Square Footage Calculator – Calculate Room Area in Sq Ft
Calculate square footage of any room, floor, or outdoor space. Supports rectangles, triangles, and circles. Converts to square meters, yards, and acres instantly.
📏 Home📐 Area = Length x Width (rectangle)
Length (feet)
Width (feet)
Shape
Please enter valid values.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| Square Footage Calculator – Calculate Room Area in Sq Ft | Area = Length x Width (rectangle) | sq ft |
Step-by-Step Examples
Example 1
Standard Bedroom
15 x 12 ft, rectangle.
- Area: 180 sq ft | 16.7 sq meters
✓ 180 sq ft
Example 2
Triangular Deck
24 ft base, 16 ft height.
- 0.5 x 24 x 16 = 192 sq ft
✓ 192 sq ft
Example 3
Round Pool
18 ft diameter circle.
- PI x 9 sq = 254.5 sq ft
✓ 254.5 sq ft
Real-World Applications
Homeowners
Calculate room area for flooring and renovation.
Real Estate
Verify square footage listings.
Contractors
Fast area calculation for material estimates.
Buyers and Renters
Understand space before committing.
Common Mistakes to Avoid
⚠️
Not measuring to walls
Measure to interior wall surfaces — remove furniture.
⚠️
Basement and garage inclusion
Typically excluded from finished square footage.
Frequently Asked Questions
How to calculate square footage? ▾
Multiply length by width in feet. For L-shaped rooms, split into rectangles and add each area.
Square footage vs square meters? ▾
1 sq ft = 0.0929 sq meters. 1 sq meter = 10.764 sq ft.
How is home sq footage measured? ▾
From exterior walls for above-grade finished space. Unfinished basements and garages typically excluded.
Sq ft per person average? ▾
US average: 2,300 sq ft for 2.5 people. NYC minimum: 400 sq ft. Tiny house: 100-400 sq ft.