Most powerful bomb ever detonation

Most powerful bomb ever detonation is Russian Tsar (emperor) nuclear bomb.   .Developed by the Soviet Union, the bomb was originally designed to have a yield of about 100 megatons of TNT (420 PJ); however, the bomb yield was reduced to 50 Megatons — one quarter of the estimated yield of the 1883 eruption of Krakatoa — in order to reduce nuclear fallout. Only one bomb of this type was ever built and it was tested on October 30, 1961, in the Novaya Zemlya archipelago.