All Calculators

Five calculators, all running entirely in your browser, all built on the same tested calculation library so a number you get from one tool never contradicts what a different tool on this site would tell you about the same project.

Yarn Quantity Estimator

Two modes: a gauge-based model (StitchHow's own calibrated calculation, fully documented on the methodology page) for planning before you buy yarn, and a swatch-weighing mode that needs no calibrated constant at all — the accurate path once you've actually got yarn and a swatch in hand. Open the tool.

Gauge Conversion Calculator

Rescales a pattern's stitch or row counts to your own measured gauge, when it doesn't match what the pattern assumes. Useful the moment your swatch comes out even slightly different from a pattern's stated gauge — which is close to every project, if you swatch honestly. Open the tool.

Cast-On Calculator

Solves the specific problem of a raw gauge-math stitch count landing on a number your rib or texture pattern can't actually use — every valid repeat has its own number line, and this tool finds the nearest point on it instead of leaving you to round by guesswork. Open the tool.

Stitch & Row Spacer

Generates the actual written instruction for an evenly spaced decrease or increase row or a shaping sequence across multiple rows — remainder distribution included, not just a bald target stitch count. Open the tool.

Needle & Hook Size Converter

Moves between US, metric, and UK/Canada (old) sizing for both knitting needles and crochet hooks, using the standard published equivalence chart. The UK old numbers get smaller as the actual needle gets bigger, backwards from what most people assume, and that's exactly the mistake this tool is built to prevent. Open the tool.

Which tool to start with

No yarn purchased yet? Start with the Yarn Quantity Estimator, left in its default gauge-based mode. Already swatched with real yarn in hand? Switch that same tool to swatch-weighing instead — see the tool's own page for why that mode is the more trustworthy of the two. Numbers not adding up against a pattern you're following? That's a job for the Gauge Conversion Calculator, before a single stitch goes on the needle.

FAQ

Are any of these calculators knitting-only? No — every tool that depends on stitch pattern, the Yarn Quantity Estimator and Cast-On Calculator specifically, asks which craft you're working in and adjusts its math accordingly, rather than quietly assuming knitting and leaving crocheters to guess at a conversion factor.

Is any of my data saved when I use a calculator? No — every calculation runs client-side in your browser. Nothing you enter is sent to a server or stored anywhere.