How do I calculate room size?

Multiply length by width for square footage. Measure at floor level and at the narrowest point of each run, and for an irregular room split it into rectangles, calculate each, and add them. Square footage tells you the floor you have; it does not tell you what fits, because shape and door position decide that.

What is the average bedroom size?

A US secondary bedroom is typically 10x10 to 11x12 ft, roughly 100 to 132 sq ft. A primary bedroom is usually 12x14 ft or more, around 168 sq ft and up. The building code minimum for a habitable room is 70 sq ft with no dimension under 7 ft, which is much smaller than anything built by choice.

Is a 10x10 room big enough?

For a bedroom, yes: 100 sq ft takes a queen bed with about 30 in each side, or a full bed plus a dresser. For a living room it is tight but workable with a loveseat rather than a full sofa. For a dining room seating six it is not, because chair pull out needs 36 in on every side of the table.

How much usable space does a room actually have?

Take off the door swing arc, which is 30 to 36 in of quarter circle per door, and a 30 to 36 in main walkway through the space. On a typical 12x12 room that removes roughly 25 to 35 sq ft before any furniture is placed, so a 144 sq ft room offers about 110 sq ft of real furniture floor.

Does ceiling height count?

Not for square footage, but it decides several real questions: whether a wardrobe or bookcase clears, whether a bunk or loft bed is viable, and how large the room feels. Standard is 8 ft, with 9 to 10 ft in newer construction and often 7.5 ft or less in basements and converted lofts.

ItemFits

About Blog FAQ Features Pricing Work with us

Home / Room Layout & Fit

Room Size Calculator

Get the square footage, then get the number that matters: the floor left once the walkways are taken out.

Trusted across thousands of fit checks · updated daily

400 questions answered

Room Preview·Visual Results·Simulations

Fit summaryFIG. LAYOUT

Whether it fits comes down to the measurements most people skip.

A 168 sq ft room offers roughly 130 sq ft once the swings and walkways come out.

The spaceSecondary bedroom 100 to 132 sq ft. Primary bedroom 168 sq ft and up. Living room 200 to 350 sq ft. Code minimum habitable room 70 sq ft with no dimension under 7 ft

What decides itLength x width, then minus door swing arcs and walkway routes

What to measureEnter the pieces you are placing, or just the room, for the usable floor figure

Measure the item and the narrowest usable space yourself. Small differences in trim, packaging, hardware, and model configuration can change the result. Check your own measurements before you buy or move.

ReferenceMoving Guide Furniture Dimensions

About 10 seconds · no signup

Verdicts compare the supported item orientations against the measurements shown above. See our methodology

10,000+ fit checks run·Last check: a few minutes ago

“Checked 6 items against our new apartment in 10 minutes. Knew exactly what to order.” — New apartment

Measure smart

What to measure.

Four numbers decide nearly every fit check. Get these right and the rest follows.

01Length and width at floor level, taken at the narrowest points. Walls are rarely parallel and the narrow reading is the one furniture meets
02Every alcove, bay and recess separately, then add them, rather than treating an irregular room as one rectangle
03Ceiling height, which turns square footage into volume and decides tall wardrobes, bunk beds and loft beds
04Door and window positions along each wall, since a wall broken by an opening cannot take a full length piece
05Fixed projections: radiators, chimney breasts, boxed pipework and built in cupboards, measured out from the wall face

Don't make these

Common mistakes.

Most “it didn't fit” stories trace back to one of these oversights.

⚠Treating square footage as usable space. A 150 sq ft room loses 15 to 25 sq ft to door swings and walkways before any furniture goes in
⚠Measuring an L shaped room as one rectangle. Split it into two, because furniture scale is set by the leg the piece sits in
⚠Measuring at waist height. Skirting boards, radiators and pipe boxing all narrow the room at floor level, which is where furniture sits
⚠Rounding up to the nearest foot on both dimensions. On a 10x12 room that is up to 2 sq ft of floor you do not have
⚠Using square footage to compare rooms of different shapes. A long narrow 8x18 room and a square 12x12 room are both 144 sq ft and hold completely different furniture

Frequently asked

Questions we keep getting.

How do I calculate room size?
Multiply length by width for square footage. Measure at floor level and at the narrowest point of each run, and for an irregular room split it into rectangles, calculate each, and add them. Square footage tells you the floor you have; it does not tell you what fits, because shape and door position decide that.
01
What is the average bedroom size?
A US secondary bedroom is typically 10x10 to 11x12 ft, roughly 100 to 132 sq ft. A primary bedroom is usually 12x14 ft or more, around 168 sq ft and up. The building code minimum for a habitable room is 70 sq ft with no dimension under 7 ft, which is much smaller than anything built by choice.
02
Is a 10x10 room big enough?
For a bedroom, yes: 100 sq ft takes a queen bed with about 30 in each side, or a full bed plus a dresser. For a living room it is tight but workable with a loveseat rather than a full sofa. For a dining room seating six it is not, because chair pull out needs 36 in on every side of the table.
03
How much usable space does a room actually have?
Take off the door swing arc, which is 30 to 36 in of quarter circle per door, and a 30 to 36 in main walkway through the space. On a typical 12x12 room that removes roughly 25 to 35 sq ft before any furniture is placed, so a 144 sq ft room offers about 110 sq ft of real furniture floor.
04
Does ceiling height count?
Not for square footage, but it decides several real questions: whether a wardrobe or bookcase clears, whether a bunk or loft bed is viable, and how large the room feels. Standard is 8 ft, with 9 to 10 ft in newer construction and often 7.5 ft or less in basements and converted lofts.
05

Related guides

Related item guides & reading.

