About Percentage Calculator
Calculate percentages six ways: X% of Y, percentage change, increase, decrease, and more. Free, no sign-up required.
How to use
- Open Percentage Calculator in your browser. There is no sign-up, no installation, and no payment required to use the tool.
- Enter your inputs in the form fields above. The tool runs entirely in your browser — your data never leaves your device, so it is safe to use with sensitive information.
- Review the output. Most ToolFluency tools update results live as you type; some require a click to recalculate. Look for any warnings or footnotes that explain edge cases or assumptions.
- Export, copy, or save the result. Many tools support PDF download, CSV export, or copy-to-clipboard. Bookmark the page if you expect to use it regularly — it loads instantly on return visits.
Frequently asked questions
How do I calculate what percentage one number is of another?
Divide the part by the whole, then multiply by 100. For example, to find what percentage 25 is of 200: (25 / 200) x 100 = 12.5%. The Percentage Calculator provides six different calculation modes so you can solve any percentage problem without remembering formulas.
How do I calculate percentage increase or decrease?
Subtract the old value from the new value, divide by the old value, and multiply by 100. If a price went from $80 to $100: ((100 - 80) / 80) x 100 = 25% increase. A negative result means a decrease. This is commonly used for tracking price changes, growth rates, and performance metrics.
What is the difference between percentage change and percentage points?
Percentage change is relative — going from 10% to 15% is a 50% increase. Percentage points measure the absolute difference — going from 10% to 15% is a 5 percentage point increase. This distinction matters in finance, statistics, and news reporting where the two are often confused.
Part of ToolFluency’s library of free online tools for Calculators. No account needed, no data leaves your device.