Articles & guides
The math and how-to behind your craft — gauge, shaping, yarn estimation, colorwork charts, and turning a photo into a stitchable pattern. Each one pairs with a free calculator that does the arithmetic.
Knitting calculators
Gauge, cast-on, shaping, and yardage — the numbers that make a knit fit before you cast on.
- Article Cast-On & Raglan Calculator Use a knitting cast on calculator to turn gauge and width into an exact stitch count, plus top-down raglan and sock sizing math that makes any project fit.
- Article Free Knitting Calculator Use our free knitting calculator suite to get gauge, cast-on numbers, even increases and decreases, raglan shaping, and yarn yardage right the first time.
- Article Increase & Decrease Calculator Use this decrease calculator knitting tool to space increases and decreases evenly across a row. Free knitting decrease calculator for sleeves and hats.
- Article Knitting Gauge Calculator Use this free knitting gauge calculator to measure your swatch, adjust pattern stitch counts to your tension, and convert between 4-inch and 10-cm gauges.
Yarn math & knitting charts
Estimate yarn, substitute one yarn for another, and chart colorwork in true stitch proportions.
- Guide Knitting Math Knitting math made simple: learn gauge, stitch counts, shaping increases and decreases, sizing, and yarn quantity, with free calculators that do the work.
- Article Colorwork Yarn Estimation Per-color yarn math for tapestry, mosaic, fair isle, c2c, and graphgan — with formulas, buffers, and worked examples.
- Article Knitting Chart Maker & Pattern Generator Use our free knitting chart maker to design colorwork and stitch charts in true gauge proportions, then export printable charts and written instructions.
- Article Yarn Substitution Calculator Use this yarn substitution calculator to swap one yarn for another safely: match weight and grist, recheck gauge, and recalculate the skeins you need.
- Article Yarn Yardage Calculator Use a yarn yardage calculator to estimate exactly how much yarn your project needs by size, gauge, or swatch weight, so you never run short or overbuy.
Crochet chart & graph makers
Turn ideas, grids, or photos into accurate, printable crochet charts.
- Article Crochet Chart Maker Use a free online crochet chart maker to build symbol, filet, and color charts. Design accurate, printable crochet patterns in true stitch proportions.
- Article Crochet Graph Maker Use our free crochet graph maker to build grid and pixel charts that match your real stitches. Design colorwork, plan yarn per color, and print clean charts.
- Article Crochet Pattern Maker Use a free crochet pattern maker to turn ideas, sketches, or photos into accurate, printable crochet charts with true stitch proportions and yarn estimates.
- Article Picture to Crochet Pattern Turn any picture to crochet pattern free with StitchSums. Learn how image pixels map to stitches, reduce colors to a yarn palette, and fix aspect ratio.
Tapestry & mosaic crochet
Read, find, and design colorwork crochet — with aspect-ratio-correct charts and per-color yarn.
- Guide Tapestry Crochet Patterns Learn to read, find, and design tapestry crochet patterns. Free charts, a beginner how-to, and a pattern maker that auto-corrects stitch aspect ratio.
- Article Mosaic Crochet Pattern Generator Use the StitchSums mosaic crochet pattern generator to build valid overlay and inset mosaic charts, track the two-row color rhythm, and estimate yarn per color.
- Article Tapestry Crochet Pattern Maker A free crochet tapestry pattern maker that draws your chart in true stitch proportions, so circles stay round and your finished design looks exactly as planned.
C2C, graphgan & cross-stitch
Pixel-and-tile generators for blankets, graphgans, and cross-stitch charts.
- Article C2C Crochet Pattern Maker Turn any grid or image into a ready-to-stitch chart with our free c2c crochet pattern maker, with row-by-row block counts and per-color yarn estimates.
- Article Cross-Stitch Pattern Maker Turn a photo into a stitchable chart with the StitchSums cross stitch pattern maker: DMC floss matching, symbol charts, fabric sizing, and skein estimates.
- Article Graphgan Maker Learn how graphgan patterns crochet work, then build your own with the free StitchSums graphgan maker: proportion-correct charts and per-color yarn estimates.