Percentage 電卓
計算する percentages, 見つける what percent one number is of another, or determine the whole from a percentage.
Calculate Percentages
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A percentage is a way of expressing a number as a fraction of 100. Percentages are used everywhere — from calculating discounts and tips to determining grades and interest rates.
The Three Basic Percentage Problems
1. Finding a percentage of a number
Example: "What is 25% of 200?"
(25 ÷ 100) × 200 = 50
2. Finding what percentage one number is of another
Example: "50 is what percent of 200?"
(50 ÷ 200) × 100 = 25%
3. Finding the whole from a part and percentage
Example: "50 is 25% of what?"
50 ÷ (25 ÷ 100) = 200
Frequently Asked Questions
How do I calculate a percentage of a number?
To find X% of Y, divide X by 100 and multiply by Y. For example, 25% of 200 = (25 ÷ 100) × 200 = 50.
How do I calculate percentage increase or decrease?
Percentage change = ((New Value - Old Value) ÷ Old Value) × 100. A positive result indicates an increase; negative indicates a decrease.