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Percentage Calculator

Quickly solve common percentage problems: find a percentage of a number, determine what percent one number is of another, calculate percentage change, or increase and decrease a value by a given percentage. Results update instantly as you type.

Result —

Formula: X% of Y = (X ÷ 100) × Y

Result —

Formula: (X ÷ Y) × 100 = percentage

Change —
Direction —

Formula: ((New − Original) ÷ |Original|) × 100

After increase —
After decrease —

Increase: Number × (1 + Pct/100)  |  Decrease: Number × (1 − Pct/100)

About This Calculator

Percentages appear everywhere in daily life — from calculating discounts and tips to understanding tax rates, exam scores, and investment returns. This calculator covers the four most common percentage operations so you never have to second-guess the math. Simply pick a mode, enter your numbers, and get an instant answer. All calculations run locally in your browser; nothing is sent to a server.

FAQ

How do I calculate X% of a number?
Divide the percentage by 100 and multiply by the number. For example, 25% of 200 = (25 ÷ 100) × 200 = 50. Use the first tab above for instant results.
How do I find percentage change?
Subtract the original value from the new value, divide by the absolute value of the original, then multiply by 100. A positive result means an increase; a negative result means a decrease.
What is the difference between percentage change and percentage points?
Percentage change compares two values relative to the original (e.g., going from 40% to 50% is a 25% increase). Percentage points measure the absolute difference between two percentages (e.g., 50% − 40% = 10 percentage points). They are not interchangeable.
Can I use negative numbers?
Yes. Negative inputs are valid in all modes. For example, a percentage change from −20 to 10 correctly shows a 150% increase.

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