Granny Square Planner 🧶
Instant and accurate. No sign-up required. Plan your granny square blanket: calculate how many squares you need and estimate total yarn yardage by color. Supports DK, worsted, and bulky yarn.
How to Use the Granny Square Planner
- Begin with the finished dimensions you want for the project — a baby blanket, a throw, or a full bedspread — entered in inches (with centimetre equivalents shown alongside). - Next, decide on a single square size: 4, 5, or 6 inches are the common choices, and the planner uses the size you pick to work out the grid. - Then select your yarn weight category — DK, worsted, or bulky — because yardage per square scales with how thick the yarn is, and choose how many colours you intend to rotate through the blanket. - Before trusting any plan, crochet one test square and measure it after a light blocking, because real squares rarely land exactly on their nominal size: tension, hook choice, and how many rounds you work all shift the finished width. - If your test square measures 5.5 inches rather than 6, enter that real number, not the label on the pattern. - Getting this single measurement right is what makes the rest of the estimate trustworthy, since every later count multiplies it.
- The square count comes from a simple grid. - Divide the blanket width by the square size to get squares across, divide the blanket height by the square size to get squares down, then multiply the two and round up. - Worked example: a 48 × 60 inch throw using 6-inch squares needs 48 ÷ 6 = 8 squares across and 60 ÷ 6 = 10 squares down, so 8 × 10 = 80 squares. - The yardage estimate then multiplies the square count by the per-square yardage for your yarn weight — roughly 80 yards for a 6-inch worsted square and about 35 yards for a 4-inch square. - For 80 worsted squares that is 80 × 80 = 6,400 yards total. - Spread across 4 colours, each colour supplies about a quarter of the squares, so 6,400 ÷ 4 = 1,600 yards per colour. - Remember to budget separately for the join and any border round, which can add another 8–12 percent of the field yardage depending on the joining method you choose.
- Estimates drift when the test square is skipped, so accuracy starts at the swatch: a square that finishes a half-inch wide changes both the grid and the yardage. - The Craft Yarn Council standard weight system is a reliable anchor for the DK, worsted, and bulky categories, but two yarns in the same category can still differ in yards per gram, so weigh your test square and back-calculate if you want a tighter number. - Always buy 10–20 percent more yarn than the estimate, and buy a little extra of each colour, because joins and weaving in ends consume more than the field calculation suggests and dye lots can disappear mid-project. - A frequent error is mixing yarn weights across squares, which produces uneven sizes that refuse to line up when joining. - Block each square to the same dimensions before assembly so the grid stays true. - Finally, decide your joining method early — a flat slip-stitch join eats less yarn than a raised single-crochet ridge — because that choice quietly changes the total you need to buy.
FAQ
How many granny squares do I need for a blanket?
The number of squares depends on the finished blanket size and the size of each square. For a typical throw blanket (48×60 inches) using 6-inch squares, you need 80 squares (8 wide × 10 tall). Use this planner to calculate the exact count for your dimensions.
How much yarn do I need for granny squares?
Yarn needed varies by square size and yarn weight. A 6-inch worsted weight granny square uses about 80 yards; a 4-inch square uses about 35 yards. Multiply by the total number of squares and divide by the number of colors.
What size granny square should I use for a blanket?
6-inch squares are most popular for blankets — they work up quickly and have a visible pattern. 4-inch squares create more intricate layouts but require more joining. 5-inch squares are a good middle ground.
Can I mix different yarn weights in a granny square blanket?
It is best to use the same yarn weight throughout a blanket to ensure all squares are the same size. Mixing weights will result in uneven squares that are difficult to join evenly.
How do I join granny squares together?
Common joining methods include slip stitch join (a flat, subtle seam), single crochet join (raised ridge on the right or wrong side), and flat slip stitch join. The flat join is most popular for a clean finish. Choose based on your desired look.