Square Footage Calculator
Calculate room or project area using Imperial or Metric dimensions.
Calculate the area of a room, house or multi-section project using feet or meters. Imperial mode makes square feet the primary result and includes square yards and square meters; Metric mode makes square meters primary and includes converted square feet.
Your Estimate
Total Square Feet
120.0 ft²
Square Yards
13.3 yd²
Square Meters
11.1 m²
Area equals length × width × number of identical sections. One square yard equals 9 square feet, and one square meter equals 10.7639 square feet.
Results Actions
For irregular spaces, divide the layout into rectangles, calculate each area separately and add the results together.
Common Area Conversions
Keep length and width in the same unit before multiplying. Converted results are rounded for display.
How to Use the Square Footage Calculator
- 1Choose Imperial or Metric units.
- 2Enter length and width in feet or meters.
- 3Enter the number of identical rooms or sections.
- 4Review the primary area and secondary converted results.
- 5For irregular spaces, calculate smaller rectangles separately and add their areas.
Square Footage and Area Formulas
- 1Area of one rectangle = length × width.
- 2Total area = area of one rectangle × number of identical rooms or sections.
- 3Imperial square yards = square feet ÷ 9.
- 4Imperial square meters = square feet ÷ 10.7639.
- 5Metric square feet = square meters × 10.7639.
Example Calculation
Imperial example: a 12 ft × 10 ft room has 12 × 10 = 120 sq ft, which is 13.3 sq yd or about 11.1 m². Metric example: a 4 m × 3 m room has 4 × 3 = 12 m², which is about 129.2 sq ft. For multiple identical rooms, multiply these areas by the room count.
Accuracy & Assumptions
- Results depend on the accuracy of the entered dimensions.
- Length and width must use the same measurement system.
- Imperial mode uses feet as inputs; Metric mode uses meters.
- One square meter equals 10.7639 square feet and one square yard equals 9 square feet.
- Actual usable area may vary due to walls, closets or irregular room shapes.
- Irregular spaces should be divided into smaller rectangles and added together.
- Verify all measurements on site before ordering flooring or other materials.
- Check supplier packaging and pricing units before purchasing.
Frequently Asked Questions
How do I calculate square footage?
Measure length and width in feet, then multiply them. For example, 12 ft × 10 ft = 120 sq ft.
How do I calculate square meters?
Measure length and width in meters, then multiply them. For example, 4 m × 3 m = 12 m².
How do I convert square meters to square feet?
Multiply square meters by 10.7639. The calculator performs this conversion automatically in Metric mode.
How do I convert square feet to square yards?
Divide square feet by 9. The calculator shows square yards as a secondary result in Imperial mode.
How do I measure an irregular room?
Divide the room into smaller rectangles, calculate length × width for each rectangle and add all of the areas together.
Should closets and alcoves be included?
Include every space that will receive the material you are estimating. Measure closets, alcoves and other sections separately when their shapes differ.
Can I calculate multiple identical rooms?
Yes. Enter the number of identical rooms or sections and the calculator multiplies the single-room area by that count.
This calculator provides an area estimate based on the dimensions entered. Measure irregular spaces as separate rectangles, verify all dimensions on site and confirm whether product coverage or pricing uses square feet, square yards or square meters before purchasing.