Why gauge matters
If you have more stitches per inch than the pattern, the same cast-on makes a narrower fabric. Resizing multiplies pattern stitches by (your sts per 4") / (pattern sts per 4").
Formulas
sts/in = swatch_stitches ÷ swatch_width_in; target stitches = round(target_width_in × sts/in); resized stitches = round(pattern_stitches × your_sts4 / pattern_sts4).
Worked example
20 stitches over 4" → 5 sts/in. For a 20" width you cast on 100 stitches. If the pattern assumes 18 sts/4" and you get 20, multiply stitch counts by 20/18.
Tips
Wash and block the swatch as you will the garment. Measure center stitches, not edges.
Common mistakes
Measuring a tiny swatch; counting the cast-on edge as a stitch row.
Blocking and measurement practice
Swatch in the same stitch pattern as the project fabric (ribbing pulls in; cables draw width). Use the needles you plan to use. Count over 4" with pins marking the edges of the counted stitches. If your row gauge differs, adjust length in pattern instructions rather than forcing needle changes that break stitch gauge. For circular projects, a flat swatch can still be indicative if tension matches.
Limits and how to use the results
Estimates run only in your browser. Prefer a published pattern’s tested yardage when it conflicts with this planner. Density factors and assumptions are documented on the methodology page; legal terms cover planning-use limits.
FAQ
How do I measure knitting gauge?
Knit a swatch at least 4–6" wide, block it, then count stitches and rows over 4 inches in the center.
What if row gauge is off but stitch gauge matches?
Adjust length by working fewer or more rows; stitch gauge controls width.