No, you cannot put any mattress on a futon frame. A futon frame is intended to accommodate a futon mattress, which is often more flexible and made with different ingredients than a normal mattress. A conventional mattress may be too thick and unyielding to fold correctly on a futon frame, potentially damaging both the frame and the mattress.

The first step towards determining what size futon bed you need is measuring your room. You need at least 2 feet of open space on either side of your bed to avoid mobility issues. Then, consider how many people will be sleeping on your futon bed. If you plan to have just single sleepers or occasional overnight guests, you can opt for a smaller futon. On the flip side, if you’re unsure or know you’ll have multiple visitors, you should opt for a queen or king size futon.

A futon may be particularly pleasant to sleep on because it offers enough support and pressure relief at key points of the body. It is appreciated for its adaptability and versatility. A futon mattress's firmness level may vary from moderately soft to firm.