Status of World Nuclear Forces
More than two decades after the Cold War ended, the world's combined inventory of nuclear warheads remains at a very high level: more than 16,000. Of these, nearly 4,200 warheads are considered operational, of which about 1,800 US and Russian warheads are on high alert, ready for use on short notice.
Despite significant reductions in US, Russian, French and British nuclear forces compared with Cold War levels, all the nuclear weapon states continue to modernize their remaining nuclear forces and appear committed to retaining nuclear weapons for the indefinite future.
The exact number of nuclear weapons in each country's possession is a closely held national secret. Despite this limitation, however, publicly available information and occasional leaks make it possible to make best estimates about the size and composition of the national nuclear weapon stockpiles:
Status of World Nuclear Forces 2014*
* All numbers are approximate estimates and further described in the Nuclear Notebook in the Bulletin of the Atomic Scientists, and the nuclear appendix in the SIPRI Yearbook. See also status and 10-year projection of U.S. and Russian forces. Additional reports are published on the FAS Strategic Security Blog. Unlike those publications, this table is updated continuously as new information becomes available. Current update: April 30, 2014.
a This number is higher than the aggregate data under the New START treaty because this table also counts bomber weapons at bomber bases as deployed. Detailed overview of Russian forces is here.
Additional older Information (no longer updated): Detailed World Summary