How do you calculate what is X% of Y?

Multiply the percentage (X) by the total number (Y) and divide by 100. Formula: (X * Y) / 100.

How do you calculate percentage increase or decrease?

Subtract the initial value from the final value, divide by the initial value, and multiply by 100. Formula: ((Final - Initial) / Initial) * 100.

Home / Percentage Calculator

Online Percentage Calculator

4 quick calculation modes: calculate percentages of numbers, percentage change, and fractions in real-time.

Instant Results Private & Free

What is X% of Y?

Basic %

Percentage (%):

Of Number:

Result: 375

15% of 2,500 = 375

X is what % of Y?

Fraction to %

Value (X):

Total (Y):

Result: 25%

450 is 25% of 1,800

Percentage Increase / Decrease

% Change

From (Initial):

To (Final):

Percentage Change: +50.00%

Increase of 50 (from 100 to 150)

Add or Subtract %

Markup / Discount

Base Number:

Action:

Percentage (%):

Final Value: 600

500 + 20% (100) = 600

Percentage Formulas & Mathematical Rules

1. Calculating Percentage of a Number

To calculate $P\%$ of a number $N$:

Result = (P × N) ÷ 100

2. Calculating What Percentage X is of Y

To find what fraction $X$ represents out of total $Y$:

Percentage (%) = (X ÷ Y) × 100

3. Percentage Increase

When value rises from $V_1$ to $V_2$:

% Increase = ((V₂ - V₁) ÷ V₁) × 100

4. Percentage Decrease

When value drops from $V_1$ to $V_2$:

% Decrease = ((V₁ - V₂) ÷ V₁) × 100

Frequently Asked Questions (FAQs)

What does "Percentage" mean?

The word "percent" comes from the Latin per centum, meaning "by the hundred". A percentage is simply a ratio or fraction whose denominator is always 100.

How do I convert a fraction into a percentage?

Divide the numerator by the denominator, then multiply by 100. For example, 3/4 = 0.75 * 100 = 75%.