Knitting & crochet calculators

Resizing and shaping math, done exactly. These are the same calculations Purl, GatheredFolk's pattern helper, uses when you ask it to adjust a pattern, so the numbers match wherever you use them.

Gauge calculator
Your gauge doesn't match the pattern's? Get the stitch count that keeps the same finished size.
Pattern resize calculator
Make a piece wider or narrower at the pattern's own gauge, keeping the designer's ease.
Increase & decrease evenly calculator
Spread increases or decreases evenly across a row, or space shaping rows over a length.
Rows for length calculator
How many rows or rounds you need to reach a length at your row gauge.