0 roughly calculated or approximate:
1 used when saying what the cost, size, value, etc. of something is believed to be, although it is not known for certain:
The estimated costs of the building project are well over £1 million.
The 77th edition of the Indianapolis 500 was held before an estimated 450,000 fans.
There are an estimated 1.5 million HIV carriers in the country.
The estimated worth of the plastics and petrochemical industry is about $640 billion.
