Percentage Calculator

Calculate percentages three ways: what is X% of Y, X is what % of Y, and percentage change from X to Y.
Calculation Mode
%

Result

30.00

15% of 200.00 is 30.00

Formula

15% x 200.00 = 30.00

Use the Percentage Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Our Percentage Calculator is your essential tool for understanding and applying percentages in everyday life and business, especially crucial for navigating the evolving economic landscape of 2026. Whether you're calculating a 3.5% inflation adjustment on your 2025 salary to find your 2026 wage, determining the market share increase from 15% to 18% for a new product, or figuring out a 12% sales tax on a $500 purchase, this calculator simplifies complex percentage problems. It empowers you to make informed financial decisions and analyze data with precision, keeping you ahead in a world where percentages drive everything from interest rates to economic growth forecasts.

This calculator employs three core percentage formulas. For 'What is X% of Y?', it calculates (X/100) * Y. For 'X is what % of Y?', it uses (X/Y) * 100. Finally, for 'Percentage change from X to Y?', the formula is ((Y - X) / X) * 100. These formulas are fundamental for converting fractions or ratios into a hundred-based scale, allowing for easy comparison and understanding of relative values or changes.

A common mistake is confusing 'percentage of' with 'percentage increase/decrease,' as the base value for calculation changes. Always double-check if your input values represent the original amount or the changed amount. Remember that a negative percentage change indicates a decrease, while a positive value signifies an increase. Ensure your inputs are numbers; text or symbols will lead to errors.

Example: Analyzing 2026 Q1 Revenue Growth

  1. 1 Step 1: A company's revenue in Q4 2025 was $1,250,000. In Q1 2026, it increased to $1,375,000. We want to find the percentage change.
  2. 2 Step 2: Using the 'Percentage change from X to Y' function, input X = 1,250,000 and Y = 1,375,000.
  3. 3 Step 3: The calculator output is a 10% increase.
  4. 4 Step 4: This indicates a robust 10% quarter-over-quarter revenue growth for the company, outperforming the projected 8% industry average for Q1 2026.

Source: Khan Academy · Last updated: April 2026

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, 35 out of 200 is (35/200) x 100 = 17.5%.
How do I calculate percentage change?
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, the increase is (100-80)/80 x 100 = 25%.
What is X percent of Y?
Multiply Y by X/100. For example, 15% of $200 is 200 x 0.15 = $30. A quick shortcut: X% of Y is the same as Y% of X (8% of 50 = 50% of 8 = 4).

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