Quilt Size Calculator: Finished Quilt Size for Any Mattress, Depth and Drop

Choose your mattress, measure how deep it is, and decide how far the quilt should hang. The calculator gives the finished quilt size, the closest standard size, and a quick batting, backing and binding summary so you can shop for everything at once.

Your bed

Mattress Crib (28 x 52 in)Toddler (28 x 52 in)Twin (38 x 75 in)Twin XL (38 x 80 in)Full (53 x 75 in)Queen (60 x 80 in)King (76 x 80 in)California King (72 x 84 in)Split King (76 x 80 in) Custom size

Mattress width (in)

Mattress length (in)

Mattress depth (in)

Measure yours: 8 to 14 is common

Drop style Coverlet (depth + 3 in) Comforter (to mattress bottom) Bedspread (to the floor) Custom drop

Custom drop (in)

Used with Custom drop

Mattress top to floor (in)

Used with Bedspread

Pillow tuck None 10 in 12 in 15 in

Shrinkage allowance None (prewashed) 3 percent 5 percent

Your results

Finished quilt size

90 x 95 in

7.5 x 7.9 ft, 229 x 241 cm

Closest standard size

Queen (90 x 95 in)

Drop per side	15 in
Piece the top at	90 x 95 in
Batting package (4 in extra per side)	King (120 x 120 in)
Backing, 42 in cotton	8 1/4 yd
Backing, 108 in wide	2 3/4 yd
Binding, 2 1/2 in strips	11 strips, 7/8 yd

How do you calculate quilt size for a bed?

A bed quilt is sized from the mattress, not from a chart. Three measurements do all the work: the mattress width, the mattress length, and the drop, which is how far the quilt hangs down from the top edge of the mattress. A pillow tuck is optional.

1. Pick the drop. For a coverlet, this calculator uses the mattress depth plus 3 inches, so the quilt covers the mattress sides and just overlaps a bed skirt. A 12 inch deep mattress gets a 15 inch drop.
2. Width: mattress width plus two drops. The quilt hangs down both sides. For a queen: 60 + 2 x 15 = 90 inches.
3. Length: mattress length plus one drop, plus any pillow tuck. The head of the quilt stops at the headboard, so only the foot gets a drop. For a queen: 80 + 15 = 95 inches.
4. Add shrinkage if it matters. Divide by the fraction left after shrinking. A 4 percent shrink means piecing the top at about 94 x 99 inches so it washes down to 90 x 95.

The same rule gives a floor-length bedspread. With 22 inches from the mattress top to the floor and a 12 inch pillow tuck, the queen becomes 60 + 2 x 22 = 104 inches wide and 80 + 22 + 12 = 114 inches long. That is 14 inches wider and 19 inches longer than the coverlet, which matters when you plan fabric, batting and quilting time.

What size quilt do I need for each mattress size?

Every row below comes from the calculator with a 12 inch mattress. The coverlet column matches the coverlet convention in our quilt size chart; the bedspread column assumes 22 inches to the floor and a 12 inch pillow tuck. Mattress dimensions follow the mattress size chart.

Crib quilts are sized differently because they should stay out of an infant sleep space; see the crib quilt size page for nursery sizes. A split king uses two twin XL mattresses side by side and is quilted as a king.

How far should a quilt hang over the side of the bed?

Drop is a style choice, and it changes the size more than the mattress does. Published drop ranges for each style are below, along with what the calculator produces for a queen mattress 12 inches deep.

For a bedspread, the drop is simply the height from the top of the mattress to the floor, so measure your own bed. Tall platform frames and deep mattresses can push that past 24 inches. For a coverlet, the goal is to hide the mattress edge, which is why the calculator ties the drop to the mattress depth rather than using one number for every bed.

How does mattress depth change the quilt size?

Mattress depth is not part of any US size standard. Many adult mattresses are 8 to 14 inches deep, and pillow-top or hybrid mattresses can be 16 inches or more. Each extra inch of depth adds two inches to the width of a coverlet and one inch to its length.

This is the most common reason a store-bought queen quilt looks skimpy on a new bed. A 16 inch pillow-top needs a 98 x 99 inch coverlet, which is wider than a 90 inch queen quilt and closer to a king. If you are making a quilt as a gift, ask for the mattress depth, or plan a generous drop.

Should you make a quilt bigger to allow for shrinkage?

Cotton quilts commonly shrink about 3 to 5 percent in the first wash; add 2 to 3 in if an exact finished size matters. Cotton batting and unwashed cotton fabric shrink the most, and many quilters like the soft crinkle that results. If the finished size matters, for example a bedspread that should just touch the floor, choose a 3 or 5 percent allowance in the calculator. It divides the target size by the fraction left after shrinking and rounds up to the next half inch, so the "Piece the top at" line tells you the size to aim for before quilting.

Quilting itself also draws a quilt in. Dense free motion quilting can take up more than an inch across a bed quilt, while widely spaced straight lines take up very little. The allowance is a planning margin, not a promise, so check your batting package for its published shrinkage.

What size batting, backing and binding go with the quilt?

Once you know the quilt size, everything else follows. The results panel sizes batting and backing with 4 inches extra per side, a common longarm allowance. That is why a 90 x 95 inch queen quilt shows a king batting package: a 90 x 108 inch queen batt is only 90 inches wide, which leaves no margin on a 90 inch quilt. For exact numbers with your own overage, use the batting size calculator, the quilt backing calculator and the quilt binding calculator.

Size also decides how you will quilt it. A throw at 50 inches wide rolls through most home machines. A queen at 90 inches wide is a lot of fabric to push through a standard harp, and a king at 106 inches is where many quilters either send the top to a longarmer or move up to a machine with more throat space. The throat space calculator shows what each width really needs.