Input Measurements
Live Auto-Calculation
Output Summary
Verified Spec
Calculating...
Initial output value
Plate Cut Dimensions
19.0" × 19.0" (4 plates)
Cutting Nest Layout
2 plates / row on 54" roll
Closure Specification
Hidden Bottom Zipper
Piping Welting Allowance
Knife Edge (No piping)
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How to Use the Throw Pillow & Cushion Fabric Calculator
- Select your desired options and garment / fabric specifications from the input fields above.
- Enter your measurements with high precision using the labeled unit selectors (inches, centimeters, or grams).
- Review the live calculation summary in the prominent result card to confirm fabric yardage, cuts, or conversions.
- Use the "Copy Specification" button to save your cutting specification to your tech pack or pattern notes.
Documented Textile Industry Formula
Throw Pillow Cutting & Yield Formulas
- 1. Plate Cut Size: For an 18" pillow insert, cut front and back plates at 19" × 19" (using 0.5" seam allowance gives a plump fit).
- 2. Envelope Back: Cut back in two pieces with 4-inch overlap.
- 3. Nesting Yield: Across 54" fabric, two 19" plates fit side by side (38" < 54").
- 4. Continuous Bias Piping: Perimeter = (Width + Height) × 2 + 6" join allowance.
Worked Calculation Example
Real-World Scenario: Making a pair of 2 (two) 18" × 18" throw pillows with hidden zippers on 54" fabric.
- • Plate Cut Size = 19" × 19" (front and back)
- • Plates Required = 4 plates total (2 front, 2 back)
- • Layout: 2 plates fit side-by-side across 54" width (19" + 19" = 38")
- • Length Required = 2 rows × 19" = 38 inches ➔ 1.06 Yards
You need approximately 1.15 to 1.25 yards of 54" fabric for 2 zippered pillows.
Frequently Asked Questions
What size fabric do I cut for an 18x18 pillow insert?
For an 18×18 inch pillow insert, cut your fabric plates exactly 19×19 inches. When sewn with a 1/2-inch seam allowance, the finished cover will measure 18×18 inches, ensuring a crisp, plump, professional fill.
How many pillows can I get out of 1 yard of 54 inch fabric?
For 16×16 inch pillows, you can get 2 complete zippered pillows (4 plates) from 1 yard of 54-inch fabric. For 18×18 pillows, you need approximately 1.15 to 1.25 yards for two pillows.
How much extra fabric does envelope closure take?
Envelope backing requires two overlapping fabric panels (typically overlapping by 3 to 4 inches), adding about 20% to 30% more fabric than a simple hidden zipper installation.