Crochet Blanket Size Calculator

The number of starting chains depends on your gauge (stitches per inch) and your desired blanket width, plus a turning chain for your stitch type. For single crochet add 1 extra chain, for half double crochet add 2, and for double crochet add 3. This calculator computes all of that automatically from your swatch measurements.

A gauge swatch tells you exactly how many stitches and rows fit into a given measurement with your specific yarn, hook, and tension. Without it, your finished blanket could end up significantly larger or smaller than intended. Crochet a 4″×4″ (10×10 cm) swatch, measure it carefully, then enter those numbers into the calculator for the most accurate results.

Weigh your swatch and note its dimensions, then compare that weight to the total area of your blanket. The ratio of blanket area to swatch area, multiplied by the swatch weight, gives you the total yarn weight needed. Dividing by the skein weight tells you how many skeins to buy. This calculator does all the math for you — just enter your swatch and skein details.

Common crochet blanket sizes include: Stroller (30″×35″), Baby (32″×40″), Crib (40″×60″), Toddler (35″×48″), Throw (50″×60″), Twin (60″×80″), Full/Double (80″×90″), Queen (90″×108″), and King (108″×108″). You can also enter any custom dimensions in the calculator.

The recommended skeins include a 10% buffer to account for weaving in ends, slight tension differences, and any mistakes you might need to frog and redo. It's always better to have a little extra yarn than to run out mid-project — dye lots can vary between purchases.

The stitch and row math works the same way for knitting. However, the 'starting chain' output is specific to crochet. For knitting, focus on the stitches per row and total rows outputs to determine how many stitches to cast on and how many rows to knit.

Select 'Custom Size' from the blanket size dropdown and enter your exact desired width and length in the fields below. The calculator accepts any dimensions, so you can plan any blanket regardless of size.

Choose the units that match how you measure and how your yarn label is printed. Imperial uses inches, ounces, and yards; metric uses centimeters, grams, and meters. Make sure all your inputs (swatch size, yarn weight, yarn length) use the same unit system for accurate results.