Quilt Calculator
Calculate how much fabric you need for quilt backing and batting. Enter your quilt dimensions below to get accurate fabric requirements for your quilting project.
Your Fabric Requirements
Fabric Breakdown
| Measurement | Value |
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Table of Contents
What is Quilt Batting?
Quilt batting (also called wadding) is the soft, fluffy material that goes between the quilt top and backing. It provides warmth, loft, and dimension to your finished quilt. Batting comes in various materials, thicknesses, and weights, each offering different characteristics for your quilting project.
The batting you choose affects how your quilt feels, how it drapes, how warm it is, and how it quilts. Cotton batting creates a flatter, more traditional look, while polyester batting provides more loft and warmth.
Batting Characteristics
- Loft - The thickness/puffiness of the batting
- Drape - How well the quilt conforms to your body
- Shrinkage - How much it shrinks after washing (creates crinkle effect)
- Bearding - Tendency of fibers to migrate through fabric
- Quilting distance - Maximum space between quilting lines
What is Quilt Backing?
Quilt backing is the fabric that forms the back of your quilt. It sandwiches the batting together with the quilt top. Backing fabric should be 3-4 inches larger than your quilt top on all sides to allow for fabric shifting during quilting.
Backing can be made from a single piece of wide fabric or pieced together from standard-width quilting cotton. Many quilters choose to create decorative pieced backings that add interest to the reverse side of the quilt.
How to Calculate Backing for a Quilt
Calculating quilt backing involves determining how much fabric you need based on your quilt dimensions and fabric width. Here's the process:
For 44" fabric: Yards = (Length of each panel × Number of panels) / 36
Step-by-Step Process
- Determine finished quilt size - Measure or plan your quilt top dimensions
- Add overhang - Add 3-4 inches to each side (6-8 inches total to width and height)
- Check if piecing is needed - If backing width exceeds your fabric width, you'll need to piece
- Calculate panels - Divide total width by usable fabric width
- Calculate yardage - Multiply panel length by number of panels, then divide by 36
Example Calculation
Quilt: 60" × 80" queen-size quilt
Fabric: 44" wide quilting cotton
Extra border: 4" on each side
- Backing size needed: 68" × 88"
- 68" width > 44" fabric, so we need 2 panels
- Each panel: 88" long (2.44 yards)
- Total fabric: 2 panels × 88" = 176" = 4.89 yards
- Buy 5 yards to be safe
How Much Fabric Do I Need?
The amount of fabric you need depends on your quilt size and the width of your backing fabric. Here's a general guide:
| Quilt Size | Dimensions | 44" Fabric Needed | 108" Wide Backing |
|---|---|---|---|
| Crib | 36" × 52" | 3.5 yards | 1.75 yards |
| Throw | 50" × 65" | 4 yards | 2 yards |
| Twin | 54" × 75" | 4.5 yards | 2.25 yards |
| Full | 60" × 80" | 5 yards | 2.5 yards |
| Queen | 78" × 80" | 7.5 yards | 2.5 yards |
| King | 80" × 90" | 8 yards | 2.75 yards |
Batting Types Comparison
| Type | Loft | Warmth | Max Quilting Distance | Best For |
|---|---|---|---|---|
| Cotton | Low | Medium | 2-4 inches | Traditional look, hand quilting |
| Polyester | High | High | 4-6 inches | Puffy quilts, wall hangings |
| Wool | Medium | High | 3-4 inches | Warmth, breathability |
| Bamboo | Low-Medium | Medium | 4-6 inches | Eco-friendly, silky feel |
| Cotton/Poly Blend | Medium | Medium | 3-4 inches | Easy care, machine quilting |
Standard Quilt Sizes
| Quilt Type | Width | Length | Drop (each side) |
|---|---|---|---|
| Wall Hanging | 36" | 36" | N/A |
| Crib | 36" | 52" | 10" |
| Throw | 50" | 65" | N/A |
| Twin | 54" | 75" | 12" |
| Full/Double | 60" | 80" | 15" |
| Queen | 78" | 80" | 15" |
| King | 80" | 90" | 18" |
| California King | 72" | 90" | 18" |
Tips for Perfect Backing
- Always add extra - Add 3-4 inches on each side for quilting margin
- Press well - Remove all wrinkles before basting
- Consider wide backing - 108" wide fabric eliminates seams
- Match weight - Use similar weight fabric for top and backing
- Press seams open - If piecing, press seams open to reduce bulk
- Pre-wash - Pre-wash backing fabric to prevent shrinkage surprises
- Check grain - Keep fabric grain aligned to prevent distortion
Frequently Asked Questions
How much bigger should backing be than the quilt top?
Your backing and batting should be 3-4 inches larger than your quilt top on ALL sides. This means 6-8 inches larger in total width and height. This extra fabric allows for shifting during quilting and provides fabric for the longarm quilter to clamp.
Can I use a bedsheet for quilt backing?
While possible, bedsheets are not recommended. They're typically made from tightly woven fabric that's difficult to quilt through and may not breathe as well as quilting cotton. Purpose-made backing fabric or quilting cotton produces better results.
Do I need to pre-wash batting?
Most modern battings don't require pre-washing. However, if you want to avoid any potential shrinkage or achieve a crinkled vintage look, you can pre-wash certain battings. Check the manufacturer's instructions for your specific batting.
How do I piece backing fabric?
Cut panels to the required length, remove selvages, then sew panels together with a 1/2" seam. Press seams open to reduce bulk. For horizontal seams, sew across the width; for vertical seams, sew along the length.
What's the difference between horizontal and vertical backing seams?
Horizontal seams run across the quilt width, while vertical seams run along the length. Horizontal seams typically require less fabric because you're cutting panels equal to the backing width rather than length.