As of October 2023, the countries known to possess nuclear submarines include the United States, Russia, China, France, and the United Kingdom. The United States has around 68 operational nuclear submarines, while Russia has approximately 60. China operates around 12, and both France and the United Kingdom have about 10 each. India is also developing its nuclear submarine capabilities and has launched its first operational vessel.
230
one
From Wikipedia: Today, six countries deploy some form of nuclear-powered strategic submarines: the United States, Russia, France, the United Kingdom, People's Republic of China, and India Several other countries, including Argentina and Brazil, have ongoing projects in different phases to build nuclear-powered submarines.
The PLA navy has more than 225,000 personnel and is thought to have as many as 70 submarines, 10 of them nuclear-powered
170
nearly 155
Reactors power submarines and many surface ships. Nuclear weapons.
Most submarines now have a single nuclear reactor. Some smaller, coastal submarines have a single diesel.
8
In the US Navy alone, there have been 25 classes of nuclear submarines, resulting in some 211 hulls. Each class of submarine has different specifications, and different ranges of speeds, each being used for different missions. Submarines within each class can differ in specifications that can affect their top speeds. By and large, the actual specifications such as speed for any nuclear equipment is classified, but the unclassified top speed ranges vary surface and submerged from around 15 knots of the Skipjack class (surfaced) to 35 knots of the Seawolf class (submerged). It is just not possible to give a more specific answer as there are literally so many different nuclear submarines in the world with so many different capabilities. Generally, the US has stood at the forefront of submersible technology, and while the nuclear boats of other nations may for a time exceed the capabilities of current US vessels, it is typically a short lived place for them.
As of October 2023, thousands of submarines have been built since their inception, with estimates suggesting around 2,000 to 2,500 submarines constructed globally across various classes and types. The exact number varies as new submarines are commissioned and older ones are decommissioned. Major naval powers like the United States, Russia, and China have produced significant numbers of submarines, both nuclear and diesel-electric. Additionally, many countries have developed their own submarine fleets, contributing to the overall total.
About 2,100 by many different countries.