Created with Sketch. Created with Sketch.

Surface Area Calculation Tool

Use these forms to calculate surface area of common shaped items.

Two Dimensional Objects

Square and Rectangle:

Rectangle

Length: Height:
Plate Both Sides? Yes
  No
  Answer:

Circle:

Circle

Radius(r):
Plate Both Sides? Yes
  No
Answer:

Ellipse:

Ellipse

r1: r2:
Plate Both Sides? Yes
  No
  Answer:

Triangle:

Triangle

Base (b): Height (h):
Plate Both Sides? Yes
  No
  Answer:

Parallelogram:

Parallelogram

Base (b): Height (h):
Plate Both Sides? Yes
  No
  Answer:

Three Dimensional Objects

Cube or Brick :

Cube or Brick

Length (l): Width (w): Height (h):
  Answer:

Pyramid:

Calculate the area of all the triangular sides of the pyramid using the triangle tool above. Add the surface area of the base, which may be rectangular, or triangular.

Sphere:

Sphere

Radius (r): Answer:
 

Egg:

Egg

Radius 1 (r1): Radius 2 (r2): Answer:
   

Cylinder:

Cylinder

Radius (r): Height (h): Answer:
   

Tube:

Cylinder

Radius (r): Height (h):
Plate Inside Of Tube ? Yes
  No
  Answer:

Bolts:

Bolts

Radius (r): Length (L):  
Height of Head (H): Length of Head (F):  
  Answer:

Complex Shapes:

Complex Shapes

To effectively work out a complex surface area, as shown left.

Simply place an imaginary grid of 1” squares over the part, and count the whole squares. Then go around the perimeter and add up all the squares that are more than ½ full. Divide the total by 2 and add this to your total of completely filled squares.

Another method is to cover the part with one layer of paper or tinfoil. Then remove the tinfoil and cut into smaller pieces so it can be arranged on the floor as close to a rectangle shape as possible. Then simply multiply length x width of the rectangle.