How to Calculate Volume

You can find the volume of various 3-D objects using a few simple mathematical formulas.

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You Will Need

• Object to be measured
• Geometric formulas
• Water

Steps

1. Step 1

Consider a rectangular or cubic solid

Consider a rectangular or cubic solid. Measure the length, width, and height of the object. Multiply these dimensions together to get the volume.

2. Step 2

Look at a cylindrical object

To find the volume of a cylinder, multiply the square of its radius by pi, or 3.14. Then multiply this value by the height of the cylinder.

3. Step 3

Calculate the volume of a cone

Calculate the volume of a cone. Measure the area of the cone's base -- pi times the radius squared -- then multiply by the height and divide by 3.

4. Step 4

Measure a sphere

Measure the radius of a sphere, then calculate the volume by multiplying 4/3 times pi times the cube of the radius.

5. Search the internet using the key words "volume" and "formulas" for volume formulas for less commonly shaped objects.

6. Step 5

Use water displacement

Place a solid object whose volume is to be measured in a graduated cylinder that has been partially filled with water. Measure the amount of water displaced by the object -- this is the object's volume.

7. About 96.5% of the world's water supply is held in the ocean, seas, and bays.