Even if you're just layering a quilt or a coverlet on top of your main bed covering, it's important to make sure you're picking the right size. Too big and you risk covering up more of your prized bedspread than you'd planned. Too small and your bed ensemble won't look quite right.
Keep in mind that your quilt or coverlet is meant to cover the mattress only. The thickness of your mattress will factor heavily into which size you should buy.
Mattress Sizes (in inches):
Twin 39"x75", Full 54"x75", Queen 60"x80", King 76"x80", Cal King 72"x84"
How to Measure Your Mattress for a Quilt or Coverlet Set
Materials
Tape Measure
Dimensions
Width is the measurement from left to right across the top of the mattress
Length is the measurement across the top of the mattress from the head to the foot
Depth is the measurement of thickness from the top edge of the mattress to the bottom edge
Directions
To start, measure the width and length of your mattress.
Next, determine the depth of your mattress only.
Add the depth to the width twice.
Add at least 4 inches to the width to allow for additional fabric overhang. Mattress width + mattress depth + mattress depth + 4" for overhang = quilt/coverlet width
Add the depth to the length just once.
Add at least 2 inches to the length to allow for additional overhang. Mattress length + mattress depth + 2" for overhang = quilt/coverlet length
Compare your new dimensions to the bedding sizes.
Hint! 2 inches of overhang is the very least you should have! Longer overhangs are acceptable depending on how far you want your coverlet or quilt to hang.
Example
You measure your mattress as 76 inches wide by 80 inches long.
Next, you measure your mattress depth as 10 inches.