The Room Square Footage Calculator finds the area of a room when your tape measure reads feet and inches (like 14 ft 6 in × 11 ft 9 in), for a simple length × width, or for several rooms added together.
Inches are converted to decimal feet (inches ÷ 12) before multiplying. Results are shown in square feet, square meters and — for feet-and-inches entries — square yards, which carpet is often sold in.
Room Square Footage Calculator
Square footage of a room in feet and inches, or of several rooms added together.
Formula
Length (ft) = feet + inches ÷ 12
Square footage = length × width
Total for several rooms = L₁ × W₁ + L₂ × W₂ + …
Conversions: 1 ft² = 0.092903 m²; 1 yd² = 9 ft².
How the Calculation Works
Step 1: Convert inches to a fraction of a foot.
Step 2: Multiply length × width.
Step 3: For a whole home or floor, add each room’s area.
Example Calculation
Feet and inches
Given: 14 ft 6 in × 11 ft 9 in
14.5 × 11.75 = 170.375 ft² ≈ 15.83 m² ≈ 18.93 yd²
Several rooms
Given: 14 × 12, 12 × 10 and 10 × 9 ft
168 + 120 + 90 = 378 ft²
Inches to Decimal Feet
| Inches | Feet | Inches | Feet |
|---|---|---|---|
| 1 | 0.083 | 7 | 0.583 |
| 2 | 0.167 | 8 | 0.667 |
| 3 | 0.25 | 9 | 0.75 |
| 4 | 0.333 | 10 | 0.833 |
| 5 | 0.417 | 11 | 0.917 |
| 6 | 0.5 | 12 | 1 |
Dimensions Explained
- Measure wall to wall at floor level; include closets if you are ordering flooring for them.
- Irregular rooms: divide into rectangles and use the several-rooms tab to add them.
- Listed home square footage follows local measurement standards and may differ from a room-by-room total.
Frequently Asked Questions
How do I calculate square feet with inches?
Divide the inches by 12, add to the feet, then multiply length × width.
What is 12 ft 6 in × 10 ft 3 in in square feet?
12.5 × 10.25 = 128.125 ft².
How do I add up square footage of multiple rooms?
Calculate each room separately and add the areas.
How do I convert square feet to square yards?
Divide by 9.
How do I convert square feet to square meters?
Multiply by 0.0929.
