How to Measure a Sofa or Sectional for a Cover: A Complete Guide

Whether your sofa anchors a living room you use every day or sits in a second home that stays empty for months at a time, a well-chosen cover is one of the most effective ways to protect it.

The problem is straightforward. The wrong cover can leave you with gaps where dust and sunlight can get in and damage the fabric, and it only takes a small amount of damage to leave you with a big repair or, worse, a ruined sofa. Getting the right fit comes down to one thing: knowing how to measure a sofa before you order a cover.

This guide walks you through measuring every major furniture type you're likely to encounter, from a standard sofa to a sectional, a loveseat, and a chaise, with guidance on oversized and unusual pieces too.

It covers what dimensions matter, what to record, and how to use those numbers to choose the right cover size. If the measuring feels daunting, there's a free service that takes it off your hands entirely.

Why Getting the Right Sofa Cover Size Matters

A furniture cover only protects your sofa when it fits well. That's worth understanding before you take a single measurement.

Furniture covers protect upholstery from two persistent threats: dust and sunlight. Dust doesn't just sit on the surface of fabric. Over time it works its way into the weave, where it acts as a mild abrasive.

On upholstered furniture, this compounds with temperature and humidity fluctuations. The fabric expands and contracts slightly, and embedded dust particles move with it, gradually weakening the fibers from within.

According to research from the Florida Solar Energy Center at the University of Central Florida, UV radiation is responsible for approximately 40% of interior fading damage, and this occurs even on overcast days, even through standard windows.

A sofa that looked rich and vibrant when you bought it can look washed out and tired without any obvious cause.

A cover that doesn't fully drape over your sofa leaves the most vulnerable areas exposed, including the arms, the lower front panels, and the back cushions, which are precisely where fading tends to show first because they receive the most direct exposure.

A cover that's too tight creates a different problem. It pulls taut, which can distort how it sits over thick cushions and prevents the loose, natural drape that allows full coverage of curved surfaces.

The Butler's Closet Furniture Sun & Dust Covers for Sofas and Large Sectional Seating are deliberately cut to be loose and generous. The Medium Sofa Cover measures 83" x 145" and the Large Sofa Cover measures 83" x 160". Knowing your sofa's dimensions tells you which size gives you the right coverage.

Tools You Need to Measure a Sofa Correctly

Measuring a sofa for a cover requires just a flexible measuring tape, a pen, and a piece of paper.

A cloth or plastic measuring tape works better than a metal one. Metal tapes don't flex around curved sofa arms and cushion profiles as cleanly. If a metal tape is all you have, that's fine. Measure in straight lines from edge to edge rather than following the curve.

Write down your numbers as you go. Don't rely on memory between measuring and ordering. If you’re using the measuring service, take photos and submit them so that the Butler’s Closet experts can recommend the best cover. The dimensions you’ll need for each piece will vary depending on the type of item:

• Width: Measure from the outer edge of one arm to the outer edge of the other arm at the widest point. Include the full width of the arms, not just the seat.
• Depth: Measure from the very back of the sofa frame to the front edge of the seat cushions. If attached back cushions extend further than the frame, measure from the outermost rear point.
• Height: Measure from the floor to the top of the backrest at its tallest point.
• Back Diagonal: Measure the diagonal distance from the tallest point of the backrest to the outermost front point of the seat cushion.
• Seat Height: Measure from the highest point of the seat cushion to the floor.

When you compare your numbers to the cover dimensions, focus first on width, since sofa covers are cut to drape down the sides and front. Height confirms the cover reaches well down the back panel.

Depth tells you whether it reaches the front edge with room to spare, and the back diagonal and seat height ensure that it can cover the shape of your specific piece.

How to Measure a Standard Sofa for a Cover

Before you start, make sure you have your tape measure, a pen, and somewhere to record your numbers. Work through each measurement in order so nothing gets missed.

1. Measure width: Stand in front of the sofa and run the tape from the outside edge of the left arm to the outside edge of the right arm. Don't measure seat cushion width. You want the full outer dimension at the widest point. Write that number down.
   
2. Measure depth: Stand beside the sofa and run the tape from the back of the frame to the front edge of the seat cushion. If attached cushions jut out past the frame, measure from the outermost rear point instead.
   
3. Measure height: Run the tape from the floor to the very top of the backrest.
   
4. Measure the back diagonal: Hold the tape at the topmost point of the backrest and run it, taut, to the end of your seat cushion.
   
