Volume of a Box

• 1). Measure the length and width of one face of the box.
  
  
• 2). Multiply the length by the width to find the surface area of the face. For example, if the face of a box is 4 inches wide and 3 inches long, the surface area is 12 square inches.
  
  
• 3). Measure the depth of the box.
  
  
• 4). Multiply the depth by the surface area to find the cubic area. If the box is 2 inches deep, its volume would be 24 cubic inches.
  
  

Volume of a Sphere

• 1). Wrap a string around the circumference of the ball.
  
  
• 2). Measure the length of the string section you used to wrap around the circumference.
  
  
• 3). Divide the length by 2, then divide by pi to find the radius of the sphere. For example, a ball with a circumference of 12.56 inches would have a radius of 2 inches.
  
  
• 4). Find the cube value of the radius by multiplying it by itself, then multiplying that result by the radius again. For example, you would multiply a radius of 2 by itself to yield 4, then multiply 4 by 2 to yield 8.
  
  
• 5). Multiply the result by 4, then by pi, and divide the result by 3 to find the cubic area. The sphere in this example has a cubic area of 33.51 inches.
  
  

Volume of a Cylinder

• 1). Wrap a string around the circumference of the cylinder.
  
  
• 2). Measure the length of the string section you used to wrap around the circumference.
  
  
• 3). Divide the length by 2, then divide by pi to find the radius of the sphere. For example, a cylinder with a circumference of 18.84 inches would have a radius of 3 inches.
  
  
• 4). Multiply the radius by itself, then by pi to find the surface area of one circular face. This cylinder would have a surface area of 28.27 inches.
  
  
• 5). Measure the height of the cylinder, then multiply by the surface area of the circular face to find the cubic area of the cylinder. If the example cylinder is 4 inches tall, it has a volume of 113.09 inches.