Square Footage Calculator

Calculate area for any space

Total Square Footage

444.0

Rooms

sq m

41.25

Units

Length (ft)

Width (ft)

Area300.00 sq ft

Length (ft)

Width (ft)

Area144.00 sq ft

Room Comparison

Living Room300.0 sq ft

Bedroom144.0 sq ft

Room Breakdown

Living Room300.00 sq ft

Bedroom144.00 sq ft

Total in sq m

41.25

444.00 sq ft = 41.25 sq m

Rooms

Avg Room Size

222

sq ft

Frequently Asked Questions

How do I calculate square footage of a room?

Length (ft) × Width (ft) = Square feet. For a 12×15 room: 12 × 15 = 180 sq ft. For irregular rooms, divide into rectangles, calculate each, then add together. Always measure to the nearest inch for accuracy.

Rectangle: Length × Width
Circle: π × radius² (3.14 × r²)
Triangle: ½ × base × height
Irregular: Divide into simple shapes, add together
Measure in feet, convert inches to decimals

Room Size	Square Feet	Common Room Type
10×10	100 sq ft	Small bedroom
12×12	144 sq ft	Standard bedroom
12×15	180 sq ft	Master bedroom
15×20	300 sq ft	Living room
10×12	120 sq ft	Home office

How do I convert square feet to other units?

Sq ft to sq meters: × 0.0929. Sq ft to sq yards: ÷ 9. Sq ft to acres: ÷ 43,560. Common uses: Real estate uses sq ft, carpet uses sq yards, land uses acres.

1 sq yard = 9 sq ft (carpet industry)
1 acre = 43,560 sq ft (land/real estate)
1 sq meter = 10.764 sq ft (international)
Hectare = 2.471 acres = 107,639 sq ft

From	To	Formula	Example
Sq ft	Sq meters	× 0.0929	100 sq ft = 9.29 sq m
Sq ft	Sq yards	÷ 9	180 sq ft = 20 sq yd
Sq ft	Acres	÷ 43,560	21,780 sq ft = 0.5 acre
Sq meters	Sq ft	× 10.764	50 sq m = 538 sq ft

What is the average square footage by home type?

Average US home: 2,300 sq ft. Studio apartment: 400-600 sq ft. 1-bedroom: 700-900 sq ft. 2-bedroom: 900-1,200 sq ft. 3-bedroom house: 1,500-2,200 sq ft. McMansion: 3,500+ sq ft.

Average US home has grown 50% since 1970
NYC average: 866 sq ft
Suburban average: 2,500+ sq ft
Tiny homes: 100-400 sq ft

Home Type	Typical Size	Notes
Studio apartment	400-600 sq ft	No separate bedroom
1-bed apartment	700-900 sq ft	City average
2-bed apartment	900-1,200 sq ft	Common rental
3-bed house	1,500-2,200 sq ft	Average family home
4-bed house	2,200-3,000 sq ft	Larger family
McMansion	3,500+ sq ft	New construction

How do I calculate square footage for flooring?

Measure room length × width for each room. Add all rooms together. Add 10-15% for waste/cuts. Flooring is sold by sq ft or box (usually 20-25 sq ft per box). Round up to full boxes.

Measure each room separately
Include closets if flooring them
Add 10% waste for simple rooms
Add 15% for diagonal or complex patterns
Add 5% more to keep for repairs
Flooring boxes: Usually 20-25 sq ft each

Room Sq Ft	+10% Waste	+15% Waste	Boxes (20 sq ft)
100	110	115	6 boxes
200	220	230	12 boxes
500	550	575	29 boxes

How do I measure wall square footage for paint?

Wall area = Perimeter × Height. Perimeter = 2×(Length + Width). For a 12×15 room with 8ft ceilings: Perimeter = 54 ft. Wall area = 54 × 8 = 432 sq ft. Subtract 20 sq ft per door, 15 per window.

Perimeter = 2 × (Length + Width)
Wall area = Perimeter × Ceiling height
Subtract: 20 sq ft per door
Subtract: 15 sq ft per window
One gallon covers 350-400 sq ft
Most rooms need 2 coats

How is square footage calculated for real estate?

