The British government is be "more open" about the UK's nuclear weapons capability after announcing it will retain a maximum of 225 warheads.
It was revealed in 2006, that Britain had 160 "operationally available" warheads, but the extra numbers needed above this to allow for maintenance were not stated.
Foreign Secretary William Hague told the House of Commons the disclosure would help build trust between nuclear and non-nuclear states.
The BBC reports the United States and France have already released details of their total warhead numbers.
The new coalition government has also said it will review the long-standing policy dictacting when the UK would be prepared to use nuclear weapons to make sure it is still up to date and realistic.