Tools
Three small tools for the maths around a pattern. They run in your browser; nothing is uploaded and nothing is kept.
Chart generator
Type your own counts and the chart redraws, one mark per stitch, forks where the increases fall.
Open the chart generatorGauge calculator
Compare your swatch with the model behind a pattern’s stated size and see how big the finished piece will come out.
Open the gauge calculatorYardage estimator
Add up a pattern’s stitches and turn them into metres of yarn, from a quick measurement of your own.
Open the yardage estimatorThree tools, and what each one can tell you
One draws a round from its counts, one turns counts into centimetres at the gauge you measure, and one works out how much yarn a piece takes. All three run in the browser you are reading this in. Below each is the output it actually produces, run here at build time on this site's own numbers.
The chart generator
The one instrument here that draws rather than calculates. Give it the stitch count of each round and three things come back: the chart, the round-by-round arithmetic written in the three operations these patterns use, and a reading of the shape those counts make — flat, a wall, or a ruffle — from the same geometry check the publish gate runs over every pattern on this site.
| Rnd | Count | What you work |
|---|---|---|
| 1 | 6 | 6sc in a magic ring |
| 2 | 12 | 6inc |
| 3 | 18 | 6inc, 6sc |
| 4 | 24 | 6inc, 12sc |
| 5 | 30 | 6inc, 18sc |
| 6 | 36 | 6inc, 24sc |
126 stitches over 6 rounds. Every round gains exactly 6, which is the rate a circle needs to stay flat as it widens. This is a flat disc.
Open the chart generatorThe gauge calculator
Measure a swatch — how many stitches, and how many centimetres they cover — and it turns any round count into a size. It also does the reverse: how many stitches a disc of a given width needs, and how many rounds a given height takes. Every “~” size in this library was derived from a model rather than measured, so the number the tool exists to show you is the gap between that model and your own hands.
Worked below at the model's own figures for a 4 mm hook, which is what the site assumes when nobody has measured anything: a stitch 0.16 cm wide per mm of hook, and a round 0.8 of a stitch tall.
| What you have | The arithmetic | Comes to |
|---|---|---|
| A 4 mm hook | 4 × 0.16 | 0.64 cm per stitch |
| A round of 36, worked flat | 36 × 0.64 ÷ π | 7.3 cm across |
| 12 rounds stacked | 12 × 0.64 × 0.8 | 6.1 cm tall |
Put your own measurement in place of that first row and every number under it moves. That is the whole tool, and it is the reason to swatch: nobody's hands are the model's.
Open the gauge calculatorThe yardage estimator
Two ways in. Pick a pattern from this site and it adds up the amounts the pattern states, against the ball you actually own. Or measure it yourself — work ten stitches, pull them out, straighten the yarn against a ruler — and it works from your own stitch count, for any project, on this site or not. It gives metres, yards, grams, balls and what those balls cost.
Worked below on Bonsai tree, against a 100 g / 200 m ball:
| Yarn | The pattern says | Metres |
|---|---|---|
| Bark brown — trunk and branches | 1 skein (~50 g) | 100 |
| Cocoa — bark shading and the soil | small amount (~20 g) | 40 |
| Deep jade — the foliage pads | 1 skein (~50 g, all three pads) | 100 |
| Moss green — the speckles in the foliage | small amount (~15 g) | 30 |
| Slate grey — pebbles and the tray rim | small amount (~15 g) | 30 |
| Charcoal — the tray | 1 skein (~40 g) | 80 |
| All 6 lines | 190 g | 380 m — 6 balls |
Each colour rounds up on its own, because a colour cannot be crocheted out of another colour's ball and a dye lot bought later is a different colour. And those grams are the amounts the pattern states: they were drafted from the design, not weighed off a finished piece. Across the library 169 of 424 yarn lines state a weight and 97 state a length instead; the remaining 158 give no usable figure, such as scraps, a short length or a skein with no amount used, and on those the estimator says so rather than inventing one.
Open the yardage estimatorWhat all three do, and what they do not
They run in your browser. There is no account, no email, no sign-up, no watermark and no paid version, and nothing you type is sent anywhere — this site is a set of files with no server behind it, so there is nowhere for it to go. The chart's PNG and SVG carry the drawing, the counts and the key, with nothing written across them.
What is not here: a maker that takes an image and turns it into a square grid, for tapestry, mosaic, pixel or filet work. That is a different instrument and it is not built yet, so nothing above pretends to do it.
Two of these answer a question the patterns raise rather than replace. If a round will not add up, keeping count is where the missing stitch gets found; if the counts are fine and the chart is the puzzle, reading a stitch chart sets one beside its own written rounds.