Calculate percentages, percentage change, and percentage of a number. Solve any percentage problem instantly.
Enter your values
Open the Percentage Calculator and fill in the required input fields with your numbers or selections.
Review the calculation
The tool automatically computes the result as you type. Double-check your inputs to ensure accuracy.
Interpret your results
Review the calculated output along with any breakdowns, charts, or explanations provided to understand what the numbers mean for your situation.
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Percentages are one of the most commonly used mathematical concepts in everyday life, from calculating discounts and tax to understanding statistics and financial growth. This calculator covers the four most common percentage problems.
Result = Y ร (X / 100)Percentage = (X / Y) ร 100Base = X / (Y / 100)% Change = ((New - Old) / |Old|) ร 100Some everyday uses of percentages include: calculating sales tax (e.g., 8.25% of $49.99), figuring out discounts (e.g., 30% off $120), determining tips (e.g., 20% of a $75 restaurant bill), computing grade percentages (e.g., 45 out of 50 questions), and understanding investment returns (e.g., a stock rising from $50 to $65).
A percentage increase of 50% means the new value is 150% of the original. A percentage decrease of 50% means the new value is 50% of the original. Note that a 50% increase followed by a 50% decrease does not return you to the original number. For example, $100 increased by 50% becomes $150. That $150 decreased by 50% is only $75, not $100. This asymmetry is important in finance and statistics.
A common source of confusion is the difference between "percentage points" and "percentages." If an interest rate increases from 5% to 7%, it has increased by 2 percentage points but by 40% in relative terms (2/5 = 0.40). News reports and financial data often mix these terms, so pay attention to which one is being used.