Crochet Afghan Size Chart

While afghan crochet blankets are a popular item to make, believe it or not, there is no exact size that an afghan blanket should be. Afghan blankets can be anything from a throw blanket to sit with on the couch, to a blanket that covers a certain size bed.

Below we’ll elaborate on blanket sizes worked in rows and how many granny squares does it take to make a blanket as well!

How Crochet Blanket Sizes Work

Please keep in mind that all blankets sizes listed here are approximate. They do not need to be followed to the exact measurement in order to work for your specific situation. For example, if you make a lap blanket to be 30″ x 40″, that would be OK and still work perfectly fine, even though those are not the exact measurements I list for that size.

Bedding sizes however can be a little different in this regard. A blanket made for a bed has to fit that particular bed’s dimensions. There is a little room for adjustments. We add a few inches to three sizes to account for the drape (the amount that hangs off the side of the bed). You can change your afghan quilt to have as much or as little drape as you want!

Really, it is up to you to decide what is best for your situation.

Crochet Couch Afghan Sizes

Afghans for couches called throw or lap blankets. “Lapghan” blankets are to be used by anyone in a sitting position. This can be someone sitting on the couch, or in a wheelchair.

Throw blankets can really be any size as they are just “thrown” onto the back of a chair, couch or other piece of furniture. Throw blankets are some of my favorite blankets to make because they are perfect to cuddle up in while watching TV (or crocheting!) on the couch.

Blanket SizeDimensions (in)Dimensions (cm)
Lapghan 32 to 48 x 35 to 40 81 to 122 x 89 to 102
Throw52 x 60132 x 152

Bedding Afghan Blankets

Some of the largest afghan blankets are for on top of beds. To determine the correct size of quilt, you first need to understand the common sizes of US mattresses. Next, you’ll have to decide if you want to include a “drape” or “drop” for your blanket. This is the part that hangs of three of the sides.

A “drape” will allow the blanket to hang down the sides of the mattress anywhere between 8-20 inches (20-50 cm). Our blanket size table below adds 8-10″ extra on three of the sides for the drape.

Take a look at all the full size blanket measurements below.

Blanket SizeDimensions (in)Dimensions (cm)
Twin 66 x 90 168 x 229
Twin XL66 x 95168 x 241
Full or Double80 x 90203 x 229
Queen90 x 100203 x 254
Full or Queen90 x 90 203 x 203
King108 x 100274 x 254
California King104 x 108264 x 274

How Many Granny Squares are in a Blanket?

Well, that depends on two things: the size of blanket you’re making and the size of granny square you will make it out of.

Granny squares can come in any size, but the most common is anywhere between 4-6 inches.

To get the number of granny squares your blanket project will need, take the total length of the blanket divided by the length of your granny square. If the result is a fraction, round up. Now do the same for the width of your project. Lastly, multiply the two results together, and you have the exact number of granny squares you need.

Here it is as a math equation:

round_up((blanket_length / grannysq_length)) x (round_up(blanket_width / grannysq_width)) = total_granny_squares

Here is the math equation for a lapghan that is 36″ x 42″, made up of 4″ x 4″ squares.

Side #1 = (42 / 4) = 10.5, rounded up to 11
Side #2 = (36 / 4) = 9

11 x 9 = 99 granny squares needed

Now, as you can see, sometimes the granny square sizes don’t nicely fit into the overall blanket’s dimensions. There are two ways to deal with this:

  1. Change the granny square size. For example, instead of using 4″ squares for to make this blanket, use 3″ squares instead, since both blanket dimensions are divisible by 3.
  2. Deal with it. A 44″ blanket isn’t that much different than an 42″ blanket… Functionally, both sizes will work exactly the same!

Too Many Squares?

Does the blanket you want to create require too many squares? You can simply increase the size of your squares. A quick way of doing that would be by adding an extra round to each square. This increases the size of each square, which will result in fewer squares needed to get to the same size.

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