Square Footage Calculator

Sq to ft Converter: Simple Area Measurement Tool

A square footage calculator is a handy tool used to quickly determine the area of any flat surface, usually in square feet. The basic formula is easy: multiply the length by the width of the surface, assuming measurements are in feet.

Square Footage= Length (ft)×Width (ft)

This calculation helps homeowners, contractors, and DIYers estimate areas for flooring, painting, carpeting, or landscaping projects accurately.

For irregular shapes like L-shaped rooms or multiple sections, break the area into smaller rectangles and sum the calculated square footages for each part. Measurements in inches or other units can be converted to feet before calculating.

What Is Square Footage?

Square footage (ft²) is a unit of area in the US customary system, representing the space within a two-dimensional shape (e.g., a room, wall, or yard). One square foot equals the area of a square with 1-foot sides (1 ft × 1 ft), approximately 0.0929 square meters (m²). It’s used for:

• Real Estate: Determining house or room sizes.

• Construction: Estimating materials for flooring, tiling, painting, or roofing.

• Landscaping: Measuring lawns, pools, or concrete areas.

Note: “1 square feet inch” is a misnomer; square feet is an area unit, not linear. For measurements involving inches, convert to feet (e.g., 12 inches = 1 foot).

How to Calculate Square Footage

To Cubic Feet Calculator, measure the length and width of the area in feet (or convert inches to feet) and multiply. For three-dimensional spaces (e.g., rooms with height), square footage typically refers to floor or wall area, not volume. Here’s the step-by-step process, addressing terms like “how to calculate sq ft” or “square footage calculator feet and inches”:

Measure Dimensions:

• Use a tape measure or laser measurer for accuracy.
• For rectangular areas: Measure length and width in feet.
• If measurements include inches, convert to decimal feet (e.g., 6 inches = 0.5 ft, 1 inch = 0.08333 ft).
• Example: A room 12 ft 6 in long = 12 + 6 ÷ 12 = 12.5 ft.

Calculate Area:

• Formula: Area (ft²) = Length (ft) × Width (ft).
• For irregular shapes: Divide into rectangles, triangles, or circles, calculate each area, and sum them.
• Triangle: Area = 0.5 × Base × Height.
• Circle: Area = π × Radius² (π ≈ 3.14159).
• Example: A 12 ft × 10 ft room = 12 × 10 = 120 ft².

Adjust for Specific Surfaces:

• Walls: Measure height and width of each wall; sum areas for total wall square footage.
• Roofs: Measure ground area and adjust for pitch (e.g., multiply by 1.2 for a 6/12 pitch).
• Yards/Pools: Measure surface area, ignoring depth unless calculating volume.

Account for Waste:

• For flooring, tiling, or wallpaper, add 5–15% for cuts and errors.
• Example: 120 ft² flooring + 10% = 132 ft² needed

Square Footage Formulas

• Rectangle/Square: Area (ft²) = Length (ft) × Width (ft).

• Triangle: Area (ft²) = 0.5 × Base (ft) × Height (ft).

• Circle: Area (ft²) = π × Radius² (ft).

• Feet and Inches to Decimal Feet: Feet = Whole Feet + (Inches ÷ 12).

• Per Square Foot Cost: Cost = Area (ft²) × Cost per ft².

Example: A 12 ft 6 in × 10 ft 3 in room:

• Convert: 12 ft 6 in = 12.5 ft, 10 ft 3 in = 10.25 ft.

• Area = 12.5 × 10.25 = 128.125 ft².

Square Footage Conversion Chart

This chart provides common area calculations, addressing terms like “square footage calculator for flooring” or “yard square footage calculator”:

Specific Square Footage Calculations

How to Calculate Square Feet of a Room

• Measure length and width of the floor.

• Example: A 12 × 12 ft room = 144 ft².

• For irregular rooms: Divide into shapes, calculate each, and sum (e.g., L-shaped room = rectangle + rectangle).

