📊 Percentage Calculator
Calculate percentages instantly — find what percent of X is Y, percentage increase or decrease, X% of a number, and more. Free online tool with step-by-step results.
Common Percentage Calculations
| Calculation | Formula | Example | Result |
|---|---|---|---|
| X% of Y | Y × X/100 | 20% of 250 | 50 |
| X is what % of Y | X/Y × 100 | 30 is what % of 200 | 15% |
| Percentage Increase | (New-Old)/Old × 100 | 80 → 100 | 25% |
| Percentage Decrease | (Old-New)/Old × 100 | 100 → 75 | 25% |
How to Calculate Percentages
Percentages are a way of expressing a number as a fraction of 100. The word "percent" comes from the Latin "per centum," meaning "by the hundred."
Basic Percentage Formula
Percentage = (Part / Whole) × 100
Finding X% of a Number
Multiply the number by X and divide by 100. For example, 25% of 80 = 80 × 25/100 = 20.
Frequently Asked Questions
To calculate a percentage, divide the part by the whole and multiply by 100. For example, 25 out of 200 = (25/200) x 100 = 12.5%.
Percentage increase = ((New Value - Old Value) / Old Value) x 100. For example, going from 80 to 100: ((100-80)/80) x 100 = 25% increase.
Multiply Y by X/100. For example, 15% of 200 = 200 x 0.15 = 30.
Percentage represents a fraction of 100 (e.g., 75% = 75/100). Percentile indicates a position in a ranked dataset (e.g., 90th percentile means scoring higher than 90% of people).