Figuring out how much fabric you need for cushion covers depends on the cushion’s size, shape, and whether you want to add piping or a zipper. Generally, for a standard square or rectangular cushion, you’ll need enough fabric to cover both sides plus extra for seams and any embellishments.
How Much Fabric Do You Really Need for Cushion Covers?
Calculating the right amount of fabric for cushion covers can seem daunting, but it’s quite manageable with a little planning. Understanding the basic measurements and considering design elements like piping or pleats will help you avoid costly mistakes and fabric waste. This guide will walk you through the process, ensuring you have enough material for your DIY cushion projects.
The Basics: Measuring Your Cushion
Before you buy any fabric, the first crucial step is to accurately measure your cushion. You’ll need two primary measurements: the width and the height (or length) of the cushion. For standard square cushions, these will be the same.
For rectangular cushions, measure the width across the longest side and the height across the shorter side. It’s also essential to account for the cushion’s depth, as this will influence how much fabric is needed to wrap around the sides.
Calculating Fabric for Simple Square or Rectangular Cushions
Let’s break down the fabric calculation for a basic cushion cover. This method assumes a simple envelope closure or a zipper on one side, with no extra embellishments like piping.
Formula for a Basic Cushion Cover:
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Fabric for Front and Back: Measure the width and height of your cushion. Add 1 inch to both measurements for seam allowances (½ inch on each side). So, for the front piece, you’ll need (Cushion Width + 1 inch) x (Cushion Height + 1 inch). Do the same for the back piece.
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Fabric for the Sides (if applicable): If your cushion cover will have a separate band around the sides, you’ll need to calculate that. The length of this band will be the perimeter of your cushion (2 x Cushion Width + 2 x Cushion Height). The width of the band will be the cushion’s depth plus 1 inch for seam allowances.
Example:
Imagine you have a cushion that is 18 inches wide and 18 inches high, with a depth of 4 inches.
- Front Piece: (18 + 1) inches x (18 + 1) inches = 19 inches x 19 inches
- Back Piece: (18 + 1) inches x (18 + 1) inches = 19 inches x 19 inches
- Side Band:
- Length: (2 x 18) + (2 x 18) = 36 + 36 = 72 inches
- Width: (4 + 1) inches = 5 inches
- So, you’d need a piece that is 72 inches long and 5 inches wide.
When laying out your fabric, remember to consider the grainline of the fabric. For most cushions, you’ll want the grainline to run parallel to the bottom edge of the cushion.
Adding Extra Features: Piping and Zippers
Piping and zippers add a professional touch but require a bit more fabric. Let’s see how they impact your calculations.
Fabric for Piping
Piping is a corded trim that outlines the edges of the cushion. You’ll need to create bias strips to cover the cording.
- Bias Strips: For piping, you’ll need to cut strips of fabric on the bias (at a 45-degree angle to the selvage). The width of these strips depends on the thickness of your cording. A common width is 2 to 2.5 inches.
- Length of Bias Strips: You’ll need enough bias strips to go around the entire perimeter of your cushion. So, the total length required is the cushion’s perimeter (2 x Cushion Width + 2 x Cushion Height).
Example (Continuing from above):
For an 18×18 inch cushion with a 4-inch depth:
- Perimeter = 72 inches.
- If you cut bias strips at 2.5 inches wide, you’ll need a total length of 72 inches of fabric that is 2.5 inches wide. You might need to piece together several shorter strips to achieve this length.
Fabric for Zippers
If you’re adding a zipper, you’ll typically install it along one edge of the cushion cover. This usually doesn’t add significant fabric requirements beyond the standard pieces, but you need to account for the seam allowance where the zipper will be inserted.
- Zipper Placement: For an envelope closure, you’ll have two overlapping back panels. The overlap needs to be generous enough to accommodate the zipper and provide a clean finish. This overlap is usually around 4-6 inches.
Example (Envelope Closure):
For an 18×18 inch cushion:
- Front Piece: 19 inches x 19 inches
- Back Panels: You’ll need two panels. Each panel’s width would be half the cushion’s width plus an overlap. So, (18 / 2) + 4 inches = 9 + 4 = 13 inches. The height would be the cushion’s height plus seam allowance: 18 + 1 = 19 inches. So, you’d need two panels, each 13 inches x 19 inches.
How Much Fabric to Buy: A Practical Guide
When purchasing fabric, it’s always wise to buy a little extra than your exact calculation. This accounts for:
- Pattern Matching: If your fabric has a large or directional pattern, you’ll need extra to ensure the pattern aligns correctly on all sides of the cushion.
- Mistakes: Even experienced sewers can make mistakes. Extra fabric provides a buffer.
- Pre-washing: Many fabrics shrink when washed. Pre-washing your fabric before cutting can prevent your finished cushion cover from being too small.
A general rule of thumb is to add 10-15% extra fabric to your total yardage.
Fabric Yardage Calculator (Simplified)
Here’s a quick way to estimate yardage for common cushion sizes, assuming a standard fabric width of 54 inches. This is a general guideline and may need adjustment based on your specific cushion and fabric.
| Cushion Size (Inches) | Fabric Needed (Yards) – Basic Cover | Fabric Needed (Yards) – With Piping |
|---|---|---|
| 16 x 16 | 0.5 | 0.75 |
| 18 x 1
