Percentage Calculator
Use this free percentage calculator to find a percentage of any number, determine what percent one value is of another, or calculate the percentage change between two values — instantly.
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Complete Guide to Percentage Calculations
Read our complete guide to percentage calculationsHow to Use
Tab 1 — % of Number: Enter the percentage and the number you want to find it of. For example, enter 20 and 150 to find 20% of 150 (= 30).
Tab 2 — X is % of Y: Enter X and Y to find out what percentage X represents of Y. For example, 30 is what percent of 150? Answer: 20%.
Tab 3 — % Change: Enter an old value and a new value to calculate the percentage increase or decrease. A positive result means an increase; negative means a decrease.
How It Works
Percentages are one of the most fundamental concepts in everyday mathematics. A percentage simply means "per hundred" — it expresses a number as a fraction of 100. The word comes from the Latin per centum, meaning "by the hundred."
Finding a percentage of a number: Multiply the number by the percentage and divide by 100. Formula: Result = (Percentage × Number) / 100. Example: 15% of 80 = (15 × 80) / 100 = 12.
X is what percent of Y: Divide X by Y, then multiply by 100. Formula: Percentage = (X / Y) × 100. Example: 25 is what percent of 200? = (25 / 200) × 100 = 12.5%.
Percentage change: Measures how much a value has increased or decreased relative to its original value. Formula: ((New − Old) / Old) × 100. Example: A price rose from $50 to $65 → ((65 − 50) / 50) × 100 = 30% increase.
