Here we will demonstrate how to measure the volume of a balloon. A balloon is not a straight edged polygon shape, usually, so the mathematical equations get that much harder, on the flip side, it may be a spherical or ovalish shape, but measurements with math alone are detrimental due to the uneven sizes of the balloon. Here is how to do it properly. You will need a bucket, preferably, to hold water, a larger container than your original bucket, and a measuring container. Place the bucket inside of the larger container, fill the bucket with water, now place an inflated balloon into the bucket of water (bucket must be filled to the brim), totally submerge it, remove bucket, and dump the water in the larger container into the measuring container, measure the water, you now have the volume.