Percentage Calculator
Calculate what a percentage of a number is, instantly and accurately.
How to calculate a percentage
To calculate a percentage of a number, divide the percentage by 100 and multiply by the number.
Percentage value = (Percentage ÷ 100) × Number
Example: 25% of 200 = (25 ÷ 100) × 200 = 50.
About the Percentage Calculator
Percentages describe a part of a whole in units of one hundred, and this is the most basic percentage question there is: what is X% of Y? This general-purpose calculator answers that instantly for tips, discounts, statistics, grading, or any situation where you need a percentage of