Fat Quarter Calculator
How much fabric do your fat quarters give you? Find the total area and yardage equivalents in seconds.
Tip: use URL parameters, e.g. ?fqCount=8.
What is a fat quarter?
A fat quarter is a quarter-yard of fabric cut the "fat" way: instead of a narrow 9" × 44" strip, it's cut 18" × 22" (roughly half the width, half the length of a yard). The shape is much more useful for cutting multiple pieces.
The area math. One standard fat quarter is 18 × 22 = 396 square inches. A regular quarter-yard strip of 44"-wide fabric is 9 × 44 = 396 square inches — exactly the same area! So one fat quarter always equals one quarter-yard of fabric by area.
Planning a quilt with FQs. A layer cake of fat quarters is a popular way to buy variety. For example, 8 fat quarters give you 8 × 396 = 3,168 square inches — about the fabric you'd need for a small throw top, depending on your block design.
Fat eighths. Some shops also sell fat eighths (9" × 22", half a fat quarter). Adjust the width and length fields to match whatever cut you bought.
What each input means
- Number of fat quarters — how many precuts you own or plan to buy.
- Fat quarter width and length (inches) — the actual dimensions of your precuts. The standard is 18" × 22", but shops cut slightly differently, so edit these to match what you have.
The result shows total area and its equivalent in yards of 44"-wide fabric. Use it to compare a fat-quarter bundle against buying yardage, or to sanity-check whether your stack covers the fabric area your pattern needs.
When to use it. Use this calculator when comparing precut bundles against yardage, or when a pattern tells you how many fat quarters to buy and you want to check the total area before committing. It's also useful when a shop's fat quarters run smaller than standard — adjusting the width and length fields keeps your planning honest. Keep in mind the tool reports area, not whether specific block sizes fit the 18" dimension; you'll still want to sketch the cutting layout for the actual pieces.
Common mistakes to avoid
- Assuming every fat quarter is 18" × 22". Some shops cut 18" × 21" or trim selvedges tighter. Measure your actual precuts and enter those numbers.
- Treating a fat eighth as a fat quarter. A fat eighth is half the area (9" × 22"), so entering it as a fat quarter doubles your estimate.
- Using area alone for directional prints. Stripes and one-way motifs can't be rotated freely, so usable area drops even though the math looks fine.
- Forgetting the selvedges are already trimmed. That's a plus, but the cut dimensions can vary by shop, which is why measuring matters.
- Expecting the calculator to check layout fit. Area tells you how much fabric you have, not whether your block sizes fit the fat quarter's 18" dimension — plan the cutting layout separately.
Frequently asked questions
How much fabric is one fat quarter?
One standard fat quarter (18" × 22") equals 396 square inches — the same area as a quarter-yard of 44" fabric, just cut in a more useful shape.
How many fat quarters do I need for a quilt?
For a simple throw top (about 3,500-4,000 sq in), 9-10 fat quarters with borders and a solid background is a common starting point.
Are fat quarters a good deal?
Per square inch they're usually priced slightly higher than yardage because of the extra cutting and packaging, but the convenience and variety are worth it for scrap-style quilts.
Can I cut fat quarters into 5-inch charm squares?
Yes — one 18" × 22" fat quarter yields 12 five-inch squares (3 across × 4 down), with a little leftover.