CalculateY
Quick Answer
15% of 200 is 30. To calculate: multiply 200 by 15, then divide by 100. For the reverse, 30 is 15% of 200 because (30/200) × 100 = 15%.
What is X% of Y?
X is what % of Y?
Percentage Change
Original Value Before X% Change
Add or Subtract a Percentage
Common Examples
| Input | Result |
|---|---|
| What is 15% of 200? | 30 |
| What is 8.5% of 1,000? | 85 |
| 30 is what % of 200? | 15% |
| What is the % change from 75 to 90? | 20% increase |
How It Works
X% of Y = (X / 100) x Y
X is what % of Y = (X / Y) x 100
| Percentage Change = ((New - Old) / | Old | ) x 100 |
Original Value (before X% increase): Original = Final / (1 + X/100)
Original Value (before X% decrease): Original = Final / (1 - X/100)
Add a Percentage: Result = Value x (1 + Percent/100)
Subtract a Percentage: Result = Value x (1 - Percent/100)
Worked Example
To find 15% of 200: convert the percentage to a decimal (15/100 = 0.15), then multiply: 0.15 × 200 = 30. To find what percent 30 is of 200: divide 30 by 200 to get 0.15, then multiply by 100 to get 15%. For percentage change from 200 to 230: (230 - 200) / 200 × 100 = 15% increase.
Related Calculators
Percentage Change Calculator
Calculate percentage change, percentage of a number, and what percent one number is of another.
Discount Calculator
Calculate the sale price and savings from any discount percentage or fixed amount off.
ROI Calculator
Calculate return on investment (ROI) and annualized returns for any investment or project.