I find it really annoying to have to calculate grid widths — especially within nested spaces — within my designs without ending up with crazy numbers of vertical guides or guide shapes.
After not finding a tool that worked exactly how I wanted it too, we at Big Bite created Grid.Guide to solve the problem for us.
It uses a max width and column count to calculate possible whole pixel column and gutter width combinations. It generates PNGs so you can drag or copy them straight into your designs.
It’s free to use so please have a go and let us know if you like it. If there’s a feature you’d like to see to help it adapt into your style, we’d love to know so please comment :)
Check it out at Grid.Guide.