FreeKit is a collection of free online tools for developers, SEO professionals, designers, students, content creators, and everyday users.

Are all tools completely free?

Yes. Every tool on FreeKit is free to use without subscriptions or hidden charges.

Do I need to create an account?

No. You can use all tools instantly without creating an account.

No. Most tools process data locally in your browser, and we do not permanently store your inputs.

Can I use FreeKit on mobile devices?

Yes. Every tool is fully responsive and works on smartphones, tablets, laptops, and desktop computers.

How often are new tools added?

We regularly add new tools and improve existing ones based on user feedback and industry needs.

Which browsers are supported?

FreeKit supports all modern browsers, including Chrome, Edge, Firefox, Safari, and other Chromium-based browsers.

Can I share these tools with others?

Absolutely. You are welcome to share FreeKit with friends, colleagues, students, and your team.

What is percentage increase?

Percentage increase measures how much a value has grown relative to its original value, expressed as a percentage. For example, if a price goes from $100 to $120, the percentage increase is 20%. It tells you not just how much something changed, but how significant that change is compared to where it started.

What is the formula for percentage increase?

The formula is: Percentage Increase = ((New Value − Original Value) / Original Value) × 100. First, subtract the original value from the new value to find the absolute change. Then, divide that change by the original value and multiply by 100 to get the percentage. For example: ((120 − 100) / 100) × 100 = 20%.

What is the difference between percentage increase and percentage of a number?

Percentage of a number finds a portion of a value (e.g., 20% of 100 = 20). Percentage increase measures growth from one value to another (e.g., from 100 to 120 = 20% increase). The key difference is that percentage increase compares two related values and always references the original as the base, while 'percentage of' is simply a fraction of a single value. Use our Percentage Calculator for the latter.

How do I calculate a salary increase percentage?

Divide the raise amount by your current salary and multiply by 100. For example, if your salary goes from $50,000 to $55,000, the increase is $5,000. The percentage increase is (5,000 / 50,000) × 100 = 10%. This same method works for hourly wages, monthly rent, or any recurring amount.

How do I calculate stock price growth as a percentage?

Use the same percentage increase formula with the original purchase price and the current price. If you bought a stock at $50 and it is now $75, the growth is ((75 − 50) / 50) × 100 = 50%. This calculation works for individual stocks, index funds, crypto, or any investment. It gives you a clear picture of your total return regardless of the dollar amounts involved.

Can percentage increase be used to measure inflation?

Yes. Inflation is typically reported as a percentage increase in the Consumer Price Index (CPI) over a period. If the CPI goes from 250 to 260 in one year, the inflation rate is ((260 − 250) / 250) × 100 = 4%. Governments and economists use this exact formula to track how much the cost of goods and services has risen over time.

What is the difference between compound and simple percentage increase?

Simple percentage increase applies to a single period — one original value and one new value. Compound increase applies the percentage growth repeatedly over multiple periods, where each period's growth builds on the previous total. For example, a 10% simple increase on $100 is $110. But 10% compounded over two years gives $100 × 1.10 × 1.10 = $121. Our calculator handles simple (single-period) increases.

What does a negative percentage increase mean?

A negative percentage increase actually represents a decrease. If your original value is 200 and the new value is 150, the formula gives ((150 − 200) / 200) × 100 = −25%. This means the value dropped by 25%. In such cases, you would typically use a Percentage Decrease Calculator for clearer results.

What are some real-world uses for percentage increase calculations?

Percentage increase is used everywhere: tracking salary raises and promotions, measuring investment and portfolio growth, analyzing year-over-year revenue growth for businesses, monitoring population growth, comparing test score improvements, evaluating website traffic growth, calculating price hikes in retail, and assessing inflation rates. Anytime you need to express how much something has grown relative to its starting point, percentage increase is the right metric.

How accurate is this percentage increase calculator?

This calculator uses JavaScript's native floating-point arithmetic and provides results with up to 10 decimal places of precision. For everyday use cases — finance, salary calculations, business metrics — this level of precision is more than sufficient. The results are formatted for readability while preserving full accuracy, and all calculations happen instantly in your browser with no data sent to any server.

