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Granny Square Count Calculator – Online for Blanket Size

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Granny Square Count Calculator

Calculate exactly how many granny squares you need for your perfect blanket — and see a visual preview!

Your Blanket Plan
Throw Baby Crib Twin Queen King
in
in
in
Finished & blocked size of one square
in
Extra space between squares from the join method (usually 0 for tight joins)

Enter your blanket dimensions and granny square size,
then click Calculate to see results.

What Can You Make?
in
in

Enter how many squares you have and their size
to see what blanket sizes you can make.

Standard Blanket Size Reference
Blanket Type Width (inches) Height (inches) Width (cm) Height (cm)
Lovey / Security Blanket12123030
Baby Blanket30367691
Stroller Blanket30367691
Receiving Blanket4040102102
Crib Blanket4560114152
Throw Blanket5060127152
Lap Blanket364891122
Twin Bed6690168229
Full / Double Bed8090203229
Queen Bed9090229229
King Bed10890274229
California King10896274244
Frequently Asked Questions
How many granny squares do I need for a throw blanket?
For a standard throw blanket (50" × 60"), using 4-inch granny squares with no gaps, you'll need approximately 13 squares across × 15 squares down = 195 squares total. With 5-inch squares, you'd need about 10 × 12 = 120 squares. Use our calculator above to get the exact count based on your specific square size and desired blanket dimensions.
What is the best size for a granny square in a blanket?
The most popular granny square sizes for blankets range from 4 to 6 inches (10–15 cm). Smaller squares (3–4") create a more intricate, detailed look but require more squares and joining work. Larger squares (6–8") work up faster and are great for bold, modern designs. For beginners, 5-inch squares offer a great balance — easy to handle and efficient to join.
How does seam allowance affect my granny square count?
Most joining methods (like slip stitch join or invisible join) add little to no extra width between squares, so the gap is effectively zero. However, methods like single crochet join or decorative joins can add 0.25"–0.5" per seam. If you're using a join that adds width, enter that amount in the "Gap / Join Allowance" field so your final blanket dimensions are accurate. Our calculator factors in (number of squares - 1) × gap for each direction.
Should I block my granny squares before measuring?
Yes, absolutely! Blocking your granny squares before measuring and joining is highly recommended. Blocking ensures all squares are the same size, which makes joining easier and your finished blanket look professional. Always measure your squares after blocking to get the true, final size for accurate calculations. Unblocked squares can vary in size by up to 0.5 inches, which compounds across a large blanket.
How many extra squares should I make for a blanket?
We recommend making 5–10% extra squares beyond your calculated total, with a minimum of 2–3 spare squares. These spares are invaluable if a square gets damaged, stained, or if your tension varies slightly causing some squares to be a different size. Extra squares can also be used to make a matching pillow cover or to extend the blanket later. Our calculator automatically suggests a spare count for you!
How many granny squares for a king size blanket?
For a king size blanket (108" × 90"), using 4-inch squares you'll need approximately 27 across × 23 down = 621 squares. With 5-inch squares, about 22 × 18 = 396 squares. With 6-inch squares, about 18 × 15 = 270 squares. A king blanket is a major project — expect to spend several months on it! Use our calculator for precise numbers based on your square size.
Can I mix different sized granny squares in one blanket?
Yes, but it requires more planning. One popular approach is to use a large central square surrounded by smaller squares of a proportional size (e.g., one 12" square with twelve 4" squares around it to form a 12" × 12" block). Another method is to make all squares the same size but in different patterns. If mixing sizes, sketch your layout first and use our calculator for each size group separately, then combine the counts.
What's the best way to join granny squares?
Popular joining methods include: Slip Stitch Join (flat, nearly invisible, adds negligible width), Single Crochet Join (creates a raised ridge, adds ~0.25" per seam), Whip Stitch (sewn, very flat, minimal gap), Invisible/Mattress Stitch (sewn, completely flat, no added width), and Flat Braid Join (decorative, adds 0.5"–1" between squares). Choose based on whether you want the join to be visible or hidden, and adjust the gap allowance accordingly.
How much yarn do I need for a granny square blanket?
As a rough estimate, a 4-inch granny square in worsted weight yarn uses about 15–25 yards of yarn per square. For a throw blanket needing ~200 squares, you'd need approximately 3,000–5,000 total yards across all colors. Always buy an extra skein of each color for safety. Yarn usage varies by stitch pattern, hook size, and tension, so make one test square and measure your actual yardage for the most accurate estimate.
How do I adjust if some of my granny squares are slightly different sizes?
Small size variations (under 0.25") can often be fixed by blocking all squares to the same dimensions. For larger discrepancies, you can add a border round to smaller squares to bring them up to size, or use a forgiving join method that accommodates slight differences (like single crochet join). For best results, always check your gauge, use consistent yarn weight and hook size, and block before joining. Measuring a sample of 10+ squares and taking the average size gives the most reliable calculation input.
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