Collected here is the most recent information about the composition of global nuclear weapons stockpiles. Click on the name of the country for more detailed information:

1.  For the purposes of this table "strategic delivery systems" refers to ballistic missiles or bombers with a range greater than 5,500 km. "Warheads," refers to the total number of actual deployed nuclear warheads on these delivery systems. "Total Weapons" includes deployed strategic warheads, plus tactical weapons and weapons held in reserve.

2. Ibid.

3. Israel is thought to possess enough nuclear material for between 130-170 nuclear weapons. The exact number of weapons Israel has assembled is unknown but is most likely on the lower end of the possible range. In all, Israel is thought to have produced between 510-650 kilograms of weapons-grade plutonium. (David Albright and Kimberly Kramer, "ISIS Estimates of Unirradiated Fissile Material in De Facto Nuclear Weapon States, Produced in Nuclear Weapons Programs," in Global Fissile Material Inventories, 2003. Available at www.isis-online.org/global_stocks/de_facto_states.html.) For more, see "Deadly Arsenals: Nuclear, Biological, and Chemical Threats," by Joseph Cirincione with Jon B. Wolfsthal and Miriam Rajkumar.

4. India possesses the components to deploy a small number of nuclear weapons within a few days and has produced enough weapons-grade plutonium to produce between 75-110 nuclear weapons. The Natural Resources Defense Council estimates that India has approximately 30-35 warheads. India is thought to have produced between 334 and 504 kilograms of weapons-grade plutonium and a smaller, but unknown amount of weapons-grade uranium. For more, see "Deadly Arsenals: Nuclear, Biological, and Chemical Threats," by Joseph Cirincione with Jon B. Wolfsthal and Miriam Rajkumar.

5. Pakistan has produced enough weapons-grade uranium to produce between 50-110 nuclear weapons. In all, Pakistan is thought to have produced between 1,110 - 1,440 kilograms of highly enriched uranium and may possess enough weapons-grade plutonium for the production of three to five weapons. For more, see "Deadly Arsenals: Nuclear, Biological, and Chemical Threats," by Joseph Cirincione with Jon B. Wolfsthal and Miriam Rajkumar.

6. Almost 15 years after the end of the Cold War, the United States and Russia maintain several thousand nuclear weapons on hair-trigger alert, or "launch-on-warning" status, for immediate launch in the case of a nuclear attack. The other nuclear powers either have dealerted their forces (China) or maintain far lower levels of alert (Britain and France.) 

**The official numbers from the START process differ from these figures. The treaty method counts deployed systems and launchers awaiting destruction (and have counting rules that undercount bomber-carried weapons). The latest official data from the April 2004 START I Memorandum of Understanding (MOU) is available by Clicking here.**

Sources:

Bulletin of the Atomic Scientists - Nuclear Notebooks

Deadly Arsenals: Nuclear, Biological, and Chemical Threats

START Aggregate Numbers of Strategic Offensive Arms - US Dept. of State Fact Sheet, 1 October 2005