Gauge help

Hi, I’m not far from a total knitting beginner so I’m sorry if this question seems stupid!

I’m trying to knit a 20 centimetre square. The gauge on the yarn packaging says 9 stitches and 12 rows for a 10 cm square. I thought that doubling the stitches and rows would give me a 20 cm square. The 18 stitches measure 20cm but I’ve gone 24cm rows across and it’s nowhere near the right size, it’s 15 cm across. Surely I can’t be out by 5cm?!
Help!

Hi Bubitron, I don’t know how you measured or what you used to measure your swatch but there’s a very good video on gauge which you can find at the top of this page under the heading ’ Free Knitting Videos’ Scroll down almost to the bottom of the page, it’s worth looking at. Also, you don’t say what yarn or size needles you used for your swatch, everyone’s tension is different and what the yarn band recommends may not be what you need to use to be able to get gauge. You may need to go up or down a needle size (or more!!) depending on your knitting tension (there’s also a video on tension underneath the gauge video)
https://knittinghelp.com/video/play/gauge-basics
ooh! good the link worked :smile: