How to calculate it
Stitches per inch = swatch stitches ÷ swatch width. Rows per inch = swatch rows ÷ swatch height. Multiply each rate by its target dimension, then round up to whole stitches and rows.
Worked example
A 4 in swatch with 18 stitches and 20 rows has 4.5 stitches and 5 rows per inch. A 30 × 40 in project estimates 135 stitches and 200 rows.
Before you cut or buy
- Measure a washed, relaxed swatch in the stitch pattern you plan to use.
- Edges, shaping and stitch repeats can change the starting count; use the starting-chain calculator for repeat alignment.
Common questions
Should I measure crochet gauge before or after blocking?
Use a swatch prepared the same way you will finish the project. Washing and blocking can change both stitch and row gauge, particularly with fibers that relax.
Why is my final width different from the estimate?
Gauge can change with hook, yarn, stitch pattern or tension over a large piece. The result assumes your measured swatch rate remains constant; check the work periodically.
Use your own measured materials and pattern instructions. Estimates cannot account for every variation in technique, shrinkage or layout.