Simplify your math with this easy-to-use Percentage Calculator. It helps you find percentage changes quickly and accurately for any situation.

How To Use The Calculator 

• Select the type of percentage calculation you need
• Enter the required numbers in the input boxes
• Click the Calculate button to get your result
• Clear the fields to do another calculation

What Is Percent Change?

Percent change shows how much a value has increased or decreased compared to its starting point. It’s useful in tracking changes over time, whether in prices, scores, or other data.

You can calculate percent change with this formula:

((new value - original value) / original value) × 100

A positive result means there’s an increase. A negative result means there’s a decrease.

Why Percent Change Matters

Understanding percent change helps you make sense of trends. It’s a simple way to see growth or decline without diving into complex numbers. Whether you’re comparing costs, tracking performance, or analyzing data, percent change gives you a clear picture.

How to Calculate Percent Change

Here’s a step-by-step method:

1. Identify the original value and the new value.

2. Subtract the original value from the new value.

3. Divide the difference by the original value.

4. Multiply the result by 100.

Example

You had $50, and now you have $75.

• Step 1: 75 – 50 = 25

• Step 2: 25 ÷ 50 = 0.5

• Step 3: 0.5 × 100 = 50%

So, you have a 50% increase.

If you want help converting fractions to percentages, try our Fraction to Percent Calculator.

Everyday Examples of Percent Change

Percent change is part of daily life:

• Gas Prices: If gas cost $30 last year and now it costs $33, that’s a 10% increase.

• Shopping Discounts: A shirt marked down 15% from $20 now costs $17.

• Investments: If stock values drop 15%, investors can measure their losses.

• Business Growth: A restaurant with a new menu sees a 20% increase in sales.

• Budgeting: Switching to a cheaper phone plan may save 5% monthly.

• Education: A student improves test scores by 10% after getting help.

You can also use our Percentage Decrease Calculator to check when values drop.

Percentage Conversion Table

Here’s a handy reference to convert percentages into decimals and fractions:

Where Percent Change Is Used

Business and Finance

Companies use percent change to compare revenue, costs, and profits. It helps them see progress or spot problems early. Investors use it to measure gains or losses on stocks or bonds. It’s also useful for planning budgets and managing risks.

Economics

Percent change is important in economics. It measures inflation, price shifts, or market demand. If apple prices rise 5% in a year, economists see that as a trend. Policymakers then make decisions based on these numbers.

Data Analysis

In data analysis, percent change helps track growth or decline. Businesses compare last year’s sales to this year’s. Scientists study how a condition has changed year over year. The formula helps them understand trends better.

FAQs

1. How do I calculate percent error?
Compare the expected value with the actual result. Subtract, divide by the expected value, and multiply by 100 to get the percent error.

2. What does “delta” mean in percentages?
In math, “delta” means change. So a delta in percentage shows how much something changed.

3. Why use percentages for basal metabolic rate (BMR)?
Some BMR calculators express your base calorie needs as a percent when comparing it with activity levels.

4. How do I convert fractions to percentages?
Divide the numerator by the denominator to get a decimal. Then multiply by 100 to get the percentage.

Related Calculators:

• Percentage Increase Calculator
• Sales Tax Calculator
• Discount Calculator