5. Measure seat height: Run the tape from the floor to the highest point of your seat cushion.

Once you have those numbers, compare your width to the cover dimensions:

• Medium Sofa Sun & Dust Cover: 83" x 145". The 83" dimension drapes down the back and front of the sofa. The 145" wraps across the full sofa width and down both sides.
• Large Sofa Sun & Dust Cover: 83" x 160". The same principle applies, with the extra length accommodating wider sofas or greater drop on each side.

The cover's long dimension should comfortably exceed your sofa's width plus the drop on each side. The covers are cut to be generous by design, so they drape fully over the piece rather than simply resting on top.

If your measurements put you at the border between sizes, choose the larger cover. A slightly larger drape causes no harm, while an undersized cover defeats its purpose.

Remember that, depending on where the sofa or chair sits in the room, how you cover it may vary. A chair placed against a wall will have the back covered by its position. If the cover doesn’t reach the bottom of the sofa at the front, therefore, you can adjust it to cover less of the back. This is why the specifics of your piece are so important.

How to Measure a Sectional Sofa for a Cover

Sectionals need a different approach. A single cover won't wrap a full L-shaped or U-shaped sectional cleanly because the shape simply doesn't allow it. The approach that works best is using two covers (or occasionally three) positioned to overlap at the corner section, so the entire arrangement is protected without gaps.

Start by thinking of your sectional as two separate sofas connected at a corner. Measure each arm of the sectional individually, using the same three-dimension method: width from outer arm edge to the open corner side, depth front to back, and height floor to top of the backrest. Do this for both sections of the L-shape.

Take note of where the arms are. A sectional typically has one or two external arms, which are the end pieces that face outward, and the remaining sides are open at the corner junction. Measure to the outer edge of each actual arm.

When you send your measurements and a photo to The Butler's Closet, the team looks at how two covers can overlap at the corner to leave nothing exposed. The covers' generous dimensions mean there's usually enough fabric to meet well at the junction.

For more complex configurations, including a U-shape, an extended chaise at one end, or an unusually deep corner, the free measuring service becomes especially useful. Email your dimensions and a photo of the full sectional arrangement to info@thebutlerscloset.com, and the team will recommend which covers and positioning will give you complete coverage.

How to Measure Chaises, Loveseats, and Oversized Pieces for a Cover

Not all sofas are the same shape, and covers that fit one configuration won't necessarily work for another. Here's how to approach the most common furniture types you're likely to encounter beyond a standard sofa.

Loveseats

Measure a loveseat the same way you'd measure a standard sofa: width from outer arm to outer arm, depth front to back, height from floor to top of the backrest, back diagonal, and seat height.

Loveseats are generally narrower than full sofas. Confirm the cover's long dimension comfortably exceeds your loveseat's width plus the drop on both sides. If you're uncertain about sizing, email your measurements before ordering.

Chaises

A chaise lounge or chaise section has no back arm on the extended end. Measure the full length of the piece from the back of the backrest to the far end of the footrest.

Also measure width across the widest point and height at the back. Because a chaise is long and low, length becomes the critical dimension and you need enough cover length to drape fully over that extended footrest section.

Compare your chaise length to the cover's long dimension (145" for the Medium, 160" for the Large) before ordering.

Oversized sofas

Some modern sofas run considerably wider than standard sizes, and some have particularly deep seats or thick cushions. If you're working with a piece that's unusually large in any dimension, err toward the Large cover.

The loose, unfitted design accommodates a wide range of furniture shapes without compression. But a very oversized piece benefits from a specific recommendation rather than a size estimate, perhaps even multiple covers, so it's worth contacting the free measuring service before ordering.

Pool tables, large desks, and other substantial pieces

The Butler's Closet sofa covers are versatile enough to protect large desks, pool tables, and other substantial furniture. Measure the piece in the same way, recording width, depth, and height, then compare to the available cover dimensions. The loose, unfitted design handles varied shapes well.

When to Use The Butler's Closet Free Measuring Service

Some furniture is straightforward to measure. A standard three-seat sofa with clean lines and defined arms gives you clear, unambiguous numbers.

Other pieces are harder to size: sofas with unusual silhouettes, irregular corner sections, asymmetric arms, deeply modular configurations, or antique pieces where you want complete confidence before committing to an order.

For any furniture that doesn't fit neatly into the standard calculations above, The Butler's Closet offers a free measuring service. Here's how it works.

Take your measurements using the method described in this guide. Then photograph the piece: a clear shot from the front showing full width, and one from the side showing depth and height. Email both the dimensions and the photos to info@thebutlerscloset.com.

The team reviews your dimensions alongside the photo and recommends the specific cover or combination of covers that will give your piece complete, well-fitted protection.

