What size bedframe would you need for 2 twin mattresses?

To accommodate two twin mattresses, you would need a bedframe that is designed for a "king" size bed. Twin mattresses typically measure 38 inches wide by 75 inches long, so when placed side by side, they create a total width of 76 inches and a length of 75 inches. Therefore, a king bedframe, which measures 76 inches wide by 80 inches long, would be the appropriate choice.