What is the largest undetonated nuclear bomb ever made to date?

Question

and what is its yeild in meg/kilo tons of tnt

Answer 1

The 50 megaton nuclear device dropped by the Soviet Union in the 1960s was capable of a 100 meg. yield. Since then, it has been deactivated and strategic nukes are now in the 500 kiloton range....

Answer 2

Tsar Bomba (Russian: Царь-бомба, literally "Emperor Bomb") is the Western name for the RDS-220, which was the largest, most powerful nuclear weapon ever detonated. Developed by the Soviet Union, the bomb had a yield of about 50 megatons of TNT and it was codenamed Ivan by its developers.

The bomb was tested on October 30, 1961, in Novaya Zemlya, an archipelago in the Arctic Sea. The device was scaled down from its original design of 100 megatons to reduce the resulting nuclear fallout.

Answer 3

The Soviets built and tested a bomb reported to have been 50megaton. It was exploded in a remote Arctic testing range in northern Siberia in the '60s The bomb test was recorded by every seismic recorder on the planet. The project was abandoned and the weapon deemed too expensive to stockpile and maintain and no further bombs of that size have been produced. Current stockpiles of nuclear weapons in the former Soviet Union include multiple warhead missiles of the 5 to 10 megaton range and some smaller tactical missiles of 50kt to 1megt. More than enough to make the planet uninhabitable for thousands of years. Also, Russia does not control a large number of those weapons. They belong to the former "satellite" states. The United states has a similar arsenal that includes MRV technology and several "Boomer" submarines any of which could destroy a country in minutes.

Answer 4

I believe the Russians made some that were in the multiple megaton range.