A fat quarter in quilting is a piece of fabric approximately 50cm × 55cm (20″ × 22″) — one quarter of a metre of fabric cut to give you a usable, roughly square shape rather than a long, narrow strip. Understanding what is a fat quarter in quilting, and how it differs from a fat eighth, jelly roll, charm pack, or layer cake, helps you shop confidently and choose the right fabric format before your first project begins.
That Moment in the Quilt Shop
You’ve decided to start quilting. You find your way to a fabric shop — online or in person — and discover that quilting fabric doesn’t just come off a bolt by the metre. There are bundles wrapped in ribbon, little packets of matching squares, rolled strips tied with a bow, and something simply called a “fat quarter.”
The vocabulary alone is enough to make you hesitate. What exactly is a jelly roll? How is a charm pack different from a layer cake? Can you start with a fat quarter, or do you need to buy more?
The good news: this terminology looks more complicated than it is. Quilting fabric pre-cuts are simply different ways of packaging fabric — each designed to make it easier to start a project without cutting yardage yourself. Once you understand what each format is and what it’s designed for, the quilt shop stops feeling bewildering and starts feeling like a place full of possibility.
Nothing Here Is Difficult to Understand
Before anything else: these are just names. A charm pack is not a sewing technique. A jelly roll has nothing to do with baking. A fat quarter is simply a way of cutting fabric that happens to be more useful for quilting than a straight quarter-metre cut.
Most of this terminology originated in the United States, where the quilting industry standardised certain pre-cut sizes to make it easier for customers to buy coordinating fabric collections without purchasing full bolts. British quilters have adopted the same terms, so you’ll see them used on UK quilting websites, at UK quilt shows, and in most English-language patterns worldwide.
You don’t need to memorise anything here. Read through once, and by the time you reach the end you’ll have enough understanding to shop with confidence.
Fat Quarters: The Most Useful Beginner Cut
A fat quarter is a half-metre of fabric cut in half again — but cut across the fold rather than along it.
To understand why this matters: if you buy a standard quarter-metre from a fabric shop, you receive a piece roughly 25cm × 112cm (10″ × 44″). That’s a long, narrow strip. It’s difficult to cut usable squares from. A fat quarter is cut differently — the half-metre is folded, then cut, giving you a piece that measures approximately 50cm × 55cm (20″ × 22″). Much more like a square. Much more useful for quilting.
Most beginner block patterns are designed with fat quarters in mind. A simple 12-inch patchwork block will typically use between one and three fat quarters, depending on the number of colours. The Arrowhead Puzzle block, for instance, uses three fat quarters — one in each of three tones.
How much fabric is in a fat quarter? Approximately 0.25 metres, or about 900 square centimetres of usable cutting area. Enough for several patchwork squares or a few strips, depending on the cut sizes your pattern calls for.
Fat quarter bundles are curated collections — typically six, eight, or twelve fat quarters chosen from a single fabric range to coordinate with each other. Designers release their fabric collections as fat quarter bundles precisely because quilters like to buy coordinating fabrics without having to choose which prints work together. If you see a bundle labelled “12 Fat Quarter Bundle,” each of the twelve pieces is a standard 50cm × 55cm fat quarter in a different print from the same collection.
Fat Eighths: When You Need Less
A fat eighth is exactly what it sounds like: half a fat quarter. It measures approximately 25cm × 55cm (10″ × 22″).
Fat eighths are useful when you want to introduce a colour into a project without committing to a full fat quarter. They’re often sold individually in quilt shops or as part of a larger bundle. For beginner projects, a fat eighth is usually too small to be the primary fabric — you wouldn’t have enough cutting area for most block pieces — but it works well as an accent or background colour in very small quantities.
If a pattern calls for fat quarters, you’ll typically need the full fat quarter rather than a fat eighth. Read the pattern’s materials list carefully before substituting.
