Square Footage Calculator

Calculate square footage for rooms, floors, walls, and yards. Convert between square feet, square meters, and acres with accurate area calculations.

Calculator Inputs
Your Results

Enter your values and click Calculate to see results

Accurate Area Calculations

Multiple Shapes

Calculate area for rectangles, circles, and triangles with precise formulas.

Unit Conversions

Instantly convert between square feet, meters, yards, and acres.

Perimeter Included

Get perimeter measurements automatically for material estimates.

Square Footage Formulas

The formula calculation is standard for this mathematical operation.

Rectangle: Area = Length \times Width

Variables Explained:

Rectangle
Area = Length × Width
Circle
Area = π × (Diameter ÷ 2)²
Triangle
Area = (Base × Height) ÷ 2
Conversions
1 sq ft = 0.0929 sq m = 0.111 sq yd

Worked Examples

Standard Bedroom
12×10 ft rectangular room

Inputs:

shape:
rectangle
length:
12
width:
10
units:
sqft

Result:

120 square feet

Large Living Room
20×15 ft rectangular space

Inputs:

shape:
rectangle
length:
20
width:
15
units:
sqft

Result:

300 square feet

Circular Patio
15 ft diameter circular patio

Inputs:

shape:
circle
length:
15
width:
15
units:
sqft

Result:

176.7 square feet

Frequently Asked Questions