How to Measure Your Sofa for a Slipcover, Including Sectionals and Recliners

Measure the sofa at its widest points, then measure the surfaces a cover actually has to wrap around: arms, seat, back, cushions, and any moving parts. For a basic stretch cover, that usually takes 10 minutes; for a sectional or recliner, give yourself 20 minutes, a helper, and a page of notes before you order anything.

This is the unglamorous step that keeps a cover from turning into a loose blanket the first time the dog launches onto the sofa. A cover can be washable, tough, and reasonably good-looking, but it still has to match the shape of the furniture underneath it. Don’t measure from arm to arm, pick the nearest size, and hope the elastic sorts it out. That’s how you buy the same cover twice.

Start with the kind of cover you’re buying

A one-piece stretch slipcover and a made-to-measure slipcover do not need the same information. A universal stretch cover generally asks for a broad width range and sometimes the maximum seat width. A tailored or separate-piece cover needs more: cushion dimensions, arm shape, back height, and the depth of the frame. That extra detail is not fussiness. Curves, wedge arms, deep seats, and L-shaped cushions all change the path the fabric must cover. Custom-cover makers commonly ask for measurements taken seam to seam and for each cushion to be measured individually when they differ. (comfort-works.com)

Before measuring, read the seller’s sizing diagram for the exact cover. Keep it open on your phone. “Sofa width” might mean the full outside width, the width between the arms, or the width of the seat cushions; those are three different numbers on most sofas.

Use a tape measure, not a guess

Use a retractable metal tape measure for the frame and a flexible cloth tailor’s tape for rounded arms, rolled backs, and cushions. A metal tape can bridge across a curve and quietly add inches you do not have. If you only own a metal tape, run a piece of painter’s tape or string along the curved surface, mark the endpoints, then measure that length flat.

Remove throws, loose bolster pillows, and the dog before you start. Put seat cushions back in their normal places, because compressed or shifted cushions change the usable dimensions. Take measurements in inches, write each one down immediately, and round only as the cover maker instructs. If its form says nearest quarter-inch, give it quarter-inches; if it asks for whole inches, don’t invent precision it cannot use.

• Overall outside width: the widest point from the outside edge of one arm to the outside edge of the other.
• Overall depth: from the farthest point of the back to the farthest front edge of the seat or frame.
• Overall height: floor to the highest point of the back, including a fixed back cushion if the cover will go over it.
• Inside seat width: the space between the arms where people—and, apparently, every pet—actually sit.
• Seat depth and seat height: from the front edge of the cushion to the back cushion, and from floor to the top of the seat cushion.
• Arm width, arm height, and arm length: measure each arm separately if they are not identical or if one side is a chaise-side arm.
• Each loose cushion: width, depth, and thickness, measured seam to seam. Label them left, center, right, chaise, or corner as you go.
• Leg height: floor to the bottom of the frame if you want a cover that stops above the floor rather than a skirted style.

Measure the sofa in sections, not as one mysterious object

For an ordinary three-seat sofa, take the overall numbers first, then work front to back: inside width, seat depth, back height above the seat, arm dimensions, and cushion dimensions. Photograph the sofa straight on, from each side, and from behind. Put the tape measure in at least one photo if you are ordering a custom cover or asking customer service to confirm the fit. It is easier for someone to spot a rolled arm or a low back from a photo than from the phrase “sort of square-ish.”

For a fixed-back sofa, measure the upholstered back as part of the frame. For a sofa with loose back cushions, measure the bare frame and every back cushion separately. Check whether the cover includes separate cushion covers or is designed to pull over everything together. These are not interchangeable systems.

How to measure an L-shaped or modular sectional

Do not measure a sectional as one huge rectangle. Break it into its actual components: left-arm sofa, right-arm sofa, armless chair, corner unit, chaise, and ottoman. Stand facing the sectional when you label left and right. That orientation matters because cover listings use left-arm-facing and right-arm-facing descriptions, and they usually mean left and right as you face the furniture.

Measure each piece as though it were being covered alone: outside width, depth, height, arm dimensions, and its cushions. Then measure the complete footprint as a check. For a chaise, record the chaise length from the back to its front edge and its width across; for a corner unit, measure both sides from the corner seam outward. Modular sectionals can look symmetrical while having a corner piece that is deeper than the other seats, so don’t copy one measurement across all pieces without checking. Sectional cover systems are often sold as distinct covers for armless, corner, chaise, and left- or right-arm units, which is why this labeling work saves so much trouble. (comfort-works.com)

If the chaise can swap sides, measure it as it sits now and buy for that configuration. A reversible sectional is a furniture feature, not proof that every fitted cover will reverse with it.

Recliners need one extra reality check

Measure a recliner twice: fully closed and fully reclined. With it closed, take the usual width, depth, height, seat, arm, and cushion measurements. With it open, measure the full front-to-back clearance and look underneath for the footrest, handle, lever, power cord, and mechanism gaps. A regular one-piece sofa cover should not be forced onto a recliner just because the closed dimensions seem close. It can bunch at the seat, block movement, or work loose every time the footrest opens.

Buy a recliner-specific cover for a recliner chair, reclining loveseat, or reclining sectional unless the manufacturer explicitly says its standard cover works with your exact moving configuration. Take a clear photo of the side with the handle or power controls and the underside around the footrest before asking for fit confirmation. Recliners can be covered, but their moving sections make them a separate measuring job rather than a standard sofa with a nicer nap feature. (comfort-works.com)

The last two minutes that prevent a bad order

Compare your notes to the product’s stated fit range, not the number in the product name. If you land at the very top of a stretch cover’s range, expect a tighter installation and less forgiveness once cushions are back in place. If you fall between sizes, don’t assume larger is safer: excess fabric has to be tucked somewhere, and that somewhere is usually the seat crease where it gets pulled loose by normal use.

Finally, measure doorways only if you are replacing the sofa or ordering a bulky custom piece, not just a cover. For the cover itself, the purchase you want to avoid repeating is the wrong-size one. Keep the measurement sheet and photos in a note on your phone; when the first cover eventually meets muddy paws, shed hair, or a laundry-day wash, you’ll have the exact numbers ready instead of beginning again.