What Size Throw Blanket Do You Need?

Most throws sold as sofa throws are too small to use as one. Here is the size that works.

Last reviewed July 26, 2026

The short answer

A throw blanket you intend to actually use should be at least 50 by 70 inches, which covers one adult lying on a sofa. Anything under 50 by 60 inches is a decorative drape rather than a blanket. For a three-seat sofa, one throw at 50 by 70 inches draped over an arm reads better than two small ones. Across the foot of a double or queen bed, look for 60 by 80 inches so it hangs evenly on both sides. For cushions, 45 by 45 cm is the standard square and an odd number on a sofa looks more natural than an even one.

The sizes, and what each is for

Throw blankets are sold across a wide range of sizes with no standard, so the label tells you very little. What matters is whether it covers a person.

40 × 50 in — decorative only, or a child's lap blanket
50 × 60 in — one adult sitting, not lying down
50 × 70 in — the useful size: one adult lying on a sofa
60 × 80 in — across the foot of a double or queen bed
90 × 90 in — a genuine blanket for two, not a throw

Matching a throw to a sofa

The instinct is to buy a throw the width of the sofa. It is the wrong instinct: a throw stretched across a whole sofa looks like a dust sheet, and it slides off the moment anyone sits down.

What works is one throw draped over one arm, or folded in thirds along the back. That leaves the sofa's own upholstery visible, which is what stops the arrangement looking like a cover-up, and it puts the blanket where a person reaches for it.

On a large corner or L-shaped sofa, two throws in the same family of colours — one on each end — read better than one enormous one.

Matching a throw to a bed

Across the foot of a bed, the throw needs to be wider than the mattress so it hangs evenly on both sides rather than stopping short. On a double or queen that means roughly 60 inches of width as a minimum.

Fold it in half lengthwise and lay it across the bottom third of the bed. It should overhang by 8 to 12 inches on each side. Less than that looks accidental; much more starts competing with the duvet.

Cushions: number, size and the odd-number rule

45 × 45 cm is the standard square cushion and the size most covers are cut for, which is why buying that size keeps your options open later.

On a two-seat sofa, three cushions. On a three-seat, three or five. Odd numbers look arranged and even numbers look symmetrical, and symmetry on a sofa tends to read as a showroom rather than a room.

Buy covers rather than whole cushions once you own the inserts. Inserts last for years, and a cover is a fraction of the price and a fraction of the storage when you change your mind.

Texture matters more than colour

A room where every soft surface has the same texture reads flat regardless of how well the colours are chosen. The reliable move is to vary the weave rather than the palette: a flat-woven linen cushion against a chunky knit throw against a smooth cotton sheet gives depth without any colour risk.

If you are unsure about colour, pick a throw that sits within two shades of something already in the room — the floor, the curtains, a wooden surface — and let the texture do the work.

Common questions

What size throw blanket is best for a couch?

50 by 70 inches. That covers one adult lying down, which is the test of whether a throw is a blanket or a decoration. Smaller throws look fine folded over an arm but will not do the job anyone actually wants them for.

How do you keep a throw from sliding off the sofa?

Drape it over an arm rather than across the seat, or fold it in thirds along the back cushions. A throw laid flat across a seat has nothing to grip and slides the moment anyone moves. Textured knits also grip upholstery better than smooth fleece.

What size cushion covers should I buy?

45 by 45 cm is the standard square and the size most covers are made in, so it keeps your options open. Buy covers and keep your inserts — inserts last for years, and swapping covers costs a fraction of replacing whole cushions.

How many cushions should a sofa have?

Three on a two-seat sofa, three or five on a three-seat. Odd numbers look arranged rather than staged. Beyond five on a normal sofa, people start moving them onto the floor to sit down, which defeats the purpose.

Should a throw match the cushions?

It should relate to them, not match them. Picking the same colour in a different texture — a knit throw against a linen cushion — gives depth. An exact match across every soft surface flattens a room out.

What is the best material for a throw blanket?

Fleece is warmest for its weight and easiest to wash. Cotton knit breathes better and suits spring and autumn. Wool is warmest overall and the most expensive to care for. For a throw that gets daily use and regular washing, fleece or cotton is the practical answer.