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To find the volume of an irregular object using a graduated cylinder, you can use the method of water displacement. Fill the graduated cylinder with a known volume of water, then carefully submerge the irregular object in the water. The increase in water level corresponds to the volume of the object. Subtract the initial volume from the final volume to determine the volume of the irregular object.
Fill the cylinder with water to a marked point. Then place the rock in the water and measure how much the water level rises. That will give you the amount of volume displaced by the rock and so the volume of the rock.
Note the level of water in the graduated cylinder. Place the rock into the water carefully. Note the higher level to which the water rises. The difference between the old level and the new level is the volume displaced by the rock.
Level with the bottom of the fluid's meniscus
Put water in the cylinder to a level that would cover the object. Drop the item in and if it sinks, read the new level on the graduations. The difference in volume between the two marks, is the volume of the item.