Percentage Calculators - Help & Documentation
Learn how to use our percentage calculator tools efficiently with this comprehensive guide
Requirements and Important Information
- JavaScript Support
The Handy Percent application requires that JavaScript support is enabled in your web browser. Ensure JavaScript is active to use all functionalities smoothly.
- Decimal Separators
You may use the decimal separator suitable for your locale. For example:
- In the United States and United Kingdom, use a dot (.), e.g., 10.5.
- In many European countries, use a comma (,), e.g., 10,5.
- Thousands Separator
The thousands separator is ignored by the application when you type. You don't need to include it in your input. For instance, pasting 1,000 or 1.000 from the clipboard (depending on your locale settings) is treated simply as 1000.
- Instant Calculations
All calculations are performed instantly, in real-time, as you type your values. There's no need to press any button to see the results.
Helpful Calculator Features
Our calculators include several features to make your calculations faster and easier:
Easy Clipboard Integration
- Quickly paste numbers from your clipboard with the automatic Paste button (Chrome only)
- Instantly copy your results by clicking Add to Memos (copies to clipboard and saves to memos)
- Results are copied as plain numbers without additional text
Keyboard Shortcuts
- Press Enter to move to the next field, copy the result to the clipboard, and save to memos
- Press Escape to clear all fields and start fresh
- Use Space to move between input fields quickly
Calculation Memos
- Calculations are automatically saved to your memos
- Click on any previous calculation to reload those values
- Easily delete single items or clear the entire memos
- Memos is stored locally in your browser for future use
- Each calculator stores up to 20 most recent calculations, automatically removing the oldest entries when this limit is reached
Customize Your Calculator
- Drag and drop calculators to prioritize your most frequently used tools
- Press and hold the mouse button on the calculator's icon, drag the calculator to your preferred position, then release the button
- Your customized order is saved automatically
Mobile-Friendly Design
- Our calculators are fully responsive and work seamlessly on any device
- A mobile-friendly menu allows easy navigation between pages (Calculators, Help, and Privacy Policy)
- Designed with touch-friendly buttons and inputs suitable for all screen sizes
Additional Features
- Quickly toggle between light and dark modes
- Visual mathematical formulas provided for clarity
- Input validation ensures accurate and reliable results
Basic Percentage CALCULATOR
Calculate the percentage value of a given number quickly and easily.
Practical Uses
- Sale Discount: 20% [X] off an $80 [Y] product, how much do you save? $16 [Z]
- Tax Calculation: 8% [X] tax on a $250 [Y] item, how much is it? $20 [Z]
- Grade Points: If you scored 85% [X] of 120 [Y] total points, how many points did you earn? 102 [Z] points
- Daily Nutritional Value: 40% [X] of a 2,000 [Y] calorie diet, how many calories is that? 800 [Z] calories
- Restaurant Tip: A 15% [X] tip on a $60 [Y] bill, how much is it? $9 [Z]
- Investment Interest: 5% [X] annual interest on a $1,000 [Y] investment, how much does it earn? $50 [Z]
How to Use
- Enter the percentage value in the first input.
- Enter the number you want to calculate the percentage of in the second input.
- The result updates instantly; optionally enable "Round" for 2-decimal precision.
- Click "Add to Memos" or press Enter to save the calculation.
How It Works
The Basic Percentage calculator uses this formula:
Example: What is 20% of 80?
So 20% of 80 is 16.
Original Value CALCULATOR
The Original Value calculator (also known as reverse percentage calculator) helps you find the original value when you know a percentage and its result. This is useful for working backward from a known percentage to find the original amount.
Practical Uses
- Pre-Discount Price: If 25% [X] of the original price equals $50 [Z] discount, what was the original price? $200 [Y]
- Pre-Tax Amount: If 8% [X] tax equals $16 [Z], what was the pre-tax amount? $200 [Y]
- Original Value: If 15% [X] of a value equals 30 [Z], what is the original value? 200 [Y]
- Pre-Raise Salary: If a 10% [X] raise equals $5,000 [Z], what was the original salary? $50,000 [Y]
- Investment Principal: If a 12% [X] return equals $2,400 [Z], what was the original investment? $20,000 [Y]
- Total Budget: If 30% [X] of a budget equals $600 [Z], what is the total budget? $2,000 [Y]
How to Use
- Enter the percentage value in the first input.
- Enter the result amount that equals that percentage in the second input.
