What is a good percentage increase?

It depends on context. In business, 10-20% annual growth is strong. In investing, 7-10% average annual return is typical for stock markets. For prices, any increase above inflation (2-3%) is notable.

How do I calculate reverse percentage?

If a value increased by X% to reach a final amount, divide the final amount by (1 + X/100). For example, if 65 is after a 30% increase: 65 / 1.30 = 50 original.

What is percentage difference vs percentage change?

Percentage change uses the original value as the base. Percentage difference uses the average of both values as the base. Use change for time comparisons (price last year vs now), and difference for comparing two unrelated values.

Percentage Change Calculator

Calculate percentage increase or decrease with a visual before/after comparison. Three calculation modes plus a reverse calculator.

Old Value

New Value

Original Value

Increase by (%)

Original Value

Decrease by (%)

Percentage Change (%)

Final Value

+30%

Change: +15.00

(65 - 50) / 50 × 100 = 30%

Before vs After

Before

After

+15.00 (30%)

How to Calculate Percentage Change

The formula and steps to find percentage change between any two values.

The Formula

Percentage Change = ((New Value - Old Value) / Old Value) × 100

A positive result means an increase, a negative result means a decrease.

Step by Step

Find the difference: Subtract the old value from the new value
Divide by the original: Divide the difference by the old value
Convert to percentage: Multiply by 100 to get the percentage

Common Examples

Real-world scenarios for percentage change calculations.

📈

Stock Price Increase

50 → 65

+30%

📉

Sale Discount

100 → 75

-25%

📊

Revenue Growth

10K → 14K

+40%

Frequently Asked Questions

Common questions about percentage change calculations.

Subtract the old value from the new value, divide by the old value, then multiply by 100. Formula: (new − old) ÷ old × 100. A positive result means an increase, negative means a decrease.

Percentage change expresses the relative change between two values (e.g., a rate going from 10% to 15% is a 50% increase). Percentage points measure the absolute difference (15% − 10% = 5 percentage points). They are not the same.

To reverse-calculate the original value: final value ÷ (1 + percentage/100). For example, if a final value of 120 resulted from a 20% increase, the original is 120 ÷ 1.20 = 100. Use the "Reverse" mode in this calculator.

Yes. Percentage change works for any numeric values — stock prices, population, exam scores, revenue, temperature, or any other measurable quantity. The calculator is value-agnostic.