For sectionals, this typically includes guidance on how to position two covers so the corner section is fully covered with the right amount of overlap. For unusually shaped or oversized pieces, they may suggest a configuration that a standard size calculation would miss.

This service is free. No purchase is required. The goal is that you order exactly what your furniture needs, with no guesswork, no returns, and no areas left exposed.

For Interior Designers and Decorators

Interior designers and decorators working with client homes, second residences, or seasonal properties often need to cover multiple pieces across different rooms.

The Butler's Closet trade program is available for professionals managing these kinds of projects. The free measuring service is available to trade customers as well, so just email info@thebutlerscloset.com for more information.

How to Measure a Sofa for a Cover: Final Thoughts

Once you've taken your measurements, width from arm to arm, depth from front to back, height from floor to top of the backrest, back diagonal and seat height, you have everything you need to choose the right sofa cover with confidence.

The right fit means the cover drapes fully over your sofa, protecting the arms, cushions, and side panels that are most exposed to dust and sunlight. For sectionals, the same approach applies section by section, with covers overlapping to leave nothing unprotected.

And if your furniture presents any complexity at all, the free measuring service is there to take the guesswork out entirely.

Measuring a sofa well isn't always obvious. That's exactly why this guide exists, and why the measuring service is free. You've invested in good furniture. Getting the cover right is the straightforward next step.

Explore The Butler's Closet Furniture Care collection to find the right cover for your sofa, sectional, or other pieces.

Frequently Asked Questions

How do I measure a sofa for a cover?

Start with your measurements: usually width, depth, height, back diagonal, and seat height. For width, run your tape from the outer edge of one arm to the outer edge of the other arm at the widest point, making sure to include the full arms rather than just the seat width.

For depth, run the tape from the outermost rear point of the sofa frame to the front edge of the seat cushions. For height, measure from the floor to the top of the backrest.

For the back diagonal, measure from the topmost point of the backrest to the frontmost part of the seat cushion. For the seat height, measure from the floor to the top of the seat cushion.

Once you have those numbers, compare your width to the cover's long dimension. The cover needs to span your sofa's full width and drape down both sides, so the cover's long dimension should comfortably exceed your sofa width plus the drop on each side.

The Butler's Closet Furniture Sun & Dust Covers for Sofas come in two sizes: Medium at 83" x 145" and Large at 83" x 160". Both are cut to be deliberately generous and loose-fitting, designed to drape fully over the piece rather than compress it.

If your measurements put you at the border between sizes, choose the larger. A little extra drape does no harm, while an undersized cover leaves edges exposed to the dust accumulation and UV damage you're trying to prevent.

The Winterthur Museum's textiles conservation team notes that damage to materials comes from many sources, including dust and environmental exposure, making full coverage essential to effective preservation.

How do I measure a sectional sofa for a cover?

For complex configurations including an extended chaise section, an angled corner, or a modular arrangement that has been reconfigured, it's worth sending your measurements and a photo to the free measuring service at info@thebutlerscloset.com.

The team can recommend the exact covers and positioning for complete, gap-free coverage. This service is free and helps you order exactly what your sectional needs.

The key is to treat a sectional as two separate sections rather than one continuous piece. Measure each arm of the sectional individually: width from the outer arm edge to the open corner side, depth front to back, and height. Repeat this for both sections of an L-shape, or all sections of a U-shape.

With each section measured, you can determine which cover size fits each arm and plan for the two covers to overlap at the corner junction to eliminate gaps.

The covers' generous dimensions make this possible. There's enough fabric on each cover to drape fully over its section and still meet at the corner with meaningful overlap.

What size cover fits a standard sofa?

Standard sofas vary considerably depending on manufacturer, style, and number of seats. A two-seat sofa might run anywhere from 60 to 80 inches wide.

A three-seat design often falls between 80 and 100 inches wide. Oversized and sectional arms can exceed that range. Because of this variation, there's no single size that fits all sofas. Measuring your specific piece is the only reliable approach.

That said, The Butler's Closet Medium Sofa cover at 83" x 145" fits a wide range of standard sofa sizes. The covers are deliberately cut to be loose and generous rather than tailored, so they accommodate a range of widths and profiles without compression.

For larger three-seat designs, wide sofas, or pieces with substantial arm height, the Large at 83" x 160" will generally provide the additional coverage to ensure the cover drapes fully down both sides, though for other pieces you may need to use multiple covers.

The most reliable approach is to measure your sofa's width first, then consider whether the cover's long dimension will reach comfortably across and down both sides.

