According to Ocean's Depth and Volume Revealed - Live Science, the ocean's volume is approximately 1.332e+18 cubic metres
A group of scientists used satellite measurements to get new estimates of these values, which turned out to be 0.3 billion cubic miles (1.332 billion cubic kilometers) for the volume of the oceans and 12,080.7 feet (3,682.2 meters) for the average ocean depth.