Percentage Calculators
6 tools in this collection — free, instant, and private in your browser.
Percentage calculators handle one of the most common arithmetic tasks in everyday life: expressing a part of a whole as a fraction of 100. From calculating a tip at a restaurant to working out how much a stock has risen or a price has dropped, percentages appear constantly in personal finance, academics, shopping, and data analysis. These tools let you skip the mental arithmetic and get an accurate answer in seconds.
The core Percentage Calculator covers the three fundamental questions: what is X percent of Y, what percent is X of Y, and if X is N percent of some number, what is that number? Understanding which question you are actually asking is the key to choosing the right calculation, and the tool makes each case explicit.
Percentage Change and Percentage Increase/Decrease calculators address situations where you are comparing two values over time or across groups. Change can be positive or negative, and the sign matters: a 20 percent drop followed by a 20 percent rise does not return you to where you started. These tools make the directionality clear.
The Percentage of Total Calculator is especially useful in data work and budgeting, where you need to know what share each line item represents within a larger sum. For students, the GPA to Percentage converter translates letter-grade point averages into the percentage scale used in many countries outside North America.
For moving between decimals and percentages, the Decimal to Percent Calculator handles the conversion instantly and avoids the common mistake of misplacing a decimal point. If you are unsure which tool to start with, the plain Percentage Calculator covers most everyday cases, while the Change and Increase/Decrease tools are better when you are comparing two figures.
All percentage calculators
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| Tool | What it does |
|---|---|
| Decimal to Percent Calculator | Convert any decimal number to a percentage. |
| GPA to Percentage Calculator | Convert your GPA on a 4.0 scale to a percentage score. Useful for international university applications and transcripts. |
| Percentage Calculator | Calculate percentages instantly: what is X% of Y. Free percentage calculator, no signup. |
| Percentage Change Calculator | Calculate the percentage increase or decrease between two numbers. |
| Percentage Increase and Decrease Calculator | Calculate the percentage increase or decrease between two values, or find the new value after applying a percentage change. |
| Percentage of Total Calculator | Calculate what percentage one number is of another (part ÷ total × 100). |
Frequently asked questions
- What is the formula for percentage change?
- Percentage change equals the new value minus the old value, divided by the old value, multiplied by 100. A positive result means an increase; a negative result means a decrease. For example, going from 80 to 100 gives (100 - 80) / 80 * 100 = 25 percent increase.
- How is percentage of total different from percentage change?
- Percentage of total tells you what share one number is of a sum, for example 30 out of 120 is 25 percent of the total. Percentage change compares a single value at two points in time, for example that same value rising from 30 to 40 is a 33 percent increase. They answer different questions and should not be confused.
- How do I convert a GPA to a percentage?
- Divide your GPA by the maximum GPA of your scale (usually 4.0) and multiply by 100. The GPA to Percentage Calculator automates this and can handle both 4.0 and 10.0 scales. Different universities and countries use different scales, so always confirm which scale your institution uses before comparing figures.