52.4 inches

Sturdy bed frame stucture:Powder coating finish, made of durable steel with a sleek white finish; designed for sleepers up to 300-500 pounds, no quaking & scratching,noise-free, strong packaged.
Full size bed frame and storage space:Approx outer size:78”x52.4”x43.5” (LxWxH),provides extra under-the-bed storage space with a vertical clearance of about 13″ inches to tidy your clothes,toys or quilts.
Metal full bed frame one box packing and easy assembly. package includes instruction and all parts and needed tools. Please follow assembly instruction and vedio for proper assembly. Accommodates a matching-size mattress.