Percentage Calculator
Percentage calculations come up everywhere, from calculating discounts while shopping to analyzing financial reports and grading student exams. This free percentage calculator covers the three most common scenarios in one convenient tool. Find out what a specific percentage of a number equals, determine what percentage one value represents of another, or compute the percentage change between an old and new value. Need to spell out the result in words for a check or legal document? Paste it into the Number to Words Converter. Simply enter your numbers, and the answer appears instantly. No formulas to remember and no spreadsheet to open. The calculator handles decimals with precision and displays results rounded to two decimal places for clarity. For date-based calculations like age, try the Age Calculator. Everything runs in your browser, so your data stays private. Copy the result with a single click. Ideal for students, shoppers, business professionals, and anyone who works with numbers regularly.
How to Use This Tool
- Pick a calculation type— choose between "X% of Y," "X is what % of Y," or "percentage change from X to Y."
- Enter your numbers — type the values into the input fields. Decimals are fully supported.
- Read the result — the answer appears instantly as you type, rounded to two decimal places.
- Copy the answer — click the copy button to paste it into a document, spreadsheet, or message.
Examples
What is 15% of 200?
Input: Percentage = 15, Number = 200
Result: 30
Useful for calculating a 15% tip on a $200 dinner bill.
25 is what percent of 200?
Input: Value = 25, Total = 200
Result: 12.5%
Helpful for figuring out what fraction of a budget has been spent.
Percentage change from 80 to 100
Input: Old Value = 80, New Value = 100
Result: 25% increase
Common in sales reports when comparing this quarter's revenue to last quarter's.
What This Tool Is Useful For
- Shopping discounts — quickly find the sale price when a store offers 20% or 30% off.
- Grade calculations — convert raw scores (e.g., 42 out of 50) into a percentage for report cards.
- Financial analysis — measure profit margins, expense ratios, or year-over-year revenue changes.
- Tip calculation — determine the right tip amount at a restaurant based on the bill total.
- Business reports — express growth, market share, or conversion rates as clear percentages for stakeholders.
Frequently Asked Questions
- How do I calculate percentage increase?
- Subtract the old value from the new value, divide the difference by the old value, then multiply by 100. For example, going from 80 to 100: (100 - 80) / 80 x 100 = 25% increase. Select the "percentage change" mode in this tool to do it automatically.
- What is the formula for percentage of a number?
- Multiply the number by the percentage and divide by 100. So 15% of 200 = 200 x 15 / 100 = 30. This calculator applies the formula instantly when you type your values.
- Can I use decimals in the inputs?
- Yes. You can enter values like 7.5% or 199.99 and the calculator will handle them with full precision, rounding the output to two decimal places.
- What is the difference between percentage change and percentage difference?
- Percentage change measures how much a value has grown or shrunk relative to its original amount. Percentage difference compares two values relative to their average. This tool calculates percentage change, which is what most business and financial contexts require.
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