Jelly Rolls: Pre-Cut Strips Ready to Sew
A jelly roll is a bundle of fabric strips — typically 2.5 inches (approximately 6.5cm) wide and 42–44 inches (approximately 107–112cm) long. Each strip runs the full width of the fabric. A standard jelly roll contains 40 strips, all from the same fabric collection, rolled and tied with a ribbon.
Jelly rolls exist because strip-piecing — sewing long strips of fabric together, then cutting across the seams — is one of the fastest and most satisfying ways to make a quilt. With a jelly roll, all the cutting is already done. You simply sew the strips together in the order or arrangement your pattern specifies.
Are jelly rolls good for beginners? Yes, if the pattern is designed for them. Jelly roll patterns are often straightforward because the strip width is consistent and the long seams are easy to sew. The limitation is that you’re working with a pre-set colour selection — the strips are all from the same collection, so you get whatever colours the designer chose. For beginners who are unsure about colour selection, this can actually be an advantage: the decision has been made for you.
The main consideration: jelly roll strips are 2.5 inches wide, which means your seam allowance leaves a very narrow finished strip (2 inches, or 5cm, after sewing). Accuracy matters more, not less, when working with strips this narrow.
Charm Packs: Ready-Cut Squares for Simple Blocks
A charm pack is a bundle of pre-cut 5-inch squares — typically 40 or 42 squares from a single fabric collection, all in different prints. Each square is 5 × 5 inches (approximately 12.5 × 12.5cm).
Charm packs are particularly beginner-friendly because the cutting is entirely done for you and the squares are already the right size for many simple block patterns. A basic “nine patch” block, for instance, uses nine small squares — easily cut from a charm pack. More complex designs can also use charm pack squares as the starting point for smaller pieces.
The limitation of a charm pack is the same as a jelly roll’s: you’re working with someone else’s colour selection. You’ll have all the prints from a single collection, which may or may not suit the project you have in mind.
Layer Cakes: Larger Squares for Bigger Projects
A layer cake is a bundle of 10-inch squares — typically 40–42 squares from a single fabric collection. They’re larger versions of charm pack squares.
At 10 inches, layer cake squares are large enough to form the basis of a wide range of quilt designs — from simple large-square quilts to more complex blocks that use the 10-inch square as the starting unit. They’re sometimes called “10-inch stackers” in US quilting communities.
For absolute beginners, layer cakes can feel a little large and unwieldy for a first project. Charm packs and fat quarters tend to be more manageable entry points. That said, some very simple quilt patterns (particularly large-square designs) are well-suited to layer cakes because the squares don’t require much additional cutting.
Choosing the Right Pre-Cut for Your First Project
With several formats to choose from, the question becomes: which is right for a first project?
Step 1: Read Your Pattern’s Materials List First
Every quilting pattern includes a materials list specifying how much of each fabric you need and in what form. If the pattern says “3 fat quarters,” buy fat quarters. If it says “1 jelly roll,” buy a jelly roll. Don’t substitute formats without understanding how the cutting instructions will be affected.
Step 2: Match the Format to Your Confidence Level
If you have a specific project in mind: buy the format the pattern calls for.
If you don’t yet have a specific project and want to explore: fat quarters are the most versatile starting point. You can cut fat quarters into squares, strips, or rectangles of almost any size, which gives you the flexibility to work with a wide range of patterns. Most beginner resources — including the free Arrowhead Puzzle Starter Kit — are designed around fat quarters.
Step 3: Consider the Colour Decision
Bundles (fat quarter bundles, jelly rolls, charm packs, layer cakes) take the colour decision away from you. This can be helpful if you find colour selection overwhelming, or if you want fabrics that are guaranteed to coordinate.
Buying fat quarters individually lets you make your own colour choices — which is also a satisfying part of the quilting process, once you feel confident doing it.
The simplest starting point: choose a fat quarter bundle in three coordinating tones — one light, one medium, one dark. This gives you everything you need for most beginner block patterns, including the Arrowhead Puzzle, without requiring you to make complex colour decisions before you’ve started.