Real estate uses Gross Living Area (GLA): All heated/cooled living space. Includes: Bedrooms, bathrooms, living areas, hallways, closets. Excludes: Garage, unfinished basement, porches, patios. Measured exterior wall to exterior wall.

GLA = Gross Living Area (heated/finished)
Measure exterior walls (includes wall thickness)
Include: Finished basement (sometimes discounted)
Exclude: Garage, unfinished areas, porches
Appraisers use ANSI standards
Second story with lower ceiling: May be discounted

Example Calculations

1Two-Room Home (Living Room + Bedroom)

Inputs

Living Room20 × 15 ft (rectangle)

Bedroom12 × 12 ft (rectangle)

Result

Total Square Footage444.00 sq ft

Living Room Area300.00 sq ft

Bedroom Area144.00 sq ft

Living room = 20 × 15 = 300 sq ft. Bedroom = 12 × 12 = 144 sq ft. Total = 300 + 144 = 444.00 sq ft.

2Mixed Shapes (Rectangle + Circular Area)

Inputs

Main Room18 × 14 ft (rectangle)

Turret/NookRadius 5 ft (circle)

Result

Total Square Footage330.54 sq ft

Main Room Area252.00 sq ft

Turret/Nook Area78.54 sq ft

Main room = 18 × 14 = 252 sq ft. Circular nook = pi × 5² = 3.14159 × 25 = 78.54 sq ft. Total = 252 + 78.54 = 330.54 sq ft.

Formulas Used

Rectangle Area

Area = Length × Width

Standard area formula for rectangular rooms.

Where:

Length= Room length (ft or m)

Width= Room width (ft or m)

Circle Area

Area = pi × Radius²

Area of a circular space.

Where:

pi= 3.14159...

Radius= Distance from center to edge (ft or m)

Triangle Area

Area = (Base × Height) / 2

Area of a triangular space.

Where:

Base= Length of the base (ft or m)

Height= Perpendicular height (ft or m)

Understanding Square Footage

Square footage is a standard measurement for real estate, construction, and interior design.

Accurate measurements help you estimate materials, compare property values, and plan renovations.

When measuring, always use the same units throughout and double-check your calculations.

Related Resources

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Last Updated: Feb 12, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

UseCalcPro

Square Footage Calculator

Calculate area for any space

Total Square Footage

444.0

Rooms

sq m

41.25

Units

Length (ft)

Width (ft)

Area300.00 sq ft

Length (ft)

Width (ft)

Area144.00 sq ft

Room Comparison

Living Room300.0 sq ft

Bedroom144.0 sq ft

Room Breakdown

Living Room300.00 sq ft

Bedroom144.00 sq ft

Total in sq m

41.25

444.00 sq ft = 41.25 sq m

Rooms

Avg Room Size

222

sq ft

Frequently Asked Questions

How do I calculate square footage of a room?

Rectangle: Length × Width
Circle: π × radius² (3.14 × r²)
Triangle: ½ × base × height
Irregular: Divide into simple shapes, add together
Measure in feet, convert inches to decimals

Room Size	Square Feet	Common Room Type
10×10	100 sq ft	Small bedroom
12×12	144 sq ft	Standard bedroom
12×15	180 sq ft	Master bedroom
15×20	300 sq ft	Living room
10×12	120 sq ft	Home office

How do I convert square feet to other units?

Sq ft to sq meters: × 0.0929. Sq ft to sq yards: ÷ 9. Sq ft to acres: ÷ 43,560. Common uses: Real estate uses sq ft, carpet uses sq yards, land uses acres.

1 sq yard = 9 sq ft (carpet industry)
1 acre = 43,560 sq ft (land/real estate)
1 sq meter = 10.764 sq ft (international)
Hectare = 2.471 acres = 107,639 sq ft

From	To	Formula	Example
Sq ft	Sq meters	× 0.0929	100 sq ft = 9.29 sq m
Sq ft	Sq yards	÷ 9	180 sq ft = 20 sq yd
Sq ft	Acres	÷ 43,560	21,780 sq ft = 0.5 acre
Sq meters	Sq ft	× 10.764	50 sq m = 538 sq ft

What is the average square footage by home type?

