Know that density is equal to an object's mass divided by its volume. Therefore, in order to determine density, you must first find the object's mass. Note that to properly calculate density, you need to find the mass in grams. You can use a balance with gram weights, or you can find the mass with a scale and convert the units to grams.

Find the object's volume. There are two ways to find volume. If the object has a regular shape such as a rectangular prism, you can use a volume formula; (L x W x H) and you will need to measure the object in centimeters (cm).

Alternatively, you can use a graduated cylinder to measure volume. Simply fill the graduated cylinder with water and note this measurement. Then, drop the object to be measured in the cylinder. Find the difference between the new and original measurements on the graduated cylinder. This is the object's volume (cm³).

*Please note 1cm³ = 1ml, but always use cm³.

You can also use a displacement container that pushes out the object's equal amount of water in to a container that can be poured into and measured with a graduated cylinder. For your density calculation, you will need a volume in cubic centimeters (cm³), so make sure to convert units accordingly.

Use the object's mass and volume to find density. Density equals mass divided by volume. Simply make this calculation, and you have found the object's density. Make sure to label your final calculation with the proper units: g/cm³.