Identify the shape
Use the correct volume formula for that shape
Measure the needed dimensions
Convert all measurements to the same unit
Substitute the values into the formula
Calculate the result
Write the answer in cubic units
For a rectangular prism: volume = length × width × height
For a cube: volume = side × side × side
For a cylinder: volume = π × radius² × height
For a sphere: volume = 4/3 × π × radius³
For a cone: volume = 1/3 × π × radius² × height
For a pyramid: volume = 1/3 × base area × height
For irregular objects: use water displacement or break the shape into smaller parts