--- title: "Quarter Circle Floor Cushion: What the Listed Size Measures" url: "https://cushionguide.com/answers/corner-floor-cushion-quarter-circle-size/" section: "The Cutting Table" author: "Rosa Delgado, The Porch Keeper of Savannah" author_url: "https://cushionguide.com/masters/rosa/" published: "2026-09-15" updated: "2026-09-24" keywords: "quarter circle floor cushion, corner floor cushion size, corner floor cushion, kids corner sofa cushion, half circle floor cushion" --- # Is the corner floor cushion a quarter circle, and what does the size measure? *Folks lay a tape along the curve and then wonder why the numbers don't match. The size lives on the two straight sides that hug the walls.* Also asked as: Is its shape a quarter circle?; What do the measurements actually measure? > **The quick answer:** The corner floor cushion is a quarter circle, and its listed size is the length of the two straight edges, the radius, not the curved front. The kids corner sofa cushion already measures 39 in (100 cm) along each straight side. Two quarter circles pushed together make a half circle against a flat wall; send a photo of the space and the workshop confirms the fit. ![Baby stacking rainbow rings on a sage corduroy corner floor cushion under a cream canopy, toddler playing on jute rug](https://cushionguide.com/media/corner-floor-cushions/sage-corduroy-corner-cushion-baby-toddler-play-1536.webp "The cushion is low enough for a baby to sit on top while an older sibling kneels beside it on the rug.") ## Key facts - The corner floor cushion is a quarter circle, offered in several sizes. - The listed size is the length of each straight edge (the radius), not the curve. - The kids corner sofa cushion measures 39 in (100 cm) along its straight sides. - Two quarter-circle corner cushions placed together form a half circle against a flat wall. - The workshop checks a photo of your space and confirms the fit. - Photos comparing close colors, such as lavender, indigo and blue, are sent on request. ## Measure the straight sides, never the curve Neighbor, this one trips up a lot of good people. The corner floor cushion is a true quarter circle: two straight sides that meet at a right angle and tuck into the corner, and one rounded front that faces the room. When a listing gives a size, it means those **straight sides**, the radius. Not the curve. The curved edge is always longer than either straight one, so a tape laid along it hands you a bigger number that matches nothing the workshop cut. Measure out from the corner along each wall and that's your size. The [corner floor cushion Atlas](https://cushionguide.com/cushions/corner-floor-cushions/) shows the shapes side by side, the [quarter circle sizing Pattern](https://cushionguide.com/guides/corner-floor-cushion-quarter-circle-size/) goes deeper, and the glossary keeps a plain definition under [corner floor cushion](https://cushionguide.com/glossary/#corner-floor-cushion). ## The next message: can two of them make a half circle? Once the shape makes sense, the follow-up is nearly always about doubling up. Put two quarter circles together, straight edge to straight edge, and you get a half circle that sits flat against one wall. That makes a generous reading spot, and a soft landing for little ones who haven't mastered stopping. Kids and dogs are the real quality control. Send a photo of the wall and floor you have in mind, and the workshop confirms it will work before you order. Torn between lavender, indigo and blue? Ask, and the shop sends photos of those colors side by side, since the three sit close together. Ideas for the rest of the room live in the [playroom corner Concept Sketch](https://cushionguide.com/concepts/playroom-corner-cushions/). How wide is the wall you're picturing? ## A 39-inch question with a happy answer A buyer in the US measured a playroom and asked whether the kids corner sofa cushion could be made with 39-inch straight sides to fit. It already is: 39 in (100 cm) along each straight edge, right off the listing. Sometimes the size you need is sitting there waiting, and all it takes is knowing which edges the number belongs to. > **Tailor's margin:** Measure a quarter circle floor cushion along the two walls from the corner; a size like 39 in (100 cm) is the