Percentage Calculator

What is the Percentage Calculator?

Percentages come up constantly — exam scores, discounts, tax rates, tip amounts, interest calculations. A percentage calculator removes the mental gymnastics. It handles three common types of questions: 'What is X% of Y?', 'X is what percent of Y?', and 'What is the percentage change between two values?' CalciHub's tool covers all three in a single page, so you don't need separate tools for each scenario.

How Does It Work?

Each question type uses its own formula:

What is X% of Y? Result = (X / 100) × Y

X is what % of Y? Result = (X / Y) × 100

Percentage change: Result = ((New − Old) / Old) × 100

X = the percentage or partial value

Y = the base or whole value

Old = original value (for change calculations)

New = updated value (for change calculations)

How to Use CalciHub's Percentage Calculator

1. Select which type of percentage question you want to answer.

2. Enter the required numbers in the fields that appear.

3. Click Calculate to see the result.

4. Use the Clear button to reset and try a different scenario.

5. Switch between question types without reloading the page.

Tip: For percentage change, make sure you enter the original value first and the new value second — reversing them gives a different (and incorrect) result.

A Quick Example

A product originally costs 80. It is now on sale for 68. What is the discount percentage?

Formula: ((Old − New) / Old) × 100

= ((80 − 68) / 80) × 100

= (12 / 80) × 100

= 15%

The item is discounted by 15%. Knowing this helps compare deals across different products, where the raw price drop alone can be misleading.

Frequently Asked Questions