A standard quarter round molding measures 3/4 in. x 3/4 in., because a true quarter-round profile has equal width and depth.
Baseboard gaps and floating floors both hide behind the same small strip, and the wrong width leaves a shadow line no caulk will fix. When a product is sold as quarter round molding, the two numbers on the label are identical by design, and the first tells you how wide it sits against the wall. A quarter round molding size chart makes the decision a ten-second read.
What Size Is Quarter Round Molding?
The most common quarter round molding size is 3/4 in. x 3/4 in., found across manufacturer catalogs and big-box retail listings. Metrie lists sizes from 1/4 in. x 1/4 in. up to 15/16 in. x 15/16 in., so 3/4 in. sits near the top of the standard range.
Home Depot carries 3/4 in. x 3/4 in., 11/16 in. x 11/16 in., 5/8 in. x 5/8 in., and 1/2 in. x 1/2 in., covering most U.S. residential jobs. Niche catalog models include 1 x 1, 7/16 x 7/8, and 5/16 x 5/16.
Quarter round is sold by common size, but actual measurements can differ. A piece listed as 3/4 in. x 3/4 in. commonly measures 0.75 in. x 0.75 in. actual, but nominal labels and real dimensions do not always match across brands. Measure the piece, not the tag.
| Common Size | Visible Width | Where It Fits |
|---|---|---|
| 1/4 in. x 1/4 in. | About 1/4 in. on each face | Thin, low-profile trim and small gaps |
| 1/2 in. x 1/2 in. | About 1/2 in. on each face | Standard baseboards with modest gaps |
| 5/8 in. x 5/8 in. | About 5/8 in. on each face | Mid-size baseboard profiles |
| 11/16 in. x 11/16 in. | About 11/16 in. on each face | Taller baseboards and wider floor gaps |
| 3/4 in. x 3/4 in. | About 3/4 in. on each face | The most common residential choice |
| 15/16 in. x 15/16 in. | About 15/16 in. on each face | Heavy trim and large transitions |
| 1 in. x 1 in. | About 1 in. on each face | Oversized baseboards and bold trim |
How Wide It Is Compared To How Tall
For a true quarter round profile, width and height are the same number — that is why the size is always two matching figures. Bob Vila describes quarter round as roughly 1/2 inch to 3/4 inch tall with matching depth and width.
This equal-sided geometry separates quarter round from shoe molding, which is taller than it is deep. Measure both faces: equal faces mean quarter round; taller-than-deep means shoe molding. Buying the wrong one is a common mistake and shows up as a strip that refuses to sit flush.
Length is a separate decision. Quarter round comes in 8-ft and 12-ft lengths, including 3/4 in. x 3/4 in. x 8-ft and 11/16 in. x 11/16 in. x 12-ft. Metrie notes lengths up to 16 ft, which cuts down on seams in long rooms.
Choosing The Right Width
Match the quarter round size to the baseboard, not the floor. Metrie’s guidance: size depends on adjacent finishing dimensions, especially baseboard height. A 1/2 in. strip under a tall baseboard looks undersized; a 3/4 in. strip under a short baseboard can overwhelm the wall. Two checks before buying:
- Measure the gap you need to hide. The visible face must cover it completely with a little overlap.
- Compare the strip’s face against the baseboard’s face. Roughly proportional reads as intentional; a big mismatch reads as an afterthought.
For thicker baseboards or oversized trim, a wider profile fits better, and our tested roundup of 1 inch quarter round molding picks covers those options. Prices and SKU availability shift by store and season, so confirm both before a full-room order.
Because the profile is equal-sided, the label does the work once you know what to look for. Verify actual measurement against common size, match width to baseboard height, and the strip sits the way it should. The table above is the only reference you need in the aisle.
FAQs
Is quarter round always the same on both faces?
Yes, for true quarter round profiles depth and width are equal, which defines the shape. Bob Vila notes quarter round runs about 1/2 inch to 3/4 inch tall with matching depth and width. If a strip is taller than it is deep, you are holding shoe molding, and it will not sit the same way.
What is the widest quarter round you can buy?
Metrie lists sizes up to 15/16 in. x 15/16 in., and catalog models go as large as 1 x 1. Most stores stock 3/4 in., 11/16 in., 5/8 in., and 1/2 in., so anything wider is usually a special order.
Do common size and actual size always match?
Not always, but usually for quarter round. A 3/4 in. x 3/4 in. common size typically equals 0.75 in. x 0.75 in. actual. Retailers list both because nominal labels and real dimensions can drift between brands. Bring a tape measure and check the piece itself.
References & Sources
- Metrie. “Quarter Round Molding & Trim: What Is, Sizes & Dimensions” Supports the size range from 1/4 in. to 15/16 in., 16-ft lengths, and the rule that size depends on adjacent trim dimensions.
- Home Depot. “Quarter Round – Floor Moulding” Source for retail quarter round sizes, including 3/4 in., 11/16 in., 5/8 in., and 1/2 in. profiles.
- Bob Vila. “13 Types of Molding” Supports the 1/2 inch to 3/4 inch height range, equal depth and width for quarter round, and the distinction from shoe molding.
