Twin Quilt Size and Fabric Guide
Twin quilt backing, calculated live
This is the backing calculator preloaded with the standard twin quilt (70" x 90"). Adjust any number to match your actual quilt; the answer updates instantly.
You will need
Everything a twin quilt needs
Fabric requirements for a 70" x 90" quilt, computed with the longarm standard of 4" overhang and 2 1/2" binding strips. Each row links to its calculator preloaded with these dimensions, ready to adjust.
| Supply | You need | Fine-tune it |
|---|---|---|
| Backing, 42" fabric | 5 1/2 yards (2 panels) | Backing calculator |
| Backing, 108" wide | 2 1/4 yards (1 panel) | Backing at 108" |
| Binding, 2 1/2" strips | 9 strips, 3/4 yard (330" of binding) | Binding calculator |
| Batting | 78" x 98" needed; buy Queen (90" x 108") | Batting calculator |
| Precuts (top only) | about 2 jelly rolls or 8 charm packs | Precut calculator |
The short answer
A twin quilt is typically 70" x 90", giving a 38" x 75" twin mattress a 16" drop on each side and 15" at the foot. It takes 5 1/2 yards of 42" backing in two panels, a 3/4 yard of binding, and, counterintuitively, a queen size batting package once the longarm overhang is counted.
The first real bed quilt
The twin is where quilting graduates from furniture accessories to bedding. A twin mattress is only 38" wide, but bunk beds, daybeds, and kids' rooms demand a quilt that tucks and drapes properly, so the standard adds a generous 16" of drop per side. The result covers the mattress sides completely and survives the nightly tornado of a child sleeper. Twins are also the classic graduation and camp quilt, big enough to matter, small enough to finish before the deadline.
The queen batting surprise
Here is the trap this page exists to spring before the store does: a twin quilt headed to a longarmer needs 78" x 98" of batting, and the twin package is 72" x 90". Six inches short in width, eight in length. The full package misses too. The first package that genuinely covers it is the queen at 90" x 108". Quilters buy twin batting for twin quilts on pure reflex, and longarmers receive the apologetic phone calls weekly. Buy the queen; the trimmings will halfway bat a baby quilt.
Backing the twin economically
At 78" of needed width, the twin backing wants two vertical panels of 42" fabric, 5 1/2 yards total, with one centered seam running the quilt's length. On 108" wide backing it is a single 2 1/4 yard panel cut sideways, no seam at all. The wide backing usually wins on total cost here, and always wins on the evening of your life you do not spend wrestling a 98" seam.
Twin quilt questions, answered
It will cover it, but 5" shorter than ideal: the XL mattress is 80" long against the standard twin's 75". On a dorm bed the standard twin quilt either shorts the pillow tuck or the foot drop. If the bed in question is a dorm bed, make the twin XL (70" x 95"); the extra 5" of length costs about a third of a yard of fabric per layer.
A 5 x 7 grid of 12" blocks gives 60" x 84"; add a 5" border and you land at 70" x 94", squarely in twin territory. With 2" sashing instead, 5 x 7 reaches 68" x 96" before any border. Thirty five blocks is the classic block-of-the-month year with change.
Manageable, with caveats: it is the size where quilting your own work becomes a physical negotiation with the harp space. Straight lines and an extension table keep it civilized. Many quilters draw their personal longarm line exactly here: throws and smaller at home, twins and up to the professional.
Roughly 12 to 14 total yards across top, backing, and binding at this size. At typical quilt shop prices that is a real number, which is why the twin is where quilters discover sales, wide backing economics, and the gentle art of stash shopping. The quilt is still cheaper than the therapy it replaces.
The bottom line
Seventy by ninety, the first true bed quilt, with one commandment: buy queen batting, not twin. The package name and the quilt name agree on nothing once overhang enters the math.