- The calculator instantly returns the original value; optional rounding is available.
- Click "Add to Memos" or press Enter to save the calculation.
How It Works
The Original Value calculator uses this formula:
Example: If 15% equals 30, the original value is:
So the original value is 200.
Part-to-Whole Percentage CALCULATOR
Find what percentage one number is of another quickly and accurately.
Practical Uses
- Test Score: If you scored 85 [Z] points out of 100 [Y] total, what is your grade? 85% [X%]
- Market Share: If your company's sales are $250,000 [Z] out of $1,000,000 [Y] total industry sales, what is your market share? 25% [X%]
- Budget Allocation: If you spend $800 [Z] on rent from a $4,000 [Y] monthly budget, what percentage is that? 20% [X%]
- Savings Progress: If you saved $7,500 [Z] toward a $10,000 [Y] goal, what percentage are you at? 75% [X%]
- Task Completion: Completing 18 [Z] tasks out of 24 [Y] total, what percentage completion is that? 75% [X%]
- Batting Average: If a player gets 30 [Z] hits in 100 [Y] at-bats, what is the batting average? 30% [X%]
How to Use
- Enter the total value (Y) in the first input field (after "of").
- Enter the partial value (Z) in the second input field (after "is").
- The calculator will instantly show what percentage of Y is Z.
- Optionally, check the "Round" box to round the result to two decimal places.
- Click "Add to Memos" or press Enter to save your calculation.
How It Works
The Part-to-Whole Percentage calculator uses this formula:
For example, to find what percentage 25 is of 100, the calculator computes:
So 25 is 25% of 100.
Percentage Change CALCULATOR
Calculate the percentage difference between two values to determine increases or decreases.
Practical Uses
- Stock Price Change: If a stock goes from $50 [Original] to $75 [New], what's the percentage change? 50% [Change%] increase
- Salary Change: A salary increase from $50,000 [Original] to $54,000 [New], what's the percentage raise? 8% [Change%]
- Weight Loss: Going from 180 [Original] lbs to 162 [New] lbs, what's the percentage change? 10% [Change%] decrease
- Revenue Growth: Revenue growing from $1,000,000 [Original] to $1,200,000 [New], what's the percentage growth? 20% [Change%]
- Performance Improvement: Improving a test score from 70 [Original] to 84 [New], what's the percentage improvement? 20% [Change%]
- Inflation Rate: A product price rising from $100 [Original] to $103 [New], what's the inflation rate? 3% [Change%]
- Traffic Change: Website visits declining from 10,000 [Original] to 8,500 [New], what's the percentage change? 15% [Change%] decrease
How to Use
- Enter the original (old) value in the first input field.
- Enter the new value in the second input field.
- Optionally, check the "Round" box to round the result to two decimal places.
- The calculator will instantly show the percentage change.
- A positive result indicates an increase; negative indicates a decrease.
- Click "Add to Memos" or press Enter to save your calculation.
How It Works
The Percentage Change calculator uses this formula:
For example, if a value increases from 50 to 75, the calculator computes:
This shows a 50% increase from the original value.
Increased Value CALCULATOR
Calculate the new value after increasing an original amount by a specific percentage.
Practical Uses
- Salary Increase: If your $50,000 [Original] salary increases by 8% [Increase], what is your new salary? $54,000 [New]
- Price Inflation: A $120 [Original] item with 5% [Increase] price increase, what does it become? $126 [New]
- Investment Growth: A $2,000 [Original] investment growing by 12% [Increase], what does it become? $2,240 [New]
- Population Growth: A city of 100,000 [Original] people with 3% [Increase] growth, what population does it reach? 103,000 [New]
- Rent Increase: Monthly rent of $1,200 [Original] with a 7% [Increase] increase, what does it become? $1,284 [New]
- Budget Allocation: A $5,000 [Original] marketing budget increased by 25% [Increase], what does it become? $6,250 [New]
How to Use
- Enter the original value into the first input field.
- Enter the percentage increase into the second input field.
- Optionally, check the "Round" box to round the result to two decimal places.
- The calculated new value is shown instantly as you type.
- Click "Add to Memos" or press Enter to save your calculation.
How It Works
The Increased Value calculator uses this formula:
For example, to find the new value when $1,000 is increased by 15%, the calculator computes:
So the new value is $1,150.
Original Before Increase CALCULATOR
Calculate the original value before a percentage increase, given the new value and percentage increase.
