A double duvet is a type of quilted blanket that goes inside a protective duvet cover and is designed to fit a double bed. The dimensions of a double duvet can vary depending on the manufacturer and the desired amount of overhang, but in the UK, a double duvet usually measures 200 x 200 centimeters or 79 x 79 inches. Here are some additional size recommendations for other bed types:

• Twin bed: 64 x 89 inches
• Twin XL bed: 74 x 98 inches
• Full/Double bed: 80 x 89 inches
• Queen bed: 86 x 92 inches

Its important to choose a duvet size that matches your mattress size to get the look just right. You can measure your bed frame or mattress to determine the appropriate duvet size.