A king size blanket typically requires 8 to 9 yards of fabric, depending on the width of the fabric and desired overhang.

A standard king size bed measures 76 inches wide by 80 inches long. For a blanket that drapes over the sides, you'll need fabric that's at least 102 inches wide and 86 inches long. Most fabric comes in 45-inch or 60-inch widths, so you'll need to join panels together. With 45-inch wide fabric, you'll need approximately 8 yards; with 60-inch wide fabric, you'll need about 6 yards. Add extra if you want a longer drop or thicker batting.

Comparison of Fabric Requirements by Width

Factors Affecting Fabric Requirements

• Drop length: Standard is 16-20 inches on each side; more drop requires additional fabric
• Bedding style: Coverlets need less fabric than comforters with thick batting
• Pattern matching: Directional prints or patterns may require 10-20% more fabric
• Seam allowances: Add 1/2 inch per seam for joining panels

Tips for Buying Fabric

• Buy extra: Purchase 1/2 yard more than calculated to account for errors
• Pre-wash: Wash and dry fabric before cutting to prevent shrinkage
• Check width: Measure actual fabric width as it can vary by manufacturer
• Consider direction: One-way designs may need all panels oriented the same way