Converting a full bed to a queen is a smart move for anyone looking to save money, reuse existing furniture, or make better use of their space. Whether you’re upgrading a guest room, keeping a beloved old bed frame, furnishing a rental, or simply trying to stretch your budget, making this change can be a practical and rewarding decision.

However, it’s not as simple as swapping one mattress for another. A queen mattress is about 6 inches wider and 5 inches longer than a full, and those extra inches make a noticeable difference—not only for your comfort and sleeping space but also for frame compatibility, support, and overall aesthetics. Without the right adjustments, you could end up with gaps, uneven support, or even damage to your frame.