[[File:FolioA4.svg|thumb|A comparison of the A4 and Foolscap folio papersize]]
'''Foolscap folio''' (commonly contracted to '''foolscap''' or '''folio''' and in short '''FC''') is [[paper]] cut to the size of {{convertcvt|8+1/2|xx|13+1/2|in|0}} (for "normal"printing writingor paper,to {{convertcvt|138|xx|813|in|abbr=on}}) for "normal" writing paper. This was a traditional [[paper size]] used in Europe and the British Commonwealth, before the adoption of the international standard [[A4 paper]].
A full (''plano'') foolscap paper sheet is actually {{convert|17|xxcvt|13+1/2|xx|17|in|0}} in size, and a [[folio (printing)|folio]] sheet of any type is half the standardbase sheet size or a subdivision of this into halves, quarters and so on.
Ring binders or lever arch files designed to hold foolscap folios are often used to hold A4 paper ({{convertcvt|210|xx|297|mm|disp=comma|abbr=on|frac=8}}). The slightly larger size of such a binder offers greater protection to the edges of the pages it contains.