Percentage Increase Calculator

Calculate the percentage increase from an original value to a new value.

BeginnerCalculatorsFreev1.0.0Updated Jul 22, 2025

Percentage Increase Calculator

Enter two values to see the percentage growth — results update in real time

Original Value

New Value

Quick examples

Enter values to calculate

Type an original value and a new value above, or click a quick example to get started.

100% Private — Runs in Your Browser

All percentage increase calculations happen locally using JavaScript. Your numbers are never sent to any server, stored, or shared. Close the tab and your data is gone.

How to Use the Percentage Increase Calculator

Calculating percentage increase is straightforward with this tool. Follow these steps:

Enter the original value — Type the starting value (e.g., your old salary, the original price, or the initial measurement).
Enter the new value — Type the current or final value (e.g., your new salary, the new price, or the latest measurement).
View instant results — The percentage increase, absolute change, and multiplier are calculated in real time as you type.
Review the formula — The step-by-step breakdown shows exactly how the result was calculated.
Try quick examples — Click any example button (salary raise, stock growth, population growth) to see the calculator in action.

Features

Real-time calculation — results update instantly as you type, no submit button needed
Percentage increase with visual green arrow indicator for growth
Absolute change display showing the exact numerical difference
Multiplier display showing how many times larger the new value is
Full formula breakdown with step-by-step explanation
Handles both increases and decreases — detects direction automatically
Quick example buttons for salary raises, stock growth, and population growth
Zero-division protection with a clear warning message
Formatted numbers with thousands separators for readability
100% browser-based — no server calls, no data collection, fully private

The Percentage Increase Formula

Core Formula

% Increase = ((New − Original) / Original) × 100

Subtract the original from the new value, divide by the original, then multiply by 100. This gives you the percentage growth relative to where you started.

Absolute Change

Change = New Value − Original Value

The simple difference between the two numbers. While useful on its own, it does not convey relative significance — a $10 increase on $20 is very different from $10 on $1,000.

Growth Multiplier

Multiplier = New Value / Original Value

A multiplier of 1.0 means no change, 1.25 means 25% increase, 2.0 means 100% increase (doubling). This is useful for compounding calculations and financial modeling.

Practical Examples

Salary Raise

Your salary goes from $60,000 to $66,000. The increase is ((66,000 − 60,000) / 60,000) × 100 = 10% raise.

Stock Price Growth

A share bought at $45 is now $63.45. That is ((63.45 − 45) / 45) × 100 = 41% gain on your investment.

Revenue Growth

Monthly revenue grew from $12,500 to $15,000. That is ((15,000 − 12,500) / 12,500) × 100 = 20% growth.

Website Traffic

Daily visitors increased from 8,000 to 12,400. That is ((12,400 − 8,000) / 8,000) × 100 = 55% traffic increase.

Population Growth

A city's population grew from 500,000 to 575,000. That is ((575,000 − 500,000) / 500,000) × 100 = 15% population increase.

Price Hike

A product's price went from $24.99 to $29.99. That is ((29.99 − 24.99) / 24.99) × 100 ≈ 20% price increase.

Percentage Increase vs. Percentage Decrease

Percentage Increase

Used when the new value is higher than the original. A positive result indicates growth. This calculator handles this case and shows a green upward arrow indicator. Common in salary raises, investment returns, and revenue growth tracking.

Percentage Decrease

Used when the new value is lower than the original. A negative result indicates decline. Our calculator detects this automatically and shows a red indicator. For dedicated decrease calculations, try our Percentage Decrease Calculator.

Tips for Accurate Percentage Increase Calculations

Always use the original (starting) value as the denominator — this is the most common mistake in percentage calculations.
Remember that percentage increase and decrease are not symmetric: a 50% increase followed by a 50% decrease does not return to the original value.
For year-over-year comparisons, ensure both values cover the same time period to avoid misleading results.
When comparing multiple increases, look at the multiplier rather than just the percentage — a 200% increase means tripling (3.0× multiplier).
For compound growth over multiple periods, you cannot simply add the percentages — use compound interest formulas or financial calculators.
Need to calculate the reverse? Use our Percentage Calculator to find what a value was before a known percentage increase.
Planning a shopping trip? Our Discount Calculator helps you find the final price after percentage decreases.
Tracking health metrics alongside growth? Our BMI Calculator pairs well with percentage-based body measurement tracking.
A percentage increase greater than 100% simply means the new value is more than double the original — this is common in high-growth scenarios.
All calculations run in your browser using JavaScript. No data is ever sent to a server.

