Crochet Gauge Calculator
Turn your crochet gauge swatch into the exact stitch and row counts for any finished size — chain length, stitches per row and rows to work.
How it works
stitches per inch = swatch stitches ÷ swatch width · rows per inch = swatch rows ÷ swatch height · start stitches = round(sts/in × target width) · rows = round(rows/in × target height)
Gauge is the bridge between a pattern and your own hands: the same hook and yarn produce different sizes for a tight crocheter and a loose one, so you always measure a swatch and scale from it. Divide the swatch stitch count by its width to get stitches per inch, do the same for rows, and multiply by the finished dimensions you want. Because crochet stitches are usually wider than they are tall, the stitch and row gauges differ — that is why the calculator handles width and height separately rather than assuming square stitches.
Worked example
A swatch of 16 stitches and 20 rows measures 4×4 in, so gauge is 4 stitches and 5 rows per inch. For a 20×15 in panel: starting chain = round(4 × 20) = 80 stitches, and rows = round(5 × 15) = 75 rows.
Frequently asked questions
Why does my finished piece come out the wrong size?
Almost always a gauge mismatch. If your stitches-per-inch differs from the pattern, the piece scales up or down. Re-measure a blocked swatch and change hook size until your gauge matches, or use this calculator to recompute the stitch counts for your gauge.
Should I block the swatch before measuring?
Yes — block it the same way you will block the finished item. Many yarns relax and grow when washed, and measuring an unblocked swatch overstates your stitches per inch.
Do I add stitches for a border or seam?
This gives the stitch count for the finished body dimension. Add any turning chains, edging or seam allowance your pattern calls for on top of it.
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This calculator is for educational purposes. Double-check important results before acting on them.