I am designing a web interface where we have filters on left side and search results on remaining page. How much page's space should left filters take? Any percentage?
closed as primarily opinion-based by maxathousand, Shreyas Tripathy, locationunknown, Wanda, Ken Mohnkern May 10 at 17:43
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300px is a good choice. Depending on the font-size and letter-spacing, you may need slightly more or less.
A width between 20% and 40% is usually the best choice for a single sidebar and if you're going to use more than one sidebar, I suggest you don't exceed a total width of 50% (20% + 20% and 15% + 35%, for example).
For a single sidebar, you can also utilize the Golden Ratio approach, where the width of the sidebar is around 38% of the main content area's width. You can find more information about Golden Ratio in Jarel Remick's The Golden Ratio in Web Design article at Nettuts+.