What is one way to find the volume of an irregularly shaped object?

Please help need it in like an hour thanks allot if you help !!!! ;]]]What is one way to find the volume of an irregularly shaped object?
if you know its density, you can divide its density by its mass. if it is somewhat regular, like a shape with a symmetrical axis, like one of those wooden stair-railing poles, you can use solids of rotation (calculus)What is one way to find the volume of an irregularly shaped object?
Use the water displacement method. Fill a beaker or other measuring tool with measurable numbers with water up to a certain point and record. Then, gently place the item into the water and determine how much the water raises. Then subtract the difference. The answer is the volume of the irregular shaped object.