Measure the length of the area
Measure the width of the area
Multiply length by width
Use the same unit for both measurements
Convert inches to feet before multiplying if needed
For irregular shapes, divide the area into smaller rectangles
Calculate the square footage of each section
Add the square footage of all sections together
For triangles, multiply base by height and divide by 2
For circles, multiply pi by the radius squared
Round to the nearest whole number if needed