Part-to-Whole Percentage Calculator - Find What Percent X is of Y
Help
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.
Need more percentage tools?
- Basic Percentage Calculator
For discounts or taxes. - Original Value Calculator
Reverse a percentage to the original amount. - Percentage Change Calculator
Work out increases or decreases. - Increased Value Calculator
Calculate value after percentage increase. - Decreased Value Calculator
Calculate value after percentage decrease. - Original Before Increase Calculator
Find original amount before percentage increase. - Original Before Decrease Calculator
Find original amount before percentage decrease. - Specialized Calculators (63+)
Practical everyday calculations for real-life scenarios.
Requirements and Important Information
- No installation required – works directly in your browser.
- Compatible with all modern browsers (Chrome, Firefox, Safari, Edge).
- Calculations are performed locally – no data is sent to any server.
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Your calculation memos is stored only on your device.
Each calculator stores up to 20 most recent calculations, automatically removing the oldest entries when this limit is reached. - Works offline after the initial page load.
- Supports both desktop and mobile devices.
- No account or login required.
Helpful Calculator Features
- Real-time calculations that update as you type.
- Copy results to clipboard with a single click.
- Calculation memos that persists between sessions.
- Option to round results for cleaner numbers.
- Clear visual formulas to understand the math.
- Mobile-friendly interface that works on all devices.
- Dark mode support for comfortable viewing.
- Keyboard shortcuts for faster calculations.
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.