Percentage Calculator
Solve the three most common percentage problems: what is X% of Y, what percent X is of Y, and percentage increase or decrease between two numbers.
20% of 85
17.00
What Your Result Means
Each mode answers a different question. "What is X% of Y?" finds a portion of a number. "X is what percent of Y?" compares two numbers as a percentage. "Percentage increase/decrease" measures the percent change from one value to another.
How It Is Calculated
X% of Y = (X / 100) × Y
X is what % of Y = (X / Y) × 100
% Change = ((New - Old) / Old) × 100
Worked Example
What is 20% of $85? (20 / 100) × 85 = $17. If a price goes from $85 to $68, that's a change of ((68 - 85) / 85) × 100 = -20%, a 20% decrease.
Important Assumptions
- Percentage increase/decrease uses the "from" value as the base for the percentage.
Frequently Asked Questions
- How do I calculate a discount?
- Use 'What is X% of Y?' to find the discount amount, or try our dedicated Discount Calculator, which also shows the final price directly.
- What if my base value is 0?
- Percentage calculations that divide by zero aren't mathematically defined - Calqora will show 0% in that case rather than an error.
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Methodology
This calculator uses standard percentage formulas. See our methodology page for details.
This calculator provides estimates for general informational purposes only and should not be relied upon as the sole basis for any decision.