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Pro Tip
Measure both feet — they often differ by half a size. Buy for the larger foot. Measure in late afternoon when feet are at their largest from daily activity and walking-induced swelling. For online shopping, prioritize retailers with free returns (Zappos, Nordstrom) when uncertain about fit — the cost of return shipping is far less than the cost of unwearable shoes that don't fit.
Did you know?
King Edward II of England decreed in 1324 that 3 dried barleycorns equal 1 inch — this is the origin of UK shoe sizing. Each size increment corresponds to 1 barleycorn (about 8.46mm). Despite seven centuries of metric standardization and ISO efforts to introduce Mondopoint, UK shoe sizes remain barleycorn-based today. This is why UK sizes use unusual half-size precision (½ barleycorn intervals) and why size 0 is a real starting point (representing 0 barleycorns above an arbitrary baseline foot length). The British shoe industry's resistance to metric conversion is one of the longest-running examples of measurement-system tradition in commerce.
References
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