Basic Percentage Calculator - What is X% of Y?
Help
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.
Need more percentage tools?
- Part-to-Whole Percentage
Find what % one number is of another. - 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.