A Note on Pre-Cut Sizes and Seam Allowances
One important consideration when working with pre-cuts: the pieces are cut precisely to the stated size, but they are not pre-trimmed for seam allowances. A charm pack square listed as 5 inches will finish at 4.5 inches once you’ve sewn a standard quarter-inch seam on each side.
Always check whether your pattern’s cutting dimensions account for seam allowances or not. Most patterns for pre-cuts do account for this — the design is created specifically for that pre-cut size and the stated block measurements will be achievable if you maintain a consistent quarter-inch seam allowance throughout.
For absolute beginners, this is one of the reasons accuracy in your seam allowance matters from the very first seam. A quarter inch off, consistently, adds up quickly across many pieces. The Quilters’ Guild of the British Isles recommends practising on a few test seams before beginning a project to check your machine’s quarter-inch foot setting or your masking tape guide — a habit worth developing early.
Frequently Asked Questions
What is a fat quarter in quilting?
A fat quarter is a piece of quilting fabric measuring approximately 50cm × 55cm (20″ × 22″). It’s one quarter of a metre of fabric, but cut differently from a standard quarter-metre: rather than a long, narrow strip (25cm × 112cm), the fabric is folded and cut to produce a more square, usable shape. Fat quarters are the most common format for buying quilting fabric by the piece, and most beginner quilting patterns are designed to work with them.
How is a fat quarter different from a regular quarter metre?
A regular quarter metre from a fabric shop is cut straight across the bolt: approximately 25cm deep and 112cm wide (10″ × 44″). A fat quarter is cut differently — the half-metre is folded and then cut, giving a piece approximately 50cm × 55cm (20″ × 22″). The total amount of fabric is the same, but the fat quarter’s shape is more useful for quilting because it allows you to cut larger squares from it.
What can you make with one fat quarter?
With a single fat quarter you have enough fabric for several patchwork blocks, depending on the size of the pieces your pattern requires. For a simple 12-inch beginner block using 3.5-inch squares, one fat quarter will yield around fifteen to eighteen squares — enough for two or three blocks. With three coordinating fat quarters (one light, one medium, one dark) you have enough to make a practice block, a small wall hanging, or a set of cushion covers.
Are jelly rolls good for beginners?
Yes, with some caveats. Jelly roll patterns are often straightforward because all the strips are the same width and the piecing is mostly long straight seams. The limitation is that your colour choices are fixed by the collection — you work with what’s in the roll. The narrow strip width (2.5 inches raw, 2 inches finished) means accuracy in your seam allowance matters more than with wider pieces. If you enjoy the idea of strip-piecing and are happy to work within a pre-chosen colour palette, a jelly roll project can be very satisfying for a first or second quilt.
What is the difference between a charm pack and a layer cake?
Both are bundles of pre-cut squares from a single fabric collection. A charm pack contains 5-inch squares (approximately 40–42 per pack), while a layer cake contains 10-inch squares (approximately 40–42 per pack). Charm packs are better suited to smaller projects and detailed patchwork. Layer cakes work well for larger, simpler designs where the bigger square size is an advantage. Both take the cutting work away from you and provide a pre-coordinated colour palette.
The Quilt Shop Is on Your Side
Fabric shops stock fat quarters, jelly rolls, and charm packs because they want quilters — especially beginners — to be able to start confidently without buying more fabric than they need or puzzling over how to cut a full bolt. These formats exist to make your first project easier, not to add complexity.
The next time you find yourself in front of a display of coordinated fat quarter bundles, you’ll know exactly what you’re looking at. And the choice of which one to take home — that’s the fun part.
If you’d like to put your first fat quarter to use, the free Arrowhead Puzzle Starter Kit is a good starting point. It’s a beginner block designed for three fat quarters, with a downloadable pattern and step-by-step tutorial video. A real project, taught properly, completable in an afternoon.
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