# How to Calculate Volume

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

### Instructions

- 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. - 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. - 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. - 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. - TIP: Search the internet using the key words "volume" and "formulas" for volume formulas for less commonly shaped objects.
- 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. - FACT: About 96.5% of the world's water supply is held in the ocean, seas, and bays.

### You Will Need

- Object to be measured
- Geometric formulas
- Water
- Graduated cylinder