How much water makes a car float?

The amount of water needed to make a car float depends on the car's weight and the principles of buoyancy. Generally, a vehicle must displace a volume of water equal to its weight to float. For most cars, this means they would need to be in a body of water deep enough to displace several hundred to over a thousand gallons of water, depending on the specific car model and its weight. However, most cars are not designed to float and can quickly sink in water.