Granny Square Blanket Calculator

Crochet

Choose a blanket size and enter your blocked square size. Add a border and the weight of one square for the yarn too.

Quick answer. A 48 x 60 in throw made from 6 in granny squares takes 80 squares, laid out 8 across and 10 down.

Source: blanket width and length divided by square size; throw size from A Crocheted Simplicity.

Your granny square blanket

1. Blanket

in
in
in

2. Your square

in
g

Make, block and measure one square. Weigh it on a kitchen scale to get the yarn total too.

3. Yarn (optional)

g
%

Result

0

Your layout

Lay the squares out on the floor before joining so you can balance the colours.

Granny squares needed by blanket size

Number of squares by blanket size and square size
Blanket4 in5 in6 in8 in10 in12 in
Baby blanket, 36 x 36 in81493625169
Crib, 36 x 45 in996348302012
Lapghan, 36 x 48 in1087048302012
Throw, 48 x 60 in18012080483020
Afghan, 50 x 65 in20813088483520
Twin bed, 66 x 90 in391234165886348
Full / double bed, 80 x 90 in4602881951107256
Queen bed, 90 x 100 in5753602551439064
King bed, 108 x 100 in67544030618211072

Rounded to the nearest whole square each way, so the finished size can be a little over or under. Blanket sizes from A Crocheted Simplicity.

How the layout is worked out

  • Squares across = (width minus both borders) / square size, rounded to the nearest whole square
  • Squares down = (length minus both borders) / square size, rounded
  • Total = across x down
  • Yarn = squares x weight of one square, plus 15% for joining and border

Sources

Common questions

How many granny squares do I need for a throw blanket?
With 6 in squares, a 48 x 60 in throw is 8 x 10 = 80 squares.
How many granny squares for a queen size blanket?
A 90 x 100 in queen in 6 in squares is 15 x 17 = 255 squares, finishing at 90 x 102 in.
How many 4 inch squares for a baby blanket?
A 36 in square baby blanket takes 9 x 9 = 81 four inch squares.
How do I work out yarn for a granny square blanket?
Make one square, weigh it, and multiply by the number of squares. Add about 15% for joining and the border.
Should I measure my square before or after blocking?
After. Blocking can change the size, and the blanket will be the blocked size.