According to Bettinger, ironing boards come in four sizes. A standard board is usually 54 inches long and 15 inches wide. Over-the-door boards are a bit smaller than standard, and tabletop and folding tabletop boards vary in size, but can fit on a small kitchen table. It is important to consider the volume of clothes you iron and your available space when picking the right size ironing board for your home. Luckily, most boards fold flat.