Furniture experts consistently recommend measuring before ordering any cover, whether a dust cover or a slipcover, to avoid the frustration of a poor fit on a piece you've invested in. If you're uncertain, use the free measuring service to get a recommendation based on your actual dimensions.

How do I measure a couch for a slipcover versus a dust cover?

The measurement process differs meaningfully depending on the type of cover you're fitting. Slipcovers are tailored covers designed to conform closely to the shape of your sofa, pulling down around cushions and tucking behind them for a structured look.

Measuring for a slipcover typically requires detailed dimensions of individual cushions, arm widths, the back panel height, seat depth, and the tuck-in depth behind the seat cushions, which can involve many separate measurements for a precise fit.

Dust covers work differently. They're designed to drape loosely over the piece rather than conform to it. For a loose furniture dust cover, you need overall sofa width from outer arm to outer arm, depth front to back, and height from floor to top of the backrest. The cover falls over the entire piece and hangs down on all sides.

This loose, unfitted design is intentional for furniture protection purposes. It accommodates different furniture profiles, cushion heights, and arm shapes without requiring precise cushion-by-cushion measurements.

It also allows the cover fabric to breathe around the upholstery beneath, which matters during extended storage or periods of non-use. Textile conservation professionals generally recommend breathable coverings over sealed solutions for long-term upholstery care, which is the same principle that guides The Butler's Closet's use of 100% cotton percale, unbleached and undyed, for all their furniture covers.

How do I measure a loveseat for a cover?

Measure a loveseat the same way you'd measure a standard sofa: width from outer arm edge to outer arm edge, depth from the back of the frame to the front edge of the seat cushion, height from the floor to the top of the backrest, back diagonal from the top of the backrest to the front of the sofa cushion, and seat height from the floor to the top of the seat cushion.

Loveseats are generally narrower than full sofas. The key measurement is width. Confirm the cover's long dimension comfortably exceeds your loveseat's width plus the drop on both sides.

The Butler's Closet Medium cover at 83" x 145" provides generous coverage for most loveseat sizes, given that the loose, unfitted design drapes naturally over the piece rather than conforming precisely to its profile.

As with any upholstered furniture, take your actual measurements before ordering rather than assuming a size based on general categories. Manufacturers use the same terms to describe sofas with meaningfully different dimensions, and a loveseat from one maker can differ significantly from another's.

A few minutes with a tape measure removes all the guesswork. If your loveseat has an unusual arm profile, a particularly deep seat, or features that make you uncertain about sizing, email your measurements and a photo to info@thebutlerscloset.com for a free recommendation before you order.

The North Carolina Museum of History recommends covering upholstered pieces to protect against both dust and light when items aren't in regular use.

How do I measure a chaise lounge for a cover?

A chaise lounge has a longer profile than a standard sofa, with a footrest section extending beyond the seat. The critical measurement for a chaise is full length.

Run your tape from the back of the backrest to the far end of the footrest. But the length is not necessarily the maximum length you need. The chair part of the chaise lounge is higher than the lounge part, so you should also account for an uneven drape over the sides.

Also measure width across the widest point (usually the seat or back section) and height from the floor to the top of the backrest.

Because a chaise sits low and extends long, the cover needs more length relative to height than a typical sofa requires. Compare your chaise length to the cover's long dimension (145" for the Medium, 160" for the Large) and confirm the cover will drape fully over the footrest end.

Chaises that form part of a sectional require additional thought. The chaise section is one arm of a larger arrangement, and you'll want to measure it as part of the full sectional rather than in isolation.

If you're covering a sectional with an attached chaise, use the free measuring service to ensure the cover configuration accounts for that extended section correctly. Email your measurements and a photo to info@thebutlerscloset.com or for a specific recommendation before ordering.

What should I do if my sofa has an unusual shape or profile?

Unusual sofas, whether they feature asymmetric designs, curved silhouettes, very deep seats, floating frames, or modular configurations that have been rearranged, don't always respond well to standard size calculations.

The same dimensions still apply (width, depth, height, back diagonal, and seat height), but what those numbers mean for cover sizing can be less predictable.

In these situations, take your measurements, photograph the piece from two angles (front and side), and send both to info@thebutlerscloset.com. The team can review the actual profile and recommend the cover and positioning that works for your specific piece.

For deeply curved sofas, measure at the widest and deepest points, since curves mean the cover needs more fabric than a boxy piece of nominally similar dimensions.

For floating-frame sofas raised on visible legs, measure height from the floor to the top of the backrest as usual. Note that the cover won't reach the floor on a piece raised on tall legs. It will stop at approximately seat level, which is fine for protection purposes.

