🧰 UtlKit

Percentage Calculator

Calculate percentages instantly — increase, decrease, and more.

What is X% of Y?

% of

💡 Press Enter to calculate

Frequently Asked Questions

How do I calculate percentage increase?

Use the formula: ((New - Original) / Original) × 100. For example, if a price goes from $50 to $75, the increase is ((75-50)/50) × 100 = 50%.

How do I calculate percentage decrease?

Use the formula: ((Original - New) / Original) × 100. For example, if a price drops from $100 to $80, the decrease is ((100-80)/100) × 100 = 20%.

What is X percent of Y?

Multiply Y by (X/100). For example, 25% of 200 = 200 × 0.25 = 50.

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📊 Data Summary (auto-filled)

Tool: percentage-calculator · /tools/percentage-calculator/

mode: percent-of

What is this tool?

Percentage calculator computes percentage-based calculations including X% of Y, what percent X is of Y, and percentage change between two values. It handles common percentage problems like discounts, taxes, tips, interest, and statistical changes. The formula for percentage is: (Part/Whole) × 100.

How to use

  1. 1

    Select calculation type

    Choose: X% of Y, X is what % of Y, or % change from X to Y.

  2. 2

    Enter values

    Input the numbers for your calculation.

  3. 3

    View result

    See the computed percentage with the formula shown.

Frequently Asked Questions

How do I calculate percentage change?

Percentage Change = ((New - Old) / |Old|) × 100. A positive result means increase, negative means decrease. For example, if price goes from $80 to $100, the change is ((100-80)/80) × 100 = 25% increase.

What is 15% of 200?

15% of 200 = (15/100) × 200 = 30. The general formula is: X% of Y = (X/100) × Y = X × Y/100.

How do I calculate what percent one number is of another?

Divide the part by the whole and multiply by 100. Formula: (Part / Whole) × 100. For example, 25 is what percent of 80? Answer: (25 / 80) × 100 = 31.25%. This is useful for grades, budget allocation, survey results, and any scenario where you need to express a part-to-whole relationship.

Why doesn't a 20% increase followed by a 20% decrease get back to the original value?

Percentages apply to different bases. After a 20% increase, 100 becomes 120; a 20% decrease then subtracts 20% of 120 (24), leaving 96. To return to 100 you would need a 25% decrease (25% of 120 = 30).

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