Per Centum Now

The term evolved over time. "Per" was often abbreviated to "p", and "cento" was contracted until it eventually became the modern symbol: %.

Parts per 10,000 (one-hundredth of 1 percent). Per Cent Mille (pcm): Parts per 100,000 (1 in 100,000).

The term is conceptually identical to one "cent" being 11001 over 100 end-fraction of a dollar, thus 37 cents is 37 percent of a dollar. Deep Mathematical Meaning

The core, simple formula for a percentage is

"Percent" (one word) is standard American English, while "per cent" (two words) is more common in British English. How to Pronounce Percent - Deep English

If a whole is divided into 100 parts, a "percentage" indicates how many of those parts make up the subset being discussed.

A percentage breaks down any quantity into 100 parts, making it a standardized metric for comparison.

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