Percentage Calculator Free
Calculate percentage values, percentage increases/decreases, and fractional proportions.
- 100% free
- Files stay on your device
- No sign-up, no watermark
What is X% of Y?
X is what percent of Y?
Percentage Increase or Decrease
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What is Percentage Calculator?
Solve common percentage math problems without confusion. Calculate what percent X is of Y, find percentage increases or decreases between two values, and compute sales tax and retail markups with step-by-step breakdowns.
How to use Percentage Calculator
- 1
Add your file or input
Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.
- 2
Adjust the options
Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.
- 3
Process and download
Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.
Frequently asked questions
How is percentage increase/decrease calculated?
The formula is: ((New Value - Old Value) / |Old Value|) * 100. A positive result indicates percentage growth, while a negative result represents a percentage decrease.
Can I calculate reverse percentages (e.g. finding original price before tax)?
Yes! You can calculate the original pre-discount or pre-tax price from the final amount and percentage rate.
Are calculation results rounded?
Results are calculated to full double-precision floating-point accuracy and displayed with up to 4 decimal places for accounting precision.
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