A sofa cover only does its job when it fits. Too small and it strains at the seams; too large and it pools at the base and slips through the day. The good news: getting the fit right takes one soft tape measure and about two minutes. This is the calm, no-guesswork way to do it.
Most people hesitate over a cover because of one quiet worry — will it actually fit my sofa? Once you have four measurements written down, that worry disappears. You stop guessing and start choosing.
What you'll need
Nothing unusual. A soft tape measure — the kind used for fabric, not a rigid builder's tape — a notepad or your phone, and a couple of minutes with the sofa as it normally sits. Leave the cushions in place. You're measuring the sofa you live with, not a stripped-down frame.
The four measurements that matter
Every sofa cover is chosen on four numbers. To measure a sofa for a cover, take these four, in this order:
- Width — straight across the back, outer arm edge to outer arm edge.
- Depth — front edge of the seat cushion to the back of the sofa, including the cushion roll.
- Height — floor to the highest point of the backrest.
- Arm shape and height — whether the arms are rolled, square or low, and how tall they sit.
- Measuring the cushion instead of the frame. Cushions compress; the frame doesn't. Measure the sofa's structure, with cushions in their normal resting position.
- Forgetting the seat-cushion roll. The cover has to travel over the front curve of the cushions — include it in the depth.
- Measuring the seat width, not the full width. The cover wraps the arms too. Always go outer edge to outer edge.
- Pulling the tape tight. Keep it level and relaxed. A tight tape under-reads.
- Reusing one piece's numbers for another. A matching armchair or a chaise section has its own measurements. Measure each piece.
Get these four down and any cover's size guide becomes easy to read. The rest of this guide works through each one in order — each measurement builds a clearer picture of your sofa.
Step 1 — Width across the back
Measure straight across the back of the sofa, from the outer edge of one arm to the outer edge of the other. Keep the tape level and follow the widest point, including the arms themselves — not just the seat between them.
This is the single most important number. A cover is sold first on the span it has to wrap, and the width across the back is that span. Write it down before you do anything else.
Step 2 — Depth front to back
Measure from the front edge of the seat cushion to the back of the sofa, following the natural line the cover will sit along. Include the roll of the seat cushion where it curves down at the front — the cover has to travel over it.
Depth is where people most often go wrong. They measure the bare frame and forget that the cushions add several centimeters. Measure the sofa as it looks when you sit down to watch something — that's the shape the cover needs to follow.
Step 3 — Height floor to top
Measure from the floor to the highest point of the backrest. Keep the tape vertical and take the reading at the tallest part — usually the center of the back, sometimes the top of the arms on a low-backed design.
Height tells you whether a cover will reach the floor cleanly or stop short. A tailored stretch cover is designed to tuck and settle, so a small variance is fine — but a sofa with an unusually tall back is worth noting.
Step 4 — Arm shape and height
This is the measurement most size guides skip, and it's the one that changes how a cover sits. Note two things: the shape of the arm and its height from the seat.
Arms come in three broad shapes. Rolled arms curve outward and need a cover with enough give to travel over the curve. Square arms are boxy and upright — easy to cover cleanly. Low arms sit close to the seat height and give a cover less to grip. A sofa with very wide or very rounded arms is the one most likely to surprise you, so write the arm width down too.
A tailored stretch cover handles all three shapes well, because the fabric tensions itself around the form rather than relying on a fixed cut. But knowing your arm shape still helps you set expectations before the cover arrives.
Reading the size on a cover
Sofa covers are usually sold two ways: by seater count — one-seater, two-seater, three-seater — and by a measurement range in centimeters. The seater count is a quick guide; the centimeter range is the precise one. Always check your width against the range, not just the seater label, because a "three-seater" varies a lot between sofa designs.
If your width falls between two sizes, size up. Stretch fabric takes up slack far more gracefully than it stretches beyond its limit — a slightly larger cover settles in; a slightly smaller one strains. For the full breakdown of ranges and how they map to sofa types, our size guide lays it out clearly.
One thing you do not need to do: add extra centimeters for drape. A loose-fit cover is cut larger than the frame so it can fall in folds, which means measuring in an allowance. A tailored stretch cover is the opposite — it is designed to sit close, so you measure the sofa as it is and let the fabric tension itself to the frame. No drape margin to calculate.
When you're ready to match your numbers to a cover, our stretch sofa covers are listed with their measurement ranges so you can choose with the tape readings in front of you. If you want to see how the fit looks in a room, an Ivory Cream stretch sofa cover is a calm place to start.
Measuring a corner or sofa bed
Corner and sectional sofas follow the same four-measurement logic, but you measure each section as its own piece — the long run, the short run, and the corner unit — then count how the cover is sold. It's straightforward once you know how the pieces are grouped, and we walk through it fully in our guide to corner and sectional sofas.
A sofa bed is measured in its everyday seated position, not unfolded. The cover dresses the sofa as it sits in the room; the folding mechanism underneath is unaffected.
Common measuring mistakes
A few small habits cause most of the fit problems:
None of these are hard to avoid — they just need a calm minute rather than a rushed one.
A measured sofa is an easy choice
Once your four numbers are written down, choosing a cover stops being a gamble. You match your width to a range, size up if you're between options, and let a tailored stretch cover do the rest. This is the simple groundwork behind every good refresh — and it's also the spirit of Covaba's "refresh, don't replace" philosophy: keep the sofa you love, and dress it in something that fits it properly.
For the wider picture — types of cover, fabrics, styling and care — our complete guide to sofa covers brings it all together.
Frequently asked questions
What if my sofa size falls between two covers?
Size up. Stretch fabric takes up slack neatly, settling into the smaller frame, whereas a cover that's slightly too small will strain at the seams.
Do I measure the frame or the cushions?
Measure the frame, with the cushions sitting in their normal position. Cushions compress and shift; the frame is the stable shape the cover has to fit.
How accurate do I need to be?
Within a couple of centimeters is fine. Stretch covers are forgiving by design — they're built to tension around a range, not a single exact dimension.
My sofa has very wide arms — does that matter?
Yes. Arm width and shape affect the fit more than almost anything else. Note them down, and choose a cover with enough give to travel over a wide or rounded arm.
Can I reuse measurements for a matching armchair?
No. Measure each piece separately, even within a matching set. An armchair, a chaise section and a sofa each have their own dimensions.