Knitting Gauge & Yarn Calculator
Calculates project dimensions based on swatch gauge and estimates yarn requirements. Includes pattern resizing and needle conversion tools.
About
Knitting gauge is the measure of how many stitches and rows fit into a specific unit of length, typically 4 inches or 10 cm. Discrepancies between the pattern gauge and a knitter's personal tension result in ill-fitting garments. A variation of just 0.5 stitches per inch can alter the finished chest circumference of a sweater by several inches.
This tool addresses two problems: determining the number of stitches required for a specific width based on a sample swatch, and resizing patterns when the gauge cannot be matched. It also provides reference data for needle sizes and standard yarn weights.
Formulas
The core calculation for required stitches Sreq based on desired width W and measured gauge stitches Sg over gauge width Wg is:
For pattern resizing, the conversion factor k relates original pattern gauge Gp to user gauge Gu:
Reference Data
| Yarn Weight | Standard Gauge (4in/10cm) | Recommended Needle (Metric) | Approx Yardage (per 100g) |
|---|---|---|---|
| Lace | 33-40 sts | 1.5 - 2.25 mm | 600-800 m |
| Fingering (Sock) | 27-32 sts | 2.25 - 3.25 mm | 360-400 m |
| Sport | 23-26 sts | 3.25 - 3.75 mm | 250-350 m |
| DK (Double Knit) | 21-24 sts | 3.75 - 4.5 mm | 200-250 m |
| Worsted / Aran | 16-20 sts | 4.5 - 5.5 mm | 160-200 m |
| Bulky / Chunky | 12-15 sts | 5.5 - 8.0 mm | 100-150 m |
| Super Bulky | 7-11 sts | 8.0 - 12.0 mm | 50-100 m |