Want to buy Bed sheets not know the size ,please check below Don’t let the wrong sheet size lead to a restless night of sleep. Here are common mattress sizes and their accompanying sheet pairings. Size Mattress size (in) Mattress size (cm) Fitted sheet size Flat sheet size Duvet cover size Twin 38” x 75” 96.5 x 190.5 cm Twin Twin Twin Twin XL 38” x 80” 96.5 x 203 cm Twin XL Twin, Twin XL Twin Full 53” x 75” 134.5 x 190.5 cm Full Full, Queen Full, Queen Queen 60” x 80” 152.5 x 203 cm Queen Queen Queen King 76” x 80” 193 x 203 cm King King, Cal-King King, Cal-King California King 72” x 84” 183 x 213 cm Cal-King King, Cal-King King, Cal-King The above chart will help you determine what sheet sizes fit each classic mattress size. If you have a less common mattress size or additional mattress toppers, you may need to determine the right size based on your specific measurements.