Percentage Calculator
🏠 Free ToolThree percentage modes in one tool: calculate X% of Y, find what percentage X is of Y, or compute the percentage change from X to Y. Includes quick reference tables and formula display.
How it Works
The percentage calculator offers three essential modes for everyday math. Select your mode, enter two values, and get the result instantly with the formula shown for clarity.
In “X% of Y” mode, enter any percentage and value to find the result. This is useful for calculating tips, discounts, taxes, or any proportion. A quick reference table shows common percentages of your chosen value.
In “X is what % of Y” mode, determine what fraction one number represents of another. This helps with grade calculations, budget analysis, or understanding proportions in data.
In ”% change from X to Y” mode, compute the relative increase or decrease between two values. This is essential for analyzing financial performance, price changes, population growth, and any trend data.
Frequently Asked Questions
How do I calculate X% of a number?
Multiply the number by X and divide by 100. For example, 25% of 200 = 200 × 25 / 100 = 50. The calculator does this instantly for any values.
How do I find what percentage one number is of another?
Divide the first number by the second and multiply by 100. For example, 50 is what % of 200? (50 ÷ 200) × 100 = 25%.
How is percentage change calculated?
Percentage change = ((New Value - Old Value) ÷ |Old Value|) × 100. A positive result indicates an increase, negative indicates a decrease. For example, from 80 to 100: ((100-80)/80) × 100 = 25% increase.
What is the difference between percentage and percentage points?
If a rate goes from 5% to 8%, it increased by 3 percentage points but by 60% in relative terms. This calculator computes relative percentage change.
Can I use negative numbers?
Yes, the calculator handles negative numbers correctly. For percentage change, the absolute value of the starting number is used as the denominator to give meaningful results.
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