United States United States
ICBMS| Type | CEP (nm) | Weapon Details (number x yield) | Number of SNDV |
| Minuteman III (Mk12A) | .07 | 1 or 2 x .335 MT | 200 (250 total warheads) |
| Minuteman III (Mk 21) | .05 | 1 x .30 MT | 250 |
SLBMS| Type | CEP (nm) | Weapon Details (number x yield) | Number of SNDV | Trident D-5 | .05 | 4 x .455 MT | 288 |
BOMBERS| Type | CEP (nm) | Weapon Details (number x yield) | Number of SNDV |
| B-52H, ALCM | NA | 20 x .15 MT (ALCM) | 72 |
| B-2 | NA | 16 x .5 MT | 19 |
Russia
ICBMS| Type | CEP (nm) | Weapon Details (number x yield) | Number of SNDV |
| SS-18 m4 | .23 | 10 x .75 MT | 60 |
| SS-19 m3 | .19 | 6 x .75 MT | 40 |
| SS-25 mobile | .10 | 1 x .55 MT | 120 |
| SS-27 | .19 | 1 x .55 MT | 52 |
| SS-27a mobile | .19 | 1 x .55 MT | 18 |
| RS-24 mobile | .13 | 3 x .20 MT | 12 |
SLBMS| Type | CEP (nm) | Weapon Details (number x yield) | Number of SNDV |
| SS-N-18 M1 | .45 | 3 x .05 MT | 48 |
| SS-N-23 | .27 | 4 x .1 MT | 96 |
| SS-N-32 | .19 | 6 x .1 MT | 32 |
BOMBERS| Type | CEP (nm) | Weapon Details (number x yield) | Number of SNDV |
| Blackjack (Tu-160) | NA | 12 x AS-15B ALCM (.25 MT) or bombs | 13 |
| Bear H16 (Tu-95) | NA | 16 x AS-15A ALCM (.25 MT) or bombs | 31 |
| Bear H6 (Tu-95) | NA | 6 x AS-15A ALCM (.25 MT) or bombs | 28 |
In general, I have taken the type of weapons to be counted from the State Department document listed below, which lists the "START countable" weapons systems. But in some cases I have deviated. For example, the B-1 bomber is listed in the treaty. However, it has been assigned a conventional role, so I don't believe it would be "readily available" for a nuclear role. So it isn't listed in the table.
As well, some the provisions of the treaty (the "counting rules") may strike the observer as a bit odd. At the time of the negotiation, it was felt that bombers armed with gravity bombs were the least dangerous type of strategic weapons delivery system. This is because their flight time (about the same speed as a commercial jet aircraft) from one homeland to the other is so long that the target country would be very likely to know a bomber strike was coming. As well, planes armed with bombs would have to travel all the way to the target to strike it, and would be vulnerable to anti-aircraft defenses. These bombers are treated differently in START. ICBMs, SLBMs, and bombers armed with cruise missiles all have some agreed upon number that represents the number of warheads or cruise missiles they would carry. But bombers that are considered to be armed with gravity bombs are considered to only have one weapon. This is clearly not accurate. But it did encourage both sides to take advantage of this rule and deploy more bombers with gravity bombs instead of missiles with multiple warheads.
But knowing that does not make it easy to supply the "real" bomb load. Why? First of all, bombers can be armed in a variety of ways. They can carry different types of nuclear bombs, for example. And they may not always carry the maximum number. One more interesting complication. A number of nuclear weapons are designed with a variable yield. So depending on the "setting," the total megatonnage carried by the bomber can change.
So when you see any specific figures for the weapons carried by a bomber, understand that estimate of the amount of megatonnage is just that, an estimate. This is particularly important to keep in mind because bombers can carry a lot more megatonnage than an ICBM or a SLBM.
Bomb loads for US bombers
Russian Cruise Missile Yields
U.S. Nuclear Bomb Characteristics
CEP Values
Images scanned from SOVIET MILITARY POWER, 1988, 1990-1991. Dept. of Defense.