Essential calculators to help you adjust patterns, calculate gauge, and plan perfect shaping — precision yarn math at your fingertips.
Calculate evenly spaced increases or decreases across any row.
Adjust pattern stitch counts to match your actual gauge swatch.
Custom knitting pattern generator for any yarn & size.
Calculate row intervals for perfectly shaped sleeve shaping.
Standard sizes & cast-on calculator for knitted blankets.
Calculate starting chains for crochet blankets of any size.
Calculate yarn amounts when swapping brands or weights.
Estimate yardage needed for any knitting or crochet project.
Calculate cast-on stitches for any scarf width and yarn weight.
Standard foot measurements and stitch counts for sock knitting.
Plan colors and layout for granny square blankets.
Accurate yarn math is the invisible backbone of every successful knitting or crochet project. Even a small deviation in your knitting gauge — a single extra stitch per inch — can result in a sweater that's several sizes too large or too small by the time you cast off. Our free knitting gauge calculator removes that guesswork entirely: simply enter your swatch measurements and the tool instantly recalculates every stitch count in your pattern to match your actual tension. No more frogging a nearly-finished sleeve because the numbers were off from the start.
Shaping is where most knitters encounter the dreaded "decrease evenly across the row" instruction with no further guidance. Our decrease calculator — and its mirror tool for increases — solves this in seconds: input your current stitch count and target count, and get a precise, row-by-row spacing plan. The same logic powers the Sleeve Decrease tool, which converts your measurement goals into exact row intervals for tapered, professional-looking sleeves. Whether you're tackling your first top-down raglan or a custom granny-square blanket, every calculator here is built to handle the fiddly yarn math so you can focus entirely on the craft.