Area Rug, 8 x 10 ft
The stated 96 by 120 in is one size below the target. It is the closest thing in the catalog and it is still short.
The listing states vintage non-slip, stain resistant, low pile, foldable and lightweight.
Check the listingPanel drop, 84 to 88 in on an 8 ft ceiling
MIULEE Blackout Linen Curtains, 52 x 84 in
The stated 84 in drop falls at the bottom of that range. The stated 52 in width is the widest the catalog states.
The listing states 100% blackout, thermal insulation, a grommet top, a linen texture and 2 panels.
Check the listingMirror, 64 in or taller
DUMOS Arched Full-Length Mirror, 64 x 21 in
The stated 64 by 21 in falls inside the range the arithmetic gives for a 70 in person.
The listing states a nano glass aluminum frame, free standing or wall mounting, and hanging or leaning.
Check the listingLamp height, 54 to 58 in
Ambimall Floor Lamp with Linen Shade, 60 in
The stated 60 in sits just above that range, which puts the shade slightly high rather than slightly low.
The listing states a 9W LED bulb, 3 color temperatures and an adjustable linen shade.
Check the listingTwo or more units for two doorways
Sujeet Night Light, 8-pack
The listing states 8 units, which covers this room and several others.
The listing states a dusk to dawn sensor and warm white LED.
Check the listing
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What does not fit
4 things this shape rules out, and why.
- A 9 by 12 rug, which is what the arithmetic asks for.
- It is not in this catalog at any price or in any pattern. The gap between 5 by 7 and 8 by 10 is the whole range this room needs, and we are not going to pretend the 8 by 10 closes it.
- Every panel in this catalog, on a 9 ft ceiling with the rod hung high.
- That drop is around 104 in. The longest panel here is 84 in, twenty inches short, and no header choice recovers twenty inches.
- A single long shelf run.
- The catalog has nothing longer than 16.5 in. A 10 ft wall in shelves this length is a row of joins, which is a different look from what most people picture when they say floating shelf.
- A 56 in mirror hung at eye level.
- At that height the bottom of the glass sits above the halfway point between eye and floor, so the feet are cut off. The mirror is not too small; it is too high, and 56 in leaves no margin for error on placement.
Keep in view for this shape
- The rule of thumb is decorating practice, not a standard. Nothing here is a requirement.
- A lamp beside the sofa needs its cord routed around the rug edge.
- Where a shelf listing states a capacity, that is the seller’s figure about the shelf, not about your wall.
Sources for this page
3 sources, checked by opening each one.