Quilt Layout Calculator
Free Quilt layout tool for clothing & sewing. Enter your details to get instant, tailored results and guidance. Get results you can export or share.
Formula
Blocks = floor((Interior + Sashing) / (Block Size + Sashing)); Fabric = Strips x Cut Size / 36 yards
The interior area is the quilt size minus borders. Blocks are calculated to fit within this area including sashing between them. Fabric yardage is determined by how many blocks can be cut per strip of fabric at the given bolt width.
Worked Examples
Example 1: Throw Quilt with 10-Inch Blocks
Problem: Design a 60 x 80 inch throw quilt with 10-inch blocks, 2-inch sashing, 3-inch border, and standard 1/4-inch seam allowance.
Solution: Interior = (60-6) x (80-6) = 54 x 74 inches\nBlocks across = floor((54+2)/(10+2)) = floor(4.67) = 4\nBlocks down = floor((74+2)/(10+2)) = floor(6.33) = 6\nTotal blocks = 4 x 6 = 24\nActual center = 4x10 + 3x2 = 46 wide, 6x10 + 5x2 = 70 tall\nActual quilt = 52 x 76 inches
Result: 24 blocks (4x6) | Actual size: 52 x 76 inches | Cutting: 10.50 in squares
Example 2: Baby Quilt with Small Blocks
Problem: Design a 36 x 48 inch baby quilt with 6-inch blocks, 1.5-inch sashing, 2-inch border.
Solution: Interior = (36-4) x (48-4) = 32 x 44 inches\nBlocks across = floor((32+1.5)/(6+1.5)) = floor(4.47) = 4\nBlocks down = floor((44+1.5)/(6+1.5)) = floor(6.07) = 6\nTotal blocks = 4 x 6 = 24\nActual center = 4x6 + 3x1.5 = 28.5 wide, 6x6 + 5x1.5 = 43.5 tall\nActual quilt = 32.5 x 47.5 inches
Result: 24 blocks (4x6) | Actual size: 32.5 x 47.5 inches | Cutting: 6.50 in squares
Frequently Asked Questions
How do I determine the right quilt block size for my project?
Choosing the right block size depends on your quilt pattern, finished size, and skill level. Common block sizes include 6, 8, 10, and 12 inches finished. Larger blocks like 12 inches are easier for beginners because they have fewer seams and are simpler to handle. Smaller blocks like 6 inches create more intricate designs but require more precision and sewing time. Consider your desired quilt dimensions when choosing block size because you want blocks to divide evenly into the quilt area. For example, a 60 by 80 inch quilt interior works perfectly with 10-inch blocks in a 6 by 8 layout. Also consider the complexity of the block pattern itself because highly detailed blocks with many small pieces are easier to construct at larger sizes.
What is sashing and how does it affect quilt layout?
Sashing refers to strips of fabric sewn between quilt blocks to separate and frame them visually. Sashing creates a grid-like appearance and helps define individual blocks within the overall quilt design. Common sashing widths range from 1.5 to 3 inches finished. Sashing affects your layout because it adds to the overall quilt dimensions and reduces the number of blocks that fit within a given size. For a 60-inch wide quilt with 10-inch blocks and 2-inch sashing, you fit 5 blocks across with 4 sashing strips rather than 6 blocks without sashing. Sashing also provides an opportunity to add cornerstone squares where sashing strips intersect, which adds another design element. Some quilters use sashing to unify blocks of different patterns or colors.
How much fabric do I need for a quilt backing?
Quilt backing should be at least 4 inches larger than the quilt top on all sides, giving you 8 inches of extra width and 8 inches of extra length. This extra fabric accommodates shifting during quilting and allows for trimming to square edges. For quilts wider than your fabric bolt width, which is typically 42 to 44 inches of usable fabric, you need to piece the backing by sewing two or more panels together. A 60 by 80 inch quilt needs backing of 68 by 88 inches, requiring two panels of 88 inches each from 44-inch wide fabric, sewn together with a center seam. This totals about 5 yards of fabric. Wide backing fabric at 108 inches is available and can eliminate seaming for most quilts.
How do I calculate binding fabric for a quilt?
Binding is the fabric strip that finishes the raw edges of a completed quilt. To calculate binding fabric, first determine the quilt perimeter by adding twice the width and twice the height, then add about 10 to 12 extra inches for corners and joining the binding ends. Divide this total length by the usable fabric width, usually 42 inches, to find how many strips to cut. Standard binding strips are cut at 2.25 to 2.5 inches wide for double-fold binding. For a 60 by 80 inch quilt, the perimeter is 280 inches plus 12 inches which equals 292 inches. Divide by 42 to get 7 strips. Each strip is 2.5 inches wide, so you need 7 times 2.5 which equals 17.5 inches or about half a yard of fabric for binding.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.