radius, never the curve. > Two quarter-circle corner cushions pushed together make a half circle against a flat wall, and the reading spot doubles in size. > > — Rosa ## Buyer questions **A common question:** Is the corner floor pillow shaped like a quarter circle? **The workshop's answer:** Yes. The corner floor cushion is a quarter-circle shape, and it comes in several sizes. **A common question:** On the corner wedge cushion, what exactly do the listed measurements refer to? **The workshop's answer:** The two straight edges. The shop can also send photos so you can compare colors such as lavender, indigo and blue side by side. **A common question:** Could the kids corner sofa cushion be made with 39-inch straight sides to fit my room? **The workshop's answer:** It's already made at 39 in (100 cm) along the straight sides. **A common question:** If I put two corner cushions together, will they make a half circle? **The workshop's answer:** Yes, geometrically: two quarter-circle corner cushions pushed straight edge to straight edge form a half circle against a flat wall. The part to check is your room, so send a photo of the wall and floor and the workshop confirms the fit. **A common question:** Can I get the corner floor cushion without the buttons, or with a ruffle? **The workshop's answer:** It can be made without tufting buttons. Ruffles aren't offered, but a double layer in two contrasting fabrics and colors is. ## Questions buyers ask next ### What size corner floor cushion suits two toddlers? Corner floor cushions come in sizes such as 40 x 40 in (102 x 102 cm) and 48 x 48 in (122 x 122 cm), priced by side length. The 40 x 40 in size suits two toddlers sharing the corner. ### How thick is a tufted corner floor cushion? The standard tufted thickness is 4 in (10 cm). Thicker versions at 5-6 in (13-15 cm), or even 10-12 in (25-30 cm), are made to order when the corner needs more loft. ### What if my seat is curved rather than a square corner? Measure the inner and outer curves with a flexible tape or string, the straight end-to-end distance, and the depth at both ends and the middle, then add a photo. Long curves are made as matching segments. ## Related at the atelier - [How big can a round or corner floor cushion be?](https://cushionguide.com/answers/largest-round-corner-floor-cushion-size/): The largest tufted floor cushion is 48 x 48 in (122 x 122 cm), and the corner floor cushion also stops at 48 in, so a 56 x 56 in corner or a 75 in (190 cm) round floor cushion isn't made. - [Corner Floor Cushion in Blue and Yellow Stripes for Kids](https://cushionguide.com/readings/sky-blue-yellow-stripe-corner-floor-seat-kids-room/): A corner floor cushion is the most generous seat in a kids' room: it takes a pile of children at floor level, where a small sofa takes three. - [Corner floor cushion in red gingham, through the seasons](https://cushionguide.com/readings/red-gingham-corner-floor-seat-blue-gray-walls/): A red gingham corner floor cushion stays cheerful all year against blue-gray walls, because the cool paint calms the red and the red warms the paint. - [Corner Floor Cushion in Chocolate Brown: Styling a Reading Nook](https://cushionguide.com/readings/brown-gray-corner-floor-seat-oak-bookcase-nook/): A corner floor cushion holds up to family use when the seat is a dark, forgiving color and the backrest pillows are pale, so the corner still looks light. - [How do you measure for a corner floor cushion?](https://cushionguide.com/answers/corner-floor-cushion-measurements-wall-sides/): A corner floor cushion is measured by its two straight sides, the ones that sit against the walls and meet at the 90-degree corner. - [Corner floor cushion sizes: reading the quarter circle](https://cushionguide.com/guides/corner-floor-cushion-quarter-circle-size/): A corner floor cushion is sized by its two straight sides, the ones that sit against the walls, so 48 x 48 in means 48 in along each wall from the back corner. - [Floor seating for real evenings: cushions, corner seats and low sofas](https://cushionguide.com/guides/floor-seating-ideas/) *Porch light's on — Rosa* --- Written by Rosa Delgado (https://cushionguide.com/masters/rosa/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/answers/corner-floor-cushion-quarter-circle-size/