Question 1

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

Accepted Answer

To find what percent X is of Y, divide X by Y and multiply by 100. For example, to find what percent 50 is of 200: (50 ÷ 200) × 100 = 25%. Use the 'X is what percent of Y?' calculator for instant results.

Question 2

How do I calculate X% of a number?

Accepted Answer

To calculate X% of Y, multiply Y by X and divide by 100. For example, 25% of 200 = (200 × 25) ÷ 100 = 50. Use the 'What is X% of Y?' calculator for quick calculations.

Question 3

How do I calculate percentage increase or decrease?

Accepted Answer

To calculate percentage change, subtract the original value from the new value, divide by the absolute value of the original, and multiply by 100. For example, from 100 to 150: ((150 - 100) ÷ 100) × 100 = 50% increase. Use the 'Percentage Change' calculator for automatic calculation.

Question 4

Does this calculator store my calculations?

Accepted Answer

Yes, your calculation history is stored locally in your browser using localStorage. This means your data never leaves your device and is completely private. You can view, re-run, or delete previous calculations at any time.

Question 5

Is the percentage calculator free to use?

Accepted Answer

Yes, this percentage calculator is completely free to use. No registration, login, or payment is required. It works entirely in your browser and can even work offline after the initial load.

Percentage Calculator

What is X% of Y?

X is what percent of Y?

Percentage Change