Average US home: 2,300 sq ft. Studio apartment: 400-600 sq ft. 1-bedroom: 700-900 sq ft. 2-bedroom: 900-1,200 sq ft. 3-bedroom house: 1,500-2,200 sq ft. McMansion: 3,500+ sq ft.

Average US home has grown 50% since 1970
NYC average: 866 sq ft
Suburban average: 2,500+ sq ft
Tiny homes: 100-400 sq ft

Home Type	Typical Size	Notes
Studio apartment	400-600 sq ft	No separate bedroom
1-bed apartment	700-900 sq ft	City average
2-bed apartment	900-1,200 sq ft	Common rental
3-bed house	1,500-2,200 sq ft	Average family home
4-bed house	2,200-3,000 sq ft	Larger family
McMansion	3,500+ sq ft	New construction

How do I calculate square footage for flooring?

Measure room length × width for each room. Add all rooms together. Add 10-15% for waste/cuts. Flooring is sold by sq ft or box (usually 20-25 sq ft per box). Round up to full boxes.

Measure each room separately
Include closets if flooring them
Add 10% waste for simple rooms
Add 15% for diagonal or complex patterns
Add 5% more to keep for repairs
Flooring boxes: Usually 20-25 sq ft each

Room Sq Ft	+10% Waste	+15% Waste	Boxes (20 sq ft)
100	110	115	6 boxes
200	220	230	12 boxes
500	550	575	29 boxes

How do I measure wall square footage for paint?

Wall area = Perimeter × Height. Perimeter = 2×(Length + Width). For a 12×15 room with 8ft ceilings: Perimeter = 54 ft. Wall area = 54 × 8 = 432 sq ft. Subtract 20 sq ft per door, 15 per window.

Perimeter = 2 × (Length + Width)
Wall area = Perimeter × Ceiling height
Subtract: 20 sq ft per door
Subtract: 15 sq ft per window
One gallon covers 350-400 sq ft
Most rooms need 2 coats

How is square footage calculated for real estate?

GLA = Gross Living Area (heated/finished)
Measure exterior walls (includes wall thickness)
Include: Finished basement (sometimes discounted)
Exclude: Garage, unfinished areas, porches
Appraisers use ANSI standards
Second story with lower ceiling: May be discounted

Example Calculations

1Two-Room Home (Living Room + Bedroom)

Inputs

Living Room20 × 15 ft (rectangle)

Bedroom12 × 12 ft (rectangle)

Result

Total Square Footage444.00 sq ft

Living Room Area300.00 sq ft

Bedroom Area144.00 sq ft

Living room = 20 × 15 = 300 sq ft. Bedroom = 12 × 12 = 144 sq ft. Total = 300 + 144 = 444.00 sq ft.

2Mixed Shapes (Rectangle + Circular Area)

Inputs

Main Room18 × 14 ft (rectangle)

Turret/NookRadius 5 ft (circle)

Result

Total Square Footage330.54 sq ft

Main Room Area252.00 sq ft

Turret/Nook Area78.54 sq ft

Main room = 18 × 14 = 252 sq ft. Circular nook = pi × 5² = 3.14159 × 25 = 78.54 sq ft. Total = 252 + 78.54 = 330.54 sq ft.

Formulas Used

Rectangle Area

Area = Length × Width

Standard area formula for rectangular rooms.

Where:

Length= Room length (ft or m)

Width= Room width (ft or m)

Circle Area

Area = pi × Radius²

Area of a circular space.

Where:

pi= 3.14159...

Radius= Distance from center to edge (ft or m)

Triangle Area

Area = (Base × Height) / 2

Area of a triangular space.

Where:

Base= Length of the base (ft or m)

Height= Perpendicular height (ft or m)

Understanding Square Footage

Square footage is a standard measurement for real estate, construction, and interior design.

Accurate measurements help you estimate materials, compare property values, and plan renovations.

When measuring, always use the same units throughout and double-check your calculations.

Related Resources

Related Calculators

Paint Calculator

Calculate paint needed

Tile Calculator

Calculate tiles needed

More Construction Calculators

Plan your building projects

View All

Last Updated: Feb 12, 2026