Free Percentage Calculator
Percentage Calculator
Use our free online tool to calculate percentages of numbers or percentage increases & decreases instantly.
Percentage Calculator
converters.net
What is
percent of
?
—
Result
is what percent of
?
—
Result
What is the percentage increase/decrease from
to
?
—
Result
Enter numbers in the input boxes and your answer will be automatically calculated.
Percentage Calculator — Fast, Accurate & Free
Use this Percentage Calculator to compute percentages instantly — find x% of y, determine what percent one number is of another, or calculate percentage increase/decrease. The tool is designed for accuracy, accessibility, and mobile use — ideal for students or everyday use.
Key features
- Instant results: real-time calculations as you type.
- Three modes: percent of, what percent, and percentage change.
- Copy result: copy the result with one click.
- Privacy: No calculations are sent to our servers.
How to use the Percentage Calculator
1. Select a converter
Choose the sentence that fits your needs (for example: “What is (number) percent of (number)?”).
2. Enter your numbers
Type the values into the input boxes
3. Read or copy the answer
The Result box updates automatically. Click Copy to copy the value to your clipboard.
Examples (quick reference)
| Question | Inputs | Answer |
|---|---|---|
| What is 20% of 150? | 20, 150 | 30 |
| 50 is what percent of 200? | 50, 200 | 25% |
| Percentage change from 80 to 100 | 80 → 100 | +25% |
How the math works (concise)
- Percent of: (p / 100) × x
- What percent: (a / b) × 100
- Percentage change: ((new − original) / original) × 100
Use cases & benefits
- Shopping: calculate sale prices and discounts quickly.
- Finance: measure returns and percentage changes over time.
- Education: get help with your homework and projects.
- Statistics: calculate percentages for your documents and presentations.
Tips
- Enter decimal values (e.g., 12.5) for precise percentages.
- The tool handles negative numbers and zeros safely – you can use them in the calculator.
- To preserve formatting for spreadsheets, copy the result and paste directly into your sheet.
Frequently Asked Questions
Is this calculator free?
Yes — this percentage calculator is free to use directly on this page.
How precise are the results?
The tool rounds sensibly for the sake of readability; very large or very small values may use scientific-style formatting for clarity.
Does this work on mobile?
Yes — the percentage calculator works on desktop, tablet and mobile.
Get started
Try the calculator on this page — enter your numbers and view results instantly.
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