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Tool: Square Footage Calculator — Rooms, Slabs & Multi-Area | Printed on:
Square Footage Calculator — Rooms, Slabs & Multi-Area
Calculate square footage and square meters for rectangles, triangles, circles, and multi-room floorplans.
Project Specifications
Multi-Shape Area Formulas
Transparent mathematical methodology explained in plain English.
Rectangle = L × W | Triangle = 0.5 × B × H | Circle = π × r² Calculate individual geometric sections and sum them together to find total project square footage.
Variables Explained:
- Square Meters: 1 square meter = 10.7639 square feet.
L-Shaped Room: 15×12 Section + 8×10 Section
Dividing an irregular room into two manageable rectangles.
- Area of Section 1: 15 × 12 = 180 sq ft.
- Area of Section 2: 8 × 10 = 80 sq ft.
- Net square footage: 180 + 80 = 260 sq ft.
- In square meters: 260 × 0.0929 = 24.15 sq meters.
- With 10% waste buffer: 260 × 1.10 = 286 sq ft.
Frequently Asked Questions: Square Footage Calculator
Click any question below to expand quick answers, formulas, and expert tips.
How do you calculate the square footage of a room?
Measure the length and width of the room in feet using a tape measure, then multiply the two numbers together (Length × Width = Square Footage). For example, a 12 ft × 15 ft room equals 180 square feet.
How do you calculate the square footage of an irregular or L-shaped room?
Divide the irregular floor plan into separate simple shapes (rectangles, triangles, or half-circles). Calculate the area of each shape independently, then sum them together to find the total square footage.
How do you convert square feet to square meters (and vice versa)?
To convert square feet to square meters, divide by 10.7639 (or multiply by 0.0929). To convert square meters to square feet, multiply by 10.7639. For example, 500 sq ft ÷ 10.7639 = 46.45 sq meters.
How do you find the square footage of a circle or triangle?
For a triangle, multiply base × height ÷ 2. For a circle, square the radius (half the diameter) and multiply by Pi (3.14159). For example, a 12-foot diameter circular patio has a 6-foot radius: 3.14159 × 6² = 113.1 square feet.
How do I measure wall square footage for painting or wallpaper?
Measure the perimeter of the room (sum of all wall lengths) and multiply by ceiling height. Then calculate and subtract the area of doors (21 sq ft each) and windows (15 sq ft each) to find net paintable wall square footage.
What is the difference between gross living area and total square footage?
Gross Living Area (GLA) includes finished, heated, and livable above-grade square footage. Total square footage often includes unfinished basements, attached garages, exterior porches, and utility storage spaces.
How many square feet are in an acre of land?
There are exactly 43,560 square feet in one acre. A standard 0.25-acre suburban residential lot measures approximately 10,890 square feet.
Why is measuring square footage important for real estate and home appraisals?
Square footage directly drives property valuations, price per square foot comparisons ($/sq ft), municipal property tax assessments, and material takeoff orders for home renovation contractors.