🧶 Yarn Weight Pattern Scaler

Convert a crochet pattern from one yarn weight to another using real gauge measurements, not yarn labels.

Step 1 · Add your pattern

📄 Drop a pattern PDF (or .txt) here, or click to choose

Text-based PDFs work best. Scanned or image-only PDFs have no text to read, so paste the text instead. Everything runs in your browser; nothing is uploaded.

Pattern text (edit freely)

Tips: start a section with a heading line (e.g. BODY or Sleeves:). Tag a stitch multiple on its own line like [multiple of 10 + 3] and it applies until [multiple off] or the next tag.

Step 2 · Original yarn & gauge

Yarn weight (preset estimate)

Original yarn name / weight

Hook size

Stitches in swatch

Rows in swatch

Step 2 · Target yarn & gauge

Yarn weight (preset estimate)

Target yarn name / weight

Hook size

Stitches in swatch

Rows in swatch

Gauge unit

Swatch width (in)

Swatch height (in)

Preset gauges are typical single-crochet estimates over 4 in (10 cm). For accurate results, crochet and measure your own swatch in each yarn, and enter the real counts above.

Width ratio
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Height ratio
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Step 3 · Options & section adjustments

Leave counts smaller than alone Snap direction Snap every stitch count to the multiple (not just foundation chains and totals)

Small numbers like turning chains (ch 1–3) and "2 sc" repeats are structural, so they stay put. Click any highlighted number in the results to lock or unlock it.

Results

12 original9 scaled11 snapped to multiple3 locked/skipped

Always re-read the scaled pattern and make a swatch. Repeat counts ("repeat 5 times"), shaping and stitch-pattern repeats may need a manual check.