How to Calculate Square Feet of a House

• Sum the floor area of all rooms (excluding walls unless specified).

• For multi-story homes: Calculate each floor separately and add.

• Example: Living room (200 ft²) + Kitchen (150 ft²) + 2 bedrooms (120 ft² each) = 590 ft² per floor.

How to Calculate Square Feet of a Wall

• Measure height and width of each wall.

• Area = Height (ft) × Width (ft).

• Subtract openings (doors, windows): Measure and subtract their area.

• Example: A 10 ft × 8 ft wall with a 3 ft × 7 ft window = (10 × 8) – (3 × 7) = 80 – 21 = 59 ft².

Square Footage for Flooring

• Measure floor area; add 5–10% for waste.

• Example: 200 ft² room + 10% = 220 ft² of flooring needed.

Square Footage for Tiles

• Measure floor or wall area; add 10–15% for cuts and breakage.

• Example: 100 ft² bathroom floor + 15% = 115 ft² of tiles.

Square Footage for Paint

• Measure wall areas; subtract openings. Typically, 1 gallon covers 350–400 ft² (one coat).

• Example: 400 ft² of walls ÷ 350 ft²/gallon ≈ 1.14 gallons/coat.

Square Footage for Wallpaper

• Measure wall areas; add 10% for pattern matching.

• Example: 300 ft² walls + 10% = 330 ft² of wallpaper.

Roof Square Footage Calculator

• Measure ground area of the house, then adjust for roof pitch (e.g., multiply by 1.2 for a 6/12 pitch).

• Example: 1000 ft² ground area × 1.2 = 1200 ft² roof area.

Yard and Lawn Square Footage Calculator

• Measure length and width of outdoor areas.

• Example: A 50 ft × 30 ft lawn = 1500 ft².

Concrete Square Footage Calculator

• Measure surface area for slabs; add 5–10% for overage.

• Example: 20 ft × 20 ft patio = 400 ft² + 10% = 440 ft².

Pool Square Footage Calculator

• Measure surface area of the pool’s top surface (not volume).

• Example: A 20 ft × 10 ft rectangular pool = 200 ft².

Specific Examples

How Many Sq Ft Is 12×12 Feet?

12 × 12 = 144 ft².

What Is 20×20 in Sq Ft?

20 × 20 = 400 ft².

10 Feet to Square Feet

A linear measurement (10 ft) cannot directly convert to square feet without a second dimension. If it’s a square (10 ft × 10 ft), then 10 × 10 = 100 ft².

How to Calculate Per Sq Ft?

• Cost per ft² = Total Cost ÷ Area (ft²).

• Example: $1000 for 200 ft² flooring = $1000 ÷ 200 = $5/ft².

How to Calculate Square Feet from Length, Width, and Height

• For area (e.g., floor, wall): Use only length and width.

• Height is used for volume (cu ft) or wall area. Example: A room 12 ft long, 10 ft wide, 8 ft high has a floor area of 12 × 10 = 120 ft², and wall area of (12 + 10) × 2 × 8 = 352 ft² (excluding openings).

FAQs

How do I calculate sq ft?

Measure length and width in feet, then multiply: Area (ft²) = Length × Width. For inches, convert to decimal feet (e.g., 6 in = 0.5 ft).

How many sq ft is 12×12 feet?

12 × 12 = 144 ft².

How to calculate per sq ft?

Divide total cost by area: Cost per ft² = Total Cost ÷ Area (ft²). Example: $500 for 100 ft² = $5/ft².

What is 20×20 in sq ft?

20 × 20 = 400 ft².

Calculating square footage is straightforward with the formula Area (ft²) = Length × Width, adaptable for rooms, walls, houses, roofs, or yards. This guide provides precise calculations for examples like 12×12 ft (144 ft²) or 20×20 ft (400 ft²), and supports applications like flooring, tiling, painting, and landscaping. Use online calculators, apps, or Google Maps for convenience, and add 5–15% for waste in material estimates to ensure accurate planning for 2025 projects.