Blocked vs Unblocked Gauge Calculator
Measure your knitting swatch before and after blocking, see how much the fabric changes, and get the stitches and rows to knit so your finished piece comes out the right size.
Check Your Gauge Before and After Blocking
Count the stitches and rows in your swatch, measure it before and after blocking, then enter the finished size you want. The calculator uses your blocked gauge to plan your cast-on.
Gauge Calculator
Use the same unit for every measurement.
Understanding Your Gauge
Why blocking changes the numbers
Knit a Generous Swatch
Use the yarn, needles and stitch pattern from your project. A larger swatch gives a more reliable reading in the centre.
Measure Before Blocking
Lay the swatch flat without stretching it and measure the width of your counted stitches and the height of your counted rows.
Block, Dry and Measure Again
Block the swatch the way you will treat the finished item. Once it is fully dry, measure the same stitches and rows again.
Plan From the Blocked Gauge
Your blocked gauge reflects the finished size, so use it for stitch and row counts. The unblocked size tells you what to expect on the needles.
How Blocking Often Affects Fabric
General tendencies only. Every yarn, needle size and stitch pattern behaves differently, so always swatch and measure your own.
| Fabric Type | Typical Blocking Effect | Why It Matters | Tip |
|---|---|---|---|
| Wool and wool blends | Often relaxes and evens out, and can grow or soften | Finished size may differ from the swatch off the needles | Wash and block the swatch before measuring |
| Cotton and linen | Can stretch or relax, and may grow in length | Garments can lengthen with wear and washing | Re-measure after a wash and dry |
| Silk, bamboo and viscose | Often drapes and lengthens when wet | Rows per unit may change more than stitches | Check row gauge as well as stitch gauge |
| Acrylic and synthetics | May change little with wet blocking | Gauge may match closely before and after | Check the yarn label for blocking advice |
| Lace stitch patterns | Usually opens up and expands noticeably | Large difference between blocked and unblocked size | Pin out to the pattern’s stated dimensions |
| Cables and ribbing | Cables may pull in width, and ribbing can spread when blocked | Width gauge can differ from plain stockinette | Swatch in the exact stitch pattern you’ll use |
Blocked vs Unblocked Gauge FAQ
Answers to common questions about knitting gauge and blocking.
Unblocked gauge is the stitches and rows per unit of length measured on a swatch straight off the needles. Blocked gauge is the same measurement taken after the swatch has been washed or wet, shaped and dried. Many yarns and stitch patterns change size when blocked, so the two gauges can differ.
Your finished item will usually be blocked, so the blocked gauge reflects the size it will actually be. Measuring only the unblocked swatch can leave the finished piece larger or smaller than you planned.
Enter the stitches and rows you counted in your swatch and its measurements before and after blocking. The calculator turns these into gauge, shows the percentage change in width and height, and uses your blocked gauge to work out the stitches to cast on and the rows to knit for your target size.
A swatch of at least 15 to 20 cm (6 to 8 inches) square is a common recommendation, because it lets you measure the middle of the fabric away from the edges. Larger swatches give more reliable gauge.
Block the swatch the same way you plan to block the finished item, for example by soaking, pressing out excess water, shaping and letting it dry flat. Measure only after it is completely dry and has rested.