The British Museum offers a searchable database of 1,927,244 objects from the Museum’s collection. There are images for 584,256 of these objects, or about 30% of searchable objects.
But what percentage of the museum’s holdings have been included in the database? An exact number is not given, although given the size of the Museum, it’s possible that even they don’t know. This detailed list of what is not available on the database lists coins and medals, prints and drawings, and cuneiform tablets and Middle Eastern ivories as the only categories of objects which have not yet been included in the database. Objects are being added to the database at the rate of 3,000 per month. For an idea of what is contained in their general collection, click here.
The British Museum also houses a number of libraries and the museum archives, all of which are open to “researchers of all levels”. These are summarized here. Search the Museum’s print collections with their online catalogue.