Approximately 185,000 pounds empty (83,250 kilograms)
Maximum Takeoff Weight:
488,000 pounds (219,600 kilograms)
Unrefueled 8,800 miles (7,652 nautical miles)
NOTE: The B-52 can carry 27 internal weapons. Authoritative sources diverge as to maximum munition loads, with some suggesting as many as 51 smaller munitions and 30 larger munitions, while others suggest maximum loads of 45 and 24, respectively.
The Heavy Stores Adaptor Beam [HSAB] external pylon can carry only 9 weapons which limits the total carry to 45 (18 external).
The AGM-28 pylon could carry lighter weapons like the MK-82 and can carry 12 weapons on each pylon, for a total of 24 external weapons, for a the total of 51. However, the AGM-28 pylon is no longer used, so the B-52 currently carries on HSABs, limiting the external load to 18 bombs, or a total of 45 bombs.
Approximately 70,000 pounds (31,500 kilograms) mixed ordnance -- bombs, mines and missiles.