Percent Calculator

Solve all types of percentage problems instantly — find percentages, changes, increases, and decreases.

What is P% of X?

What is % of ?

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X is what % of Y?

is what % of ?

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Percentage Change from X to Y

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Percentage Change

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X Increased / Decreased by P%

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Original

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Change Amount

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Learn

Everything You Need to Know About Percentages

A percentage is a way of expressing a number as a fraction of 100. The word comes from the Latin per centum meaning "by the hundred." Percentages are used everywhere — from calculating discounts and sales tax to understanding interest rates, test scores, and statistics.

Our Percent Calculator handles the four most common percentage problems you encounter in daily life: finding a percentage of a number, expressing a ratio as a percentage, calculating the percentage change between two values, and finding the result of a percentage increase or decrease.

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Shopping Discounts

Quickly find out how much you save. If a $120 jacket is 25% off, use "X increased by P%" in reverse — or find 25% of 120 = $30 savings, making the final price $90.

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Grade & Score Analysis

If you scored 47 out of 60, use "X is what % of Y?" to find 47 ÷ 60 × 100 = 78.3%. This is your raw percentage score before any curve.

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Investment Returns

Track portfolio performance with percentage change. If your investment grew from $5,000 to $6,250, the percentage change is +25% — a strong annual return by any measure.

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Tips & Tax

In restaurants, 15% tip on a $68 bill = $10.20. For a 20% tip = $13.60. Use "What is P% of X?" for instant tip calculations without mental math.

FAQ

Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 30% of 250 = 250 × 30 ÷ 100 = 75. Alternatively, convert the percentage to a decimal (30% = 0.30) and multiply: 250 × 0.30 = 75.

What is the formula for percentage change?

Percentage Change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result means an increase; negative means a decrease. For example, from 80 to 100: (100−80)/80 × 100 = +25%. From 100 to 80: (80−100)/100 × 100 = −20%.

How do I find what percentage X is of Y?

Divide X by Y, then multiply by 100: (X ÷ Y) × 100. Example: 15 is what percent of 60? → (15 ÷ 60) × 100 = 25%. This is commonly used for grades, ratios, and proportional comparisons.

How do I reverse-calculate a percentage?

If a value after a 20% discount is $80 and you want the original price, divide by (1 − 0.20) = $80 ÷ 0.80 = $100. Similarly, if a value after a 15% increase is $115, the original is $115 ÷ 1.15 ≈ $100. This is called working backwards from a percentage change.

What is the difference between percentage point and percent change?

A percentage point is an absolute difference between two percentages. If interest rates rise from 2% to 5%, that's a 3 percentage point increase — but a 150% relative change. Percent change is relative: (5−2)/2 × 100 = 150%. The distinction matters greatly in finance and statistics reporting.