The Formula for Backing Calculator for Quilts
The formula to calculate the fabric needed for quilt backing depends on the dimensions of the quilt and the width of the fabric available. Here is the formula:
- Quilt Backing Fabric (yards):
Backing Fabric (yards)=[{Quilt Height (inches) / Fabric Width (inches) }× Quilt Width (inches) ] ÷ 36 - Adjust the fabric length for seams and shrinkage if needed.
Table of Contents
What is Quilt Backing?
Quilt backing is the fabric layer on the back of your quilt. It provides structure, stability, and visual appeal to the finished project. Choosing the correct size for the backing is essential to ensure a flawless quilting experience.
Creating beautiful quilts involves precise measurements and fabric calculations. A quilt backing calculator simplifies the process of determining the fabric required to cover the back of your quilt seamlessly.
Why Use a Backing Calculator?
Using a backing calculator saves time and ensures accuracy when calculating the required fabric for your quilt. This tool helps avoid costly mistakes by providing exact measurements for both standard and custom quilt sizes.
Materials Needed for Quilt Backing Calculation
- Measuring tape or ruler
- Quilt top dimensions
- Calculator (or an online backing calculator)
- Fabric information (width and pattern repeat if applicable)
Step-by-Step Guide to Calculate Quilt Backing
Step 1: Measure Your Quilt Top
Start by measuring the length and width of your quilt top. Record these dimensions accurately as they form the foundation for your backing calculation.
- Length (L): Measure from top to bottom.
- Width (W): Measure from side to side.
Step 2: Add Extra Fabric for Quilting Allowance
To accommodate quilting and fabric shrinkage, add at least 8 inches to both the length and width measurements.
Example Calculation:
- Quilt top size: 60 inches by 80 inches
- Add 8 inches to length and width:
- Length: 60 + 8 = 68 inches
- Width: 80 + 8 = 88 inches
Step 3: Determine Fabric Width
Standard fabric widths typically range from 42 to 44 inches. Choose a fabric width that fits your project needs.
Step 4: Calculate the Number of Fabric Panels
If your quilt width exceeds the fabric width, you’ll need multiple panels sewn together.
Formula:
Number of Panels= ⌈Quilt Width / Fabric Width⌉
Example:
- Quilt width: 88 inches
- Fabric width: 44 inches
- Number of panels: ⌈88 / 44⌉=2
Step 5: Calculate Total Fabric Length
Multiply the number of panels by the quilt length to get the total fabric length required.
Example:
- Number of panels: 2
- Quilt length: 68 inches
- Total fabric length: 2 x 68 = 136 inches
Step 6: Convert to Yards
Fabric is typically sold by the yard. Convert inches to yards by dividing by 36.
Formula:
Yards Required = Total Inches / 36
Example:
- Total fabric length: 136 inches
- Yards required: 136/36≈3.78
- Round up to 4 yards
Step 7: Account for Pattern Matching (Optional)
If your fabric has a repeating pattern, add extra fabric for matching the pattern across panels.
Step 8: Finalize Your Calculation
Ensure you have enough fabric by rounding up and considering any additional allowance for errors.
Tips for Choosing Quilt Backing Fabric
- Fabric Type: Choose durable and soft fabrics like cotton.
- Color and Pattern: Select colors and patterns that complement the quilt top.
- Seam Placement: Plan seams to minimize their visibility.
Common Mistakes to Avoid
- Incorrect Measurements: Always double-check your quilt dimensions.
- Ignoring Shrinkage: Prewash your fabric to account for shrinkage.
- Underestimating Fabric Needs: Round up your calculations to avoid running out of fabric.
Conclusion
A backing calculator for quilts simplifies the task of measuring and cutting fabric for your quilt backing. By following this guide, you can ensure accurate calculations and enjoy a hassle-free quilting experience. Happy quilting!