Backing Math Made Easy
Meet the new Justin Fabric Quilt Backing Calculator — built to help you figure out exactly how much backing fabric your quilt needs.
One of the most common questions quilters have is:
Whether you're making a baby quilt or a king-size masterpiece, backing yardage can get confusing quickly — especially when you're deciding between 108" wide-back fabric and regular quilting cotton.
That’s why I’m excited to introduce the new Justin Fabric Quilt Backing Calculator .
No More Guesswork
Simply enter your finished quilt width, finished quilt length, and preferred backing overage. The calculator defaults to 5 inches of overage per side, which is preferred by many longarm quilters, but you can adjust it to match your quilter’s requirements.
The calculator shows you:
Shop With Confidence
The calculator doesn’t stop at the math. Once you know exactly how much backing you need, you can shop available backing fabrics and add the correct amount directly to your cart.
No conversions. No second-guessing. No trying to remember how many quarter-yard increments equal 2.5 yards.
Ready to calculate your backing?
Try the Quilt Backing CalculatorWhy We Built It
I wanted to create a tool that would actually make quilt planning easier.
A lot of quilting calculators are confusing, overly technical, or still leave you doing extra math before you're ready to order fabric. I wanted something simpler:
Built for Accuracy
The Quilt Backing Calculator uses dedicated calculation logic rather than estimated answers. It compares both 108" wide-back fabric and regular-width quilting cotton so you can make a confident decision before purchasing.
Whether you're quilting at home or sending your project to a longarm quilter, the goal is simple: help you buy the right amount the first time.
More Quilting Tools Are Coming
The Quilt Backing Calculator is just the beginning.
I’m working on more tools designed to make quilting and fabric shopping easier.
My goal is to make Justin Fabric more than a place to buy fabric. I want it to be a place where quilters can find trusted tools, helpful resources, and beautiful fabrics all in one place.
I hope you'll give the Quilt Backing Calculator a try and let me know what you think. Many of the best ideas at Justin Fabric have come directly from customer feedback, and this new tool is just the beginning. My goal is to build a growing collection of free quilting tools that make planning your projects easier and shopping more enjoyable. If there's a calculator, planning tool, or feature you'd love to see next, please let me know. Together, we're building these tools with quilters, for quilters.
Happy quilting!
Justin Law
Owner, Justin Fabric LLC