Complete Guide to Measuring Furniture for a MoveMost people measure width and call it done. Moving requires 6 measurements per item — plus path measurements. Here's the complete measurement protocol.

Related fit checks.

Will a Sofa Fit in My Room?Will a sofa fit and look right in your living room? Enter room and sofa size for clearance to the coffee table, TV viewing distance, walking paths, and scale.Will a Bed Fit in My Room?Check if a bed will fit in your room with proper clearance. Account for walking paths, nightstands, door swings, and closet access.Will Multiple Furniture Pieces Fit?Check if multiple furniture pieces will fit in your room together. Plan bedroom sets, living room layouts, and office setups with clearance checks.Sofa Size for Room CalculatorFree sofa size for room calculator. Get the minimum room size for a sofa, couch or sectional, with the walkway and coffee table clearances that make it work.Will a Desk Fit in My Room?Check if a desk will fit in your home office, bedroom, or studio. Account for chair space, monitor distance, and walking clearances.

All room fit checks →

Unlock stair simulation, AR visualization, and more.

Will it fit? Know before you buy.

Get a verdict in seconds — then test every angle until you’re sure.

Open the fit calculator

ItemFits

About Blog FAQ Features Pricing Work with us

Home / Room Layout & Fit

Room Size Calculator

Get the square footage, then get the number that matters: the floor left once the walkways are taken out.

Trusted across thousands of fit checks · updated daily

400 questions answered

Room Preview·Visual Results·Simulations

Fit summaryFIG. LAYOUT

Whether it fits comes down to the measurements most people skip.

A 168 sq ft room offers roughly 130 sq ft once the swings and walkways come out.

The spaceSecondary bedroom 100 to 132 sq ft. Primary bedroom 168 sq ft and up. Living room 200 to 350 sq ft. Code minimum habitable room 70 sq ft with no dimension under 7 ft

What decides itLength x width, then minus door swing arcs and walkway routes

What to measureEnter the pieces you are placing, or just the room, for the usable floor figure

ReferenceMoving Guide Furniture Dimensions

About 10 seconds · no signup

Verdicts compare the supported item orientations against the measurements shown above. See our methodology

10,000+ fit checks run·Last check: a few minutes ago

“Checked 6 items against our new apartment in 10 minutes. Knew exactly what to order.” — New apartment

Measure smart

What to measure.

Four numbers decide nearly every fit check. Get these right and the rest follows.

01Length and width at floor level, taken at the narrowest points. Walls are rarely parallel and the narrow reading is the one furniture meets
02Every alcove, bay and recess separately, then add them, rather than treating an irregular room as one rectangle
03Ceiling height, which turns square footage into volume and decides tall wardrobes, bunk beds and loft beds
04Door and window positions along each wall, since a wall broken by an opening cannot take a full length piece
05Fixed projections: radiators, chimney breasts, boxed pipework and built in cupboards, measured out from the wall face

Don't make these

Common mistakes.

Most “it didn't fit” stories trace back to one of these oversights.

⚠Treating square footage as usable space. A 150 sq ft room loses 15 to 25 sq ft to door swings and walkways before any furniture goes in
⚠Measuring an L shaped room as one rectangle. Split it into two, because furniture scale is set by the leg the piece sits in
⚠Measuring at waist height. Skirting boards, radiators and pipe boxing all narrow the room at floor level, which is where furniture sits
⚠Rounding up to the nearest foot on both dimensions. On a 10x12 room that is up to 2 sq ft of floor you do not have
⚠Using square footage to compare rooms of different shapes. A long narrow 8x18 room and a square 12x12 room are both 144 sq ft and hold completely different furniture

Frequently asked

Questions we keep getting.

How do I calculate room size?
Multiply length by width for square footage. Measure at floor level and at the narrowest point of each run, and for an irregular room split it into rectangles, calculate each, and add them. Square footage tells you the floor you have; it does not tell you what fits, because shape and door position decide that.
01
What is the average bedroom size?
A US secondary bedroom is typically 10x10 to 11x12 ft, roughly 100 to 132 sq ft. A primary bedroom is usually 12x14 ft or more, around 168 sq ft and up. The building code minimum for a habitable room is 70 sq ft with no dimension under 7 ft, which is much smaller than anything built by choice.
02
Is a 10x10 room big enough?
For a bedroom, yes: 100 sq ft takes a queen bed with about 30 in each side, or a full bed plus a dresser. For a living room it is tight but workable with a loveseat rather than a full sofa. For a dining room seating six it is not, because chair pull out needs 36 in on every side of the table.
03
How much usable space does a room actually have?
Take off the door swing arc, which is 30 to 36 in of quarter circle per door, and a 30 to 36 in main walkway through the space. On a typical 12x12 room that removes roughly 25 to 35 sq ft before any furniture is placed, so a 144 sq ft room offers about 110 sq ft of real furniture floor.
04
Does ceiling height count?
Not for square footage, but it decides several real questions: whether a wardrobe or bookcase clears, whether a bunk or loft bed is viable, and how large the room feels. Standard is 8 ft, with 9 to 10 ft in newer construction and often 7.5 ft or less in basements and converted lofts.
05

Related guides

Related item guides & reading.

Related fit checks.

All room fit checks →

Unlock stair simulation, AR visualization, and more.

Will it fit? Know before you buy.

Get a verdict in seconds — then test every angle until you’re sure.

Open the fit calculator