I need to make a really big sphere

[madhatter_kid]

I wanted to make a katamari pillow for my boyfriend for Christmas! I figured i should start now, but every time i try to make a big circle to start off with it gets all wonky. What should i do to fix this? And I'm thinking i want the circle to be as big as about the bottom of a lampshade ( http://www.instructables.com/image/F1QN9P9FUVSGU9D/Use-Circle-Shapes-to-Make-Round-Pillow-Pieces-Look.jpg ) This. It would be great if you guys could help

[fantasticmio]

Are you trying to make a circle (2D) or a sphere (3D)?  What stitch are you using?

[megziewoodles]

For a flat circle, I usually increase six times in every round using single crochet. It makes more of a hexagon, but you can block it to the right shape.

[fantasticmio]

For a circle, the usual math is:

sc: start with 6, increase by 6 every round
hdc: start with 8, increase by 8 every round
dc: start with 12, increase by 12 every round

A way to avoid ending up with a hexagon/octagon/dodecagon instead, is to make sure that the increases you're doing in the current round aren't stacked on top of the increases of the previous round.  This is easier to do the more rounds you do.  Just make sure the increases are evenly spaced, no matter where you put them. ^_^