Frequently Asked Questions

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How to Use the Percentage Increase Calculator

Calculating percentage increase is straightforward with this tool. Follow these steps:

Enter the original value — Type the starting value (e.g., your old salary, the original price, or the initial measurement).

Enter the new value — Type the current or final value (e.g., your new salary, the new price, or the latest measurement).

View instant results — The percentage increase, absolute change, and multiplier are calculated in real time as you type.

Review the formula — The step-by-step breakdown shows exactly how the result was calculated.

Try quick examples — Click any example button (salary raise, stock growth, population growth) to see the calculator in action.

Features

Real-time calculation — results update instantly as you type, no submit button needed

Percentage increase with visual green arrow indicator for growth

Absolute change display showing the exact numerical difference

Multiplier display showing how many times larger the new value is

Full formula breakdown with step-by-step explanation

Handles both increases and decreases — detects direction automatically

Quick example buttons for salary raises, stock growth, and population growth

Zero-division protection with a clear warning message

Formatted numbers with thousands separators for readability

100% browser-based — no server calls, no data collection, fully private

The Percentage Increase Formula

Core Formula

% Increase = ((New − Original) / Original) × 100

Subtract the original from the new value, divide by the original, then multiply by 100. This gives you the percentage growth relative to where you started.

Absolute Change

Change = New Value − Original Value

The simple difference between the two numbers. While useful on its own, it does not convey relative significance — a $10 increase on $20 is very different from $10 on $1,000.

Growth Multiplier

Multiplier = New Value / Original Value

A multiplier of 1.0 means no change, 1.25 means 25% increase, 2.0 means 100% increase (doubling). This is useful for compounding calculations and financial modeling.

Practical Examples

Salary Raise

Your salary goes from $60,000 to $66,000. The increase is ((66,000 − 60,000) / 60,000) × 100 = 10% raise.

Stock Price Growth

A share bought at $45 is now $63.45. That is ((63.45 − 45) / 45) × 100 = 41% gain on your investment.

Revenue Growth

Monthly revenue grew from $12,500 to $15,000. That is ((15,000 − 12,500) / 12,500) × 100 = 20% growth.

Website Traffic

Daily visitors increased from 8,000 to 12,400. That is ((12,400 − 8,000) / 8,000) × 100 = 55% traffic increase.

Population Growth

A city's population grew from 500,000 to 575,000. That is ((575,000 − 500,000) / 500,000) × 100 = 15% population increase.

Price Hike

A product's price went from $24.99 to $29.99. That is ((29.99 − 24.99) / 24.99) × 100 ≈ 20% price increase.

Percentage Increase vs. Percentage Decrease

Percentage Increase

Percentage Decrease

Tips for Accurate Percentage Increase Calculations

Always use the original (starting) value as the denominator — this is the most common mistake in percentage calculations.

Remember that percentage increase and decrease are not symmetric: a 50% increase followed by a 50% decrease does not return to the original value.

For year-over-year comparisons, ensure both values cover the same time period to avoid misleading results.

When comparing multiple increases, look at the multiplier rather than just the percentage — a 200% increase means tripling (3.0× multiplier).

For compound growth over multiple periods, you cannot simply add the percentages — use compound interest formulas or financial calculators.

Need to calculate the reverse? Use our Percentage Calculator to find what a value was before a known percentage increase.

Planning a shopping trip? Our Discount Calculator helps you find the final price after percentage decreases.

Tracking health metrics alongside growth? Our BMI Calculator pairs well with percentage-based body measurement tracking.

A percentage increase greater than 100% simply means the new value is more than double the original — this is common in high-growth scenarios.

All calculations run in your browser using JavaScript. No data is ever sent to a server.

Frequently Asked Questions