Practical Uses
- Reverse Salary Calculation: If a new salary is $54,000 [New] after an 8% [Increase] increase, what was the original salary? $50,000 [Original]
- Original Price Analysis: If an item costs $126 [New] after a 5% [Increase] price increase, what was the original price? $120 [Original]
- Investment Principal: If an investment is worth $2,240 [New] after 12% [Increase] growth, what was the original investment? $2,000 [Original]
- Pre-Growth Population: If a city has 103,000 [New] people after 3% [Increase] growth, what was the original population? 100,000 [Original]
- Original Rent: If rent is now $1,284 [New] after a 7% [Increase] increase, what was the original rent? $1,200 [Original]
- Base Budget: If a budget is $6,250 [New] after a 25% [Increase] increase, what was the original budget? $5,000 [Original]
How to Use
- Enter the percentage increase into the first input field.
- Enter the new value (after increase) into the second input field.
- Optionally, check the "Round" box to round the result to two decimal places.
- The calculated original value is shown instantly as you type.
- Click "Add to Memos" or press Enter to save your calculation.
How It Works
The Original Before Increase calculator uses this formula:
For example, to find the original value when the new value is $1,150 after a 15% increase, the calculator computes:
So the original value was $1,000.
Important Note
When the increase percentage is -100%, the calculation is undefined because you cannot divide by zero. The calculator will show an error message in this case.
Decreased Value CALCULATOR
Calculate the new value after decreasing an original amount by a specific percentage.
Practical Uses
- Sale Discount: A $300 [Original] jacket with a 30% [Decrease] discount, how much does it cost? $210 [New]
- Weight Loss: If you weigh 180 [Original] lbs and lose 15% [Decrease], what is your new weight? 153 [New] lbs
- Budget Cut: A $10,000 [Original] department budget cut by 25% [Decrease], what does it become? $7,500 [New]
- Stock Price Drop: A $45 [Original] stock declining by 12% [Decrease], what does it become? $39.60 [New]
- Energy Savings: A $200 [Original] monthly bill reduced by 18% [Decrease], what does it become? $164 [New]
- Employee Reduction: A 500 [Original]-person workforce reduced by 10% [Decrease], how many people remain? 450 [New] people
How to Use
- Enter the original value into the first input field.
- Enter the percentage decrease into the second input field.
- Optionally, check the "Round" box to round the result to two decimal places.
- The calculated new value is shown instantly as you type.
- Click "Add to Memos" or press Enter to save your calculation.
How It Works
The Decreased Value calculator uses this formula:
For example, to find the new value when $800 is decreased by 20%, the calculator computes:
So the new value is $640.
Original Before Decrease CALCULATOR
Calculate the original value before a percentage decrease, given the new value and percentage decrease.
Practical Uses
- Reverse Price Calculation: If an item costs $95 [New] after a 5% [Decrease] discount, what was the original price? $100 [Original]
- Original Salary Analysis: If a reduced salary is $46,000 [New] after a 8% [Decrease] cut, what was the original salary? $50,000 [Original]
- Investment Principal: If an investment is worth $1,760 [New] after a 12% [Decrease] loss, what was the original investment? $2,000 [Original]
- Pre-Decline Population: If a city has 97,000 [New] people after a 3% [Decrease] decline, what was the original population? 100,000 [Original]
- Original Expense: If expenses are now $930 [New] after a 7% [Decrease] reduction, what were the original expenses? $1,000 [Original]
- Base Budget: If a budget is $3,750 [New] after a 25% [Decrease] decrease, what was the original budget? $5,000 [Original]
How to Use
- Enter the percentage decrease into the first input field.
- Enter the new value (after decrease) into the second input field.
- Optionally, check the "Round" box to round the result to two decimal places.
- The calculated original value is shown instantly as you type.
- Click "Add to Memos" or press Enter to save your calculation.
How It Works
The Original Before Decrease calculator uses this formula:
For example, to find the original value when the new value is $950 after a 5% decrease, the calculator computes:
So the original value was $1,000.
Important Note
When the decrease percentage is 100%, the calculation is undefined because you cannot divide by zero. The calculator will show an error message in this case.
Tips for Accurate Calculations
- Double-check input numbers for accuracy.
- Use decimal points for precision.
- Calculations update instantly as you type.
- When the Round checkbox is checked, numbers are rounded to 2 decimal places.