California King Quilt Size and Fabric
California King quilt backing, calculated live
This is the backing calculator preloaded with the standard california king quilt (104" x 100"). Adjust any number to match your actual quilt; the answer updates instantly.
You will need
Everything a california king quilt needs
Fabric requirements for a 104" x 100" 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 | 9 yards (3 panels) | Backing calculator |
| Backing, 108" wide | 6 yards (2 panels) | Backing at 108" |
| Binding, 2 1/2" strips | 11 strips, 1 yard (418" of binding) | Binding calculator |
| Batting | 112" x 108" needed; buy King (120" x 120") | Batting calculator |
| Precuts (top only) | about 4 jelly rolls or 13 charm packs | Precut calculator |
The short answer
A California King quilt is typically 104" x 100", fitting the 72" x 84" Cal King mattress, which is 4" narrower and 4" longer than a standard king. It takes 9 yards of 42" backing in three panels, 3 1/4 yards of 108" wide backing run sideways, a full yard of binding, and the king batting package.
Narrower and longer: the four inch identity
The California King is not a bigger king; it is a rotated priority. The mattress trades 4" of width for 4" of length (72" x 84" against the king's 76" x 80"), built for tall sleepers whose feet hang off standard beds. The quilt follows: 104" x 100" is nearly square, the closest of all the big sizes. Everything that goes wrong with Cal King bedding goes wrong because someone assumed king and Cal King were interchangeable. They share a batting package and nothing else.
The mislabeled bedding capital of the world
No size suffers more wrong purchases. Store comforters labeled king come up short at the foot of a Cal King; Cal King sheets balloon sideways on a standard king. A custom quilt is the permanent fix, which is much of why Cal King owners commission quilts at all: measuring the actual bed and entering the numbers above ends a decade of bedding roulette. If you are making this quilt for someone else, confirm which king they own before cutting; the conversation takes one text and saves a hundred dollars of fabric.
Backing math in the near-square zone
The 112" x 108" backing requirement makes standard cotton a three panel, 9 yard affair, the largest backing buy on this site. On 108" wide fabric, railroading saves the day again: run sideways, a single 3 1/4 yard panel covers it, two yards less than instinct budgets. The near-square shape means the two orientations differ less here than on any other large quilt; the calculator checks both directions and quietly picks the winner.
California King questions, answered
Sideways logic says almost: the king quilt's 110" width over-covers the narrower Cal King mattress, but its 95" length runs 5" short on the longer mattress, shorting the foot drop or the pillow tuck. It functions; it never quite fits. For a bed someone sleeps in nightly, the 4" of length is worth making properly.
The 84" mattress is exactly 7 feet, the only standard size that fully contains a sleeper over about 6'2" without diagonal strategies. The bed (and this quilt) are most common on the West Coast, hence the name, but the length problem they solve is universal among the tall.
Mixed, interestingly: more standard backing (9 yards against 8 3/4, the length costs you) but less wide backing (3 1/4 against 3 1/2, the narrower width railroads cheaper). Binding is the same 11 strips; batting is the same king package. The two kings are siblings who split the bills differently.
Measure the mattress width: 76" is a standard (Eastern) king, 72" is a California King. If the tape measure is unavailable, ask whether the owner's feet hang off hotel beds; a yes is circumstantial evidence for Cal King. The tape measure remains the gold standard of quilt diplomacy.
The bottom line
One hundred four by one hundred: the tall sleeper's quilt, four inches narrower and four longer than a king, perpetually mislabeled in stores and perfectly solved by a tape measure and this calculator. Same batting package as the king; nothing else interchangeable.