The cover still shields all the upholstered surfaces. What matters is full coverage of the fabric faces of the sofa, not whether the cover pools on the floor.

Does a sofa cover need to touch the floor?

Not necessarily, but in general you will avoid having dust blow up from the floor the cover goes down as far as possible. The purpose of a furniture dust cover is to protect the upholstered surfaces, including the seat cushions, back cushions, armrests, and the fabric panels on the sides and back of the sofa.

These are the areas exposed to dust accumulation and UV damage. The cover needs to drape over all of these surfaces as an absolute minimum, and will do its job most effectively if it goes down to the floor as well.

The Butler's Closet sofa covers are cut generously so they drape well down the sides and front of the piece. On a lower profile sofa or even on a sofa with substantial arm height and thick cushions, the cover can reach the floor on the sides if you measure correctly and choose the right size or combination of covers. The key is to protect the upholstered surfaces that matter from every angle.

If the cover is stopping short of the floor and especially if it doesn’t fully cover the upholstered edges, go for the larger size. If it's fully draped over, the fit is working.

Full coverage of the fabric faces is the bear minimum you should expect, but floor contact can be the measure of a truly good-fitting cover.

The Florida Solar Energy Center confirms that UV exposure causes significant interior fabric damage, making consistent, full coverage of upholstered surfaces an absolute necessity.

How does the free measuring service work?

The free measuring service is straightforward: you send your furniture dimensions in line with the illustrations in this guide, with a photo, and the team recommends the right cover or combination of covers before you order anything.

To use it, take all the key measurements for your sofa or sectional: width from outer arm to outer arm, depth front to back, height from floor to top of backrest, back diagonal from the top of the backrest to the front of the seat cushion, and seat height from the floor to the top fo the seat cushion. Write them down.

Take a clear photograph of the piece, one from the front showing full width and one from the side showing depth and height. Then email both the measurements and the photos to info@thebutlerscloset.com. 

The team reviews your dimensions alongside your photo and comes back with a specific recommendation: which size cover, and for sectionals, how many covers and how to position them so no surface is left exposed.

This service is free. No purchase is required to use it. It's especially valuable for sectionals needing multiple covers, unusually large or shaped pieces, and antique or valuable furniture where you want full confidence before ordering.

Whether you have a single piece you’re keen to protext or you’re a designer or decorator with full collections to protect, we can help. The goal is a recommendation you can act on directly, giving you the right covers for your specific furniture without any second-guessing.

Can I use a sofa cover to protect furniture during storage?

Protecting furniture during storage or extended periods of non-use is one of the most important applications for a quality dust cover. When a sofa goes into storage, whether in a second home closed for a season, a room being renovated, or a storage facility, it faces prolonged exposure to dust without the benefit of regular cleaning.

Dust accumulation during storage is more significant than most people expect. Without regular use and maintenance, dust builds up steadily on all exposed fabric surfaces.

Textile conservation specialists at the Winterthur Museum document that dust particles work their way into fiber structures over time, where they can cause chemical changes and act as an abrasive from within, which is difficult to address fully even with professional cleaning later. A dust cover eliminates this accumulation entirely for the surfaces it covers.

Light protection matters too, even in spaces that seem dark. Ambient light through windows, and the lights you switch on when entering the space periodically, adds to cumulative UV exposure over a storage season.

The Butler's Closet furniture covers are made from 100% cotton percale, unbleached and undyed, and meet textile conservation standards. 

How should I care for my sofa cover?

The Butler's Closet sofa covers are machine washable, which makes maintenance straightforward. Follow the care instructions that come with your cover.

When washing, use a gentle cycle. Because the covers are made from 100% cotton percale, unbleached and undyed, they don't contain dyes that could bleed. Avoiding high-heat washing and drying helps preserve the fabric's integrity and prevents unnecessary shrinkage over time.

Before placing a freshly washed cover back over your furniture, make sure it's completely dry. A damp cotton cover placed over upholstered furniture traps moisture against the fabric, creating conditions where mildew could develop on either the cover or the upholstery beneath.

Cotton percale covers can be machine dried on a low or medium setting, or line dried. If the cover shows any creasing from the wash, it will settle out naturally once you place it loosely over the furniture. The loose, draping design means minor wrinkles don't affect coverage or fit.

For storage between uses, fold the cover loosely and keep it in a dry location. Avoid storing it tightly compressed in a plastic bag for extended periods. The same breathability principles that make cotton percale an effective furniture cover material apply to how you store the cover itself.