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About This Tool
Percentage Calculator handles the three core percentage questions: what is X% of Y, X is what percent of Y, and what is the percentage change from X to Y. It covers the calculations most people reach for a spreadsheet to do.
Percentage errors are common in everyday maths — people confuse "10% more" with "10% of." This tool makes the relationship explicit so you get the right answer every time.
Tip: For percentage change such as sales growth, use the change-from-X-to-Y mode. The result is signed — negative means a decrease, positive means an increase.