How much does a pallet of concrete blocks weigh?

Depends on which size block and type. A 8x8x16 (common size) thick blocks with heavy gravel mix and small 3 ports can average around 56 lbs. or as light as 28 pounds if hollow with lightweight mix. There are usually 108 8x8x16 blocks on a pallet. This gives you an approximate weight between 1.5-3 tons. That is between 3,000 and 6,000 pounds.