The Floor Area Calculator calculates the square footage of a floor by multiplying its length by its width.
You can enter measurements in feet and inches (for example 15 ft 6 in × 12 ft 3 in) and the calculator converts them before multiplying. It shows the result in square feet, square meters and square yards, and has an L-shaped mode that adds two rectangular sections.
Floor Area Calculator
Floor square footage for rectangular and L-shaped floors, in feet and inches or metres.
Formula
- Rectangle: A = L × W
- Feet and inches: A = (ft₁ + in₁ ÷ 12) × (ft₂ + in₂ ÷ 12)
- L-shape: A = L₁ × W₁ + L₂ × W₂ (non-overlapping sections)
How the Calculation Works
Step 1: Convert inches to decimal feet by dividing by 12.
Step 2: Multiply length by width.
Step 3: For an L-shaped floor, split it into two rectangles that don’t overlap and add them.
Variables Explained
| Input | Meaning |
|---|---|
| Length, width | Wall-to-wall room dimensions |
| Section 1 and 2 | The two rectangles that make up an L-shaped floor |
Example Calculation
Feet and inches
Given: 15 ft 6 in × 12 ft 3 in
Decimal: 15.5 ft × 12.25 ft
Result: A = 189.875 ft² (≈ 17.64 m²)
L-shaped floor
Given: 15 × 12 ft main section and an 8 × 6 ft alcove
Result: 180 + 48 = 228 ft²
Common Area Conversion Table
| Unit | Equivalent |
|---|---|
| 1 m² | 10.7639 ft² |
| 1 yd² | 9 ft² |
| 1 ft² | 0.0929 m² |
| 6 in | 0.5 ft |
| 3 in | 0.25 ft |
Dimensions Explained
Measuring a room
Measure wall to wall at floor level, at the widest points. Include closets and alcoves if the flooring will go into them.
Irregular rooms
For rooms with angled walls or curves, use the Odd-Shaped Room Square Footage Calculator or split the room into shapes you can measure.
Material Estimation Notes
Floor area is the starting point for flooring, but you usually buy more to cover cuts and waste. Use the Floor, Tile, Laminate or Vinyl calculators to turn area into boxes.
Frequently Asked Questions
How do I calculate the square footage of a floor?
Multiply the length by the width in feet.
How do I calculate square feet with inches?
Divide the inches by 12, add them to the feet, then multiply.
How do I convert square feet to square meters?
Divide by 10.7639, or switch the result unit.
How do I measure an L-shaped room?
Split it into two rectangles and add their areas.
Is floor area the same as living area?
Not always — official living area follows specific measurement rules. This calculator gives the area you measure.