๐งถ Knitting Gauge Calculator
Gauge (measured from your swatch)
Desired finished size
Any consistent unit works (e.g. cm) โ just use the same unit for all values.
Enter the stitches and rows you measured on a gauge swatch along with the size they correspond to, and your desired finished width and height, to calculate how many stitches to cast on and how many rows to knit.
How to use
- Enter the stitch count from your gauge swatch and the width (e.g. in cm) it corresponds to.
- Enter the row count from your gauge swatch and the height it corresponds to.
- Enter your desired finished width and height.
- The stitches to cast on and rows to knit are calculated automatically.
How the calculation works
Gauge describes how dense a piece of knitting is, usually given as the number of stitches and rows in a 10cm square. Even with the same yarn and needle size, gauge varies with how tightly an individual knits, which is why knitting a test swatch and measuring it is the standard first step in any project. The calculation itself is simple proportion. With s stitches measured across a width w, the stitches per centimetre is s รท w. Multiply by your target width W and you get the stitches required: (s รท w) ร W. Rows work the same way, using the row count and the height it spans. This proportion holds on the assumption that the fabric is knitted at a uniform density throughout. Ribbing, cables and other stitch patterns that pull the fabric in or stretch it will finish at dimensions that differ from the calculated values.
Worked example
Gauge of 20 stitches and 28 rows per 10cm, target 50cm wide by 60cm tall 1. Stitches per cm: 20 รท 10 = 2 2. Stitches needed: 2 ร 50 = 100 3. Rows per cm: 28 รท 10 = 2.8 4. Rows needed: 2.8 ร 60 = 168 Cast on 100 stitches and knit 168 rows. At a gauge of 18 stitches per 10cm instead, the same 50cm width needs 1.8 ร 50 = 90 stitches โ ten fewer. A small difference in gauge changes the stitch count noticeably, which is exactly why the swatch matters.
Things to be aware of
- Always measure gauge from your own swatch. The figure on the yarn label is a guide and shifts with individual tension.
- Edge stitches distort, so knit a slightly oversized swatch and measure across the middle.
- Ribbing, cables and similar patterns will not finish at the calculated size. Take your gauge in the same stitch pattern you plan to use.
- Results are rounded to whole numbers. If your stitch pattern needs a multiple of a certain number, adjust to the nearest multiple.
FAQ
What is gauge?
Gauge is a measure of knitting density, usually expressed as stitches and rows per 10cm square. It varies with your yarn, needles, and knitting style, so it's best measured from an actual test swatch.
What formula is used?
Stitches to cast on = (gauge stitches รท gauge width) ร desired width. Rows to knit = (gauge rows รท gauge height) ร desired height. Both are rounded to the nearest whole number โ simple proportional math assuming gauge scales linearly with size.
Can I use units other than cm?
Yes โ any unit works, as long as you use the same unit consistently for both the gauge measurements and the desired size.