Square Foot Calculator Room
Calculate the square footage of any room. Enter room length and width, add closets and alcoves, and get the total area in square feet.
Room Area Calculator
Enter the main room dimensions, plus an optional closet or alcove.
Main Room
Closet / Alcove (optional)
How to Calculate Square Footage of a Room
Knowing your room's square footage is essential for buying flooring, estimating paint, sizing furniture, and understanding your living space. Most rooms are rectangular, making the calculation straightforward.
Room Area Formula
Step-by-Step Instructions
- Clear the room — move furniture away from walls for accurate measurements.
- Measure the length — the longest wall, from corner to corner.
- Measure the width — the wall perpendicular to the length.
- Measure closets separately — length × width of each closet or alcove.
- Add all areas together for the total room square footage.
Example Calculation
Main room: 16 ft × 12 ft = 192 sq ft
Walk-in closet: 6 ft × 4 ft = 24 sq ft
192 + 24 = 216 square feet (20.07 sq m)
What to Include
- ✅ Main floor area wall-to-wall
- ✅ Closets and built-in wardrobes
- ✅ Bay windows and alcoves
- ❌ Do NOT include wall thickness
- ❌ Do NOT include areas under permanent fixtures
Frequently Asked Questions
How do I calculate the square footage of a room? +
Measure the room's length and width in feet from wall to wall. Multiply length × width. Add closet areas separately.
Should I include closets in room square footage? +
Yes, closets with floors should be measured and added to the room's main area for total square footage.
How do I measure a room that isn't rectangular? +
Split the room into rectangular sections, calculate each area separately, and add them together.
What is the average bedroom size in square feet? +
A standard bedroom is typically 120-180 sq ft (10×12 to 12×15 ft). A master bedroom averages 200-350 sq ft.
Do I measure from inside the walls or outside? +
Always measure from the inside surfaces of the walls — this gives you the usable floor area.