The Community Foundation of Middle Tennessee announced the total amount on Wednesday from the nine sold-out concerts. The nonprofit company already has $4.35 million in hand.
The concert series was performed at Nashville's Bridgestone Arena.
The flooding was one of Tennessee's worst natural disasters, costing over $2 billion in damage in Nashville alone and killing 22 people across the state.
The proceeds will go to The River Fund, a charitable fund within the Community Foundation.
Brooks said in a statement that he was honored to have been able to help.
"Playing music has never felt better or ever felt more right," he said.
The Associated Press contributed to this report.