# Percentage calculator

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### What is percentage?

Percentage is a number (or ratio) expressed as a fraction of 100. It is often denoted using the percent sign, %, or the abbreviation pct.For example, 12% (read as 'twelve percent') is equal to 12/100, or 3/25, or 0.12.

Percent is sometimes written as two words 'per cent' and means 'per hundred'.

Percentages are used to express how large or small one quantity is relative to another quantity.