Global Calculators & Tools

Comprehensive suite of international tools and calculators. Convert currencies & timezones, generate secure passwords, perform scientific calculations, and access essential utilities for personal and professional use worldwide.

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Percentage Calculator

Calculate percentages with step-by-step solutions for all common percentage problems

Choose Operation & Enter Values

Select Calculation Type

🔍What is X% of Y?

25% of 200 = 50

❓X is what % of Y?

50 is 25% of 200

📈Percentage increase

100 to 150 = 50% increase

📉Percentage decrease

200 to 150 = 25% decrease

➕Add X% to Y

200 + 25% = 250

➖Subtract X% from Y

200 - 25% = 150

🔄Percentage change

100 to 80 = -20% change

⚖️Percentage difference

Difference between 100 and 120 = 18.18%

Percentage (%)

Second Value

🔍What is X% of Y?

Find X percent of a number Y

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Select operation and enter values to see results

⚡Quick Examples

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Educational Note

Percentages are ratios expressed as parts of 100. They're fundamental in mathematics, statistics, finance, and everyday life. Understanding different percentage operations helps in making informed decisions in business, academics, and personal finance. Practice with different scenarios to build confidence in percentage calculations.

How Each Percentage Formula Works

This calculator covers the eight most common percentage problems people run into — from finding a percent of a number, to figuring out what percent one value is of another, to calculating growth, discounts and differences. Pick an operation above and the calculator applies the matching formula below.

% of a number: (X ÷ 100) × Y

X is what % of Y: (X ÷ Y) × 100

% increase: ((Y − X) ÷ X) × 100

% decrease: ((X − Y) ÷ X) × 100

Add X% to Y: Y + (X ÷ 100) × Y

Subtract X% from Y: Y − (X ÷ 100) × Y

% change: ((Y − X) ÷ |X|) × 100

% difference: (|Y − X| ÷ ((X+Y)÷2)) × 100

Percentage Calculator FAQs

What's the difference between percentage change and percentage difference?

Percentage change measures directional movement from an original value to a new value, so it can be positive (increase) or negative (decrease), and it's calculated relative to the original value. Percentage difference is a symmetric comparison between two values with no 'before' or 'after', calculated relative to their average, and is always positive.

Why doesn't a 50% increase followed by a 50% decrease return the original value?

Because each percentage is calculated on a different base. Increasing 100 by 50% gives 150, but decreasing 150 by 50% gives 75, not 100 — the base value changed between the two calculations.

How do I calculate a discounted price?

Use the Discount Calculator tab: enter the original price and discount percentage, and it applies the 'subtract X% from Y' formula to show the discount amount and final price directly.

What is the formula for percentage increase or decrease?

Percentage increase is ((new value − original value) ÷ original value) × 100. Percentage decrease uses the same formula with the values reversed: ((original value − new value) ÷ original value) × 100.

Can this calculator handle negative numbers?

Yes, most operations accept negative values, though percentage change and percentage of a number are the most reliable for negative inputs since they use absolute value in the denominator where needed to avoid sign confusion.