4 Knitting Formulas That Make Customizing Patterns Easy
If the word “math” makes you want to hide behind your yarn stash — don’t worry. These 4 simple knitting formulas are more like creative tools than schoolwork. They help you customize patterns, make your knits fit better, and boost your confidence — even if you're not a "math person." This post is all about using knitting formulas to free your creativity.
1. How to Convert cm to Stitches
Formula: cm × gauge ÷ 10 = number of stitches Want your sweater to be 50 cm wide and your gauge is 18 sts per 10 cm? 50 × 18 ÷ 10 = 90 stitches to cast on.
Use it when: Casting on, modifying widths, or designing from scratch.
2. How to Convert Stitches to cm
Formula: stitches × gauge ÷ 10 = cm Picked up 112 stitches and wondering how wide that really is? 112 × 18 ÷ 10 = about 201.6 cm.
Use it when: Checking fit or verifying stitch counts in custom knits.
3. How to Adjust Gauge by Knitting a Different Size
Formula: desired size ÷ your gauge × pattern gauge = pattern size Want 120 cm bust, pattern gauge is 20 sts, your gauge is 14 sts? 120 ÷ 14 × 20 = knit the smallest pattern size.
Use it when: You like the pattern but want a looser or tighter fabric.
4. How to Adjust Length Based on Row Gauge
Formula: (cm to add/remove × row gauge) ÷ 10 = rows to add/remove Need to shorten by 6 cm, row gauge is 26? 6 × 26 ÷ 10 = remove 15-16 rows.
Use it when: Changing cardigan or sleeve lengths in textured knits.
Math as a Tool, Not a Rule
You don’t need to be a math wizard to make these formulas work. You just need to:
Swatch honestly (no wishful thinking!)
Use stitch markers to track increases
Stay flexible — adjust as you go
Grab the Cheat Sheet
Want all these formulas in one place? I’ve created cheat sheet you can find in this instagram post!
This post was all about simple knitting formulas that make customizing easier.
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