How do I calculate percentage change?

Enter the old value and new value. The calculator shows the percentage change, whether it is an increase or decrease, and the exact difference.

What is the percentage change formula?

Percentage Change = ((New Value - Old Value) / Old Value) x 100. A positive result indicates an increase, and a negative result indicates a decrease.

Can I find what X% of Y is?

Yes, use the reverse calculator section. Enter a percentage and a value to find what that percentage of the value equals.

Does it handle negative numbers?

Yes, the calculator works with both positive and negative numbers for all calculations.

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Percentage Change Calculator — Increase & Decrease

Calculate percentage change between two values. Also find what is X% of Y. Shows increase or decrease with the exact difference.

Percentage Change

Old Value

New Value

What is X% of Y?

Percentage (%)

Of Value

What do you want to do next?

Percentage Calculator Discount Calculator

Percentage Change Calculator

Calculate the percentage change between two values instantly. Useful for tracking price changes, salary increases, test score improvements, and more. The tool also includes a reverse calculator to find what X% of any number is.

The Formula

Percentage Change = ((New Value - Old Value) / Old Value) x 100. A positive result means an increase, and a negative result means a decrease.

Frequently Asked Questions

Enter the old value and new value. The calculator shows the percentage change instantly.

Percentage Change = ((New - Old) / Old) x 100. Positive = increase, negative = decrease.

Yes, use the reverse calculator section below the main calculator.

Yes, the calculator works with both positive and negative numbers.

Last updated: June 2026