Square Footage Calculator
Calculate room and area square footage accurately for flooring, painting, and construction projects. Free, fast, and precise measurements for any space.
Calculate Square Footage
Formula Used
Multiply the length by the width to get the total square footage. Works for rectangles and squares.
Enter dimensions to calculate square footage
What is Square Footage?
Square footage (also called square feet or sq ft) is a unit of area measurement commonly used in the United States and other countries. It represents the area of a square with sides that are exactly one foot long.
Understanding square footage is essential for numerous applications including:
- Real Estate: Property size, room dimensions, and home valuation
- Construction: Material estimation, cost calculation, and project planning
- Interior Design: Furniture placement, space planning, and decorating
- Flooring & Painting: Determining material quantities needed
- HVAC: Calculating heating and cooling requirements
How to Calculate Square Footage
Step-by-Step Process
- 1Measure the Length
Use a tape measure to measure the longest side of the room in feet.
- 2Measure the Width
Measure the perpendicular side in feet.
- 3Multiply
Length × Width = Square Footage
- 4Add Multiple Rooms
Calculate each room separately and sum for total area.
Common Conversions
Frequently Asked Questions
How do I measure an irregularly shaped room?
Break the room into smaller rectangles, triangles, or circles. Calculate the square footage of each section separately, then add them together for the total area. For very irregular shapes, consider hiring a professional surveyor.
Should I include closets in square footage?
Yes, closets are typically included in a room’s square footage if they’re accessible from the room and have standard ceiling height. Walk-in closets are definitely included.
How much extra material should I buy?
Always add 10-15% extra for waste, cuts, and mistakes. For patterned materials like tile or patterned carpet, add 15-20% extra to account for pattern matching.
What’s the difference between square feet and cubic feet?
Square feet measures area (length × width) in two dimensions, while cubic feet measures volume (length × width × height) in three dimensions. Use square feet for floor area, cubic feet for room volume or storage capacity.
How accurate do my measurements need to be?
For general estimates, measuring to the nearest inch is sufficient. For precise material orders or construction, measure to 1/8th inch accuracy. Use a quality tape measure and have someone help for best results.
Can I calculate square footage for outdoor spaces?
Absolutely! This calculator works for any flat surface including patios, decks, driveways, lawns, and gardens. Just measure in feet and calculate the same way.
What Our Users Say
“This calculator saved me so much time! I was able to order the exact amount of flooring I needed without over-buying. Super accurate and easy to use.”
“As a contractor, I use this daily. The multiple unit conversions are incredibly helpful, and the material estimates give clients instant quotes. Highly recommend!”
“Perfect for my interior design business. I can quickly calculate room sizes and material needs during client consultations. The interface is beautiful too!”
Similar Calculators
More tools in the same category
Board and Batten Layout Calculator
Calculate board and batten spacing for perfect layouts
Feet and Inches Calculator
Add, subtract, and convert feet and inches measurements
Scale Calculator
Convert between different measurement scales for plans
Lumber Weight Calculator
Calculate lumber weight from species, dimensions and quantity. 17+ wood species, kiln-dried/green/pressure-treated moisture.
Cabinet Door Size Calculator
Calculate cabinet door dimensions for full overlay, partial overlay, or inset construction. Auto hinge count.
Wainscoting Calculator
Calculate panels, beadboard, board-and-batten, raised wainscoting + trim materials for any room.
Often Used Together
Complementary tools for complete analysis
From Other Categories
Expand your calculations
Geometry and area calculations for building
Measurement unit conversions
Project cost and budget calculations
Related Articles
Dive deeper with our expert guides and tutorials related to Square Footage Calculator