Granny Square Blanket Calculator & Blanket Size Chart

How many granny squares you need for a baby blanket, throw, twin, queen or king, for any square size, with a printable blanket size chart and the yarn it takes.

New to this? Read the guide, with an example

Blanket size

Width ()

Length ()

One square measures ()

Measure a finished, blocked square, with its border.

Yarn weight

you’ll need

About yd of yarn

Free granny square blanket patterns

Granny square blanket size chart

How many squares each standard blanket needs (across × down = total), for squares from 4 to 12 inches.

Number of granny squares for each blanket size and square size
Blanket	Size (in)	4″ squares	5″ squares	6″ squares	8″ squares	10″ squares	12″ squares
Lovey	12 × 12	3 × 3 = 9	2 × 2 = 4	2 × 2 = 4	2 × 2 = 4	1 × 1 = 1	1 × 1 = 1
Baby	30 × 36	8 × 9 = 72	6 × 7 = 42	5 × 6 = 30	4 × 5 = 20	3 × 4 = 12	3 × 3 = 9
Toddler / crib	42 × 52	11 × 13 = 143	8 × 10 = 80	7 × 9 = 63	5 × 7 = 35	4 × 5 = 20	4 × 4 = 16
Throw	50 × 60	13 × 15 = 195	10 × 12 = 120	8 × 10 = 80	6 × 8 = 48	5 × 6 = 30	4 × 5 = 20
Twin	66 × 90	17 × 23 = 391	13 × 18 = 234	11 × 15 = 165	8 × 11 = 88	7 × 9 = 63	6 × 8 = 48
Full / double	80 × 90	20 × 23 = 460	16 × 18 = 288	13 × 15 = 195	10 × 11 = 110	8 × 9 = 72	7 × 8 = 56
Queen	90 × 100	23 × 25 = 575	18 × 20 = 360	15 × 17 = 255	11 × 13 = 143	9 × 10 = 90	8 × 8 = 64
King	108 × 100	27 × 25 = 675	22 × 20 = 440	18 × 17 = 306	14 × 13 = 182	11 × 10 = 110	9 × 8 = 72

Crochet blanket sizes

A lovey is about 12 in square; a baby blanket 30 × 36 in; a crib or toddler blanket 42 × 52 in; a throw for the sofa 50 × 60 in. Bed blankets cover the top of the mattress and hang down the sides: twin 66 × 90 in, full 80 × 90 in, queen 90 × 100 in and king 108 × 100 in.

How the calculator counts

It divides the blanket’s width and length by the size of one square and rounds to the nearest whole square, then tells you the size that really comes out. A border adds a few inches all round, so a blanket a little small before the border is fine.

Joining granny squares

Measure a square after blocking. Joining with slip stitch or a flat join adds almost nothing; a decorative join-as-you-go or a single-crochet ridge adds about ¼ in per seam, which over a big blanket can be a few inches.

Prefer working in one piece? Try the C2C blanket calculator.