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New Estimates of the U.S. Nuclear Weapons Stockpile, 2007 and 2012

The Bush administration declared in June 2004 that the U.S. nuclear stockpile will be cut "nearly in half" by 2012. The exact numbers are classified, but based on our knowledge about the current stockpile and future force structure plans we estimate that the total number of warheads will decline from approximately 9938 today to 5047 by the end of 2012 (see Table).

There are three categories of warheads that must be counted; active deployed, active non-deployed and inactive. Active deployed warheads are those on fielded systems such as ICBMs, SLBMs, and bomber and fighter bomber weapons. Active non-deployed warheads are the usual number of spares plus what has been referred to as "responsive" warheads, i.e., those warheads that could be returned to the field quickly to increase the number of deployed warheads. All active warheads are filled with limited life (i.e., tritium) components and maintained through regular surveillance schedules. Inactive warheads are still intact but have had their tritium removed and thus it would take longer to return them to service, if a decision were made to do so.

Finally there are warheads that have been removed from active service (the stockpile) and are in the process of being fully retired. Warheads stored in weapon bunkers at military bases are in DOD custody until they are handed over to DOE and sent to Pantex outside of Amarillo, Texas, for dismantlement. Over the coming years this category will increase to a sizable number of almost 5,000 warheads. Pantex's priority is not dismantlement but life-extension of active warheads, however, so dismantling the retired warheads will not be completed by 2012 but take another decade under current plans.

The types of warheads in the stockpile will be reduced from 15 different versions of nine basic types of warheads today, to an estimated 12 different versions of seven basic types in 2012.

Of the 5047 warheads we estimate will be left in the stockpile by 2012, most will not be counted under the provisions of the 2002 SORT agreement between the United States and Russia. Because the agreement only counts "operationally deployed strategic warheads," only 2192 warheads will be counted while another 2855 will be excluded.

The estimate for 2012 is based on statements about force structure plans made by government officials, and assumptions made by us about warhead retirements that are necessary to meet the declared force limits (see Table for details).


Estimates of the U.S. Nuclear Weapons Stockpile, 2007 and 2012
Warhead Type 2007 End 2012 Warheads to be Dismantled
Active Deployed Responsive/ Inactive*  Total  Active Deployed Responsive/ Inactive*  Total 
B61-3 200 186 386 200 50 250 136
B61-4 200 204 404 200 50 250 154
B61-7 215 224 439 120 300 420 19
B61-10 0 206 206 0 0 0 206
B61-11 20 21 41 20 15 35 6
W62 325 255 580 0 0 0 580
W76 1344 1686 3030 0 800 800 1430
W76-1 0 0 0 768 32 800 0
W78 550 244 794 200 200 400 394
W80-0 100 189 289 0 0 0 289
W80-1 1452 354 1806 300 228 528 1278
B83-0 0 298 298 0 293 293 5
B83-1 323 3 326 100 220 320 6
W84 0 383 383 0 0 0 383
W87 50 502 552 300 247 547 5
W88 384 20 404 384 20 404 0
Total 5163 4775 9938 2592 2455 5047 4891**


Notes and Assumptions

The table estimates that U.S. "operationally deployed" forces under the 2002 SORT agreement will be 2192 warheads by the end of 2012. Another 2855 warheads will not be counted under SORT. This is based on the following assumptions:

  • 450 MMIII ICBMs with 500 warheads, including 150 W87 warheads deployed at both Warren AFB and at Malmstrom AFB, 200 W78 warheads at Minot AFB.
  • 12 SSBNs MIRV x 4 with 1152 warheads (2 SSBNs in overhaul not counted), 800 W76-1s in initial Life Extension Program, no W88 depletion due to new pit production.
  • 32 B52 and 16 B-2 Combat Coded bombers with 520 warheads at Barksdale, Minot and Whiteman AFBs.
  • Consolidate all 528 ALCMs at Minot AFB, retire all Advanced Cruise Missiles.
  • Retire all B61-10 bombs.
  • Retire all W62 warheads.
  • Retire all W80-0 SLCM warheads.
  • Retire all W84 GLCM warheads.
  • Partial retirements of W78, W76, W80-1, B61-3/4.

* Active deployed means warheads on fielded systems such as ICBMs, SLBMs, and bomber and fighter bomber weapons. Responsive means warheads fully maintained but not operationally deployed and in storage. Inactive means the warhead has had its tritium removed.

** Warheads withdrawn for dismantlement for the period 2007-2012 could be completed by 2023, according the National Nuclear Security Administration.

This fact sheet was written by Robert S. Norris of the Natural Resources Defense Council (NRDC) and Hans M. Kristensen of the Federation of American Scientists (FAS), and is based on information collected over several decades by the authors about production, dismantlement and deployment of U.S. nuclear weapons.

The fact sheet can be helpful to Congress during its considerations of whether to approve the administration's request to resume industrial production of new nuclear weapons. The Bush administration announced in 2004 that it planned to cut the nuclear weapons stockpile "nearly in half" by 2012, but has refused to disclose the actual numbers. The fact sheet provides an unclassified estimate of the numbers that the authors feel approximates the actual numbers that remain classified.

For more information contact Robert S. Norris (202-289-2369) and Hans M. Kristensen (202-454-4695)


last revised 5.2.07

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