Its wingspan was first estimated at five metres (16.4 feet).

Natural gas reserves were once estimated at 140 billion cubic metres.

Its length was in 2004 estimated at 2.1 metres.

The swimming speed of Ophthalmosaurus has been estimated at 2.5 metres per second or greater.

This represented a juvenile individual though; adult length has been estimated at four metres.

Rates of the top course gravel movement have been estimated at 7.5 metres a year.

In 2001 water use has been estimated at between 1,350 and 1,700 million cubic metres per year.

Domestic water use was estimated at between 300 and 390 million cubic metres per year.

In 2004, roundwood production was estimated at 811,000 cubic metres.

The type and only known individual is estimated at 5 metres (16.5 ft).