Calculate stitch and row counts from gauge swatches to resize knitting patterns.
A knitting gauge states how many stitches and rows fit in a 4-inch (10 cm) square, and every number in a pattern derives from that ratio. This calculator takes the pattern's gauge and the gauge you actually produce, then rescales the pattern's stitch and row counts so the finished piece keeps the designer's width and length in your hands. The same calculation handles cast-on counts, panel widths, and target lengths. The surprise for most knitters is direction: a tighter gauge needs more stitches, a looser one needs fewer, and rows follow the same rule vertically.
A concrete input and expected output from the current implementation.
Input
Pattern gauge: 20 sts, 24 rows per 4 in. Your gauge: 22 sts, 26 rows per 4 in. Pattern cast-on: 100 sts. Pattern rows to length: 40.
Expected output
Cast on 110 stitches (100 x 22/20 = 110). Work 43 rows (40 x 26/24 = 43.3, rounded to 43).
Each pattern count is scaled by your gauge divided by the pattern gauge. Your stitch gauge is denser (22 vs 20 per 4 in), so the same width needs 10% more stitches; your row gauge is denser too (26 vs 24), so the same height needs about 8% more rows.
Both gauges are reduced to one unit (stitches per 4 in or per 10 cm), then each pattern count is multiplied by your gauge divided by the pattern gauge. Stitch counts scale the width, row counts scale the height, and the two are computed independently. The result is a proportional count, usually a decimal, that you round in the direction that suits the pattern's repeats and shaping.
Given a desired width or length and your measured gauge, the tool works the other way: it multiplies the target measurement by your stitches (or rows) per inch to return a cast-on or row count from scratch. This is the route for projects with no pattern gauge to match, such as a blanket sized to a bed or a scarf of a specific length.
Yes, if you want the numbers to hold. Unwashed yarn lies differently, and washing can relax, shrink, or grow the fabric, so the swatch should be laundered the same way the finished garment will be and measured dry afterward. Measure a 4-inch (10 cm) square in the middle of a larger swatch. Skipping this step is the most common reason a carefully calculated piece comes out the wrong size.
Fewer. Looser means fewer stitches per inch, so each stitch spans more width and a smaller number reaches the same measurement. The calculator multiplies the pattern's counts by your gauge divided by the pattern gauge, which gives a factor below 1. Row counts behave the same way for heights. Reversing the ratio - a common slip - inflates or shrinks the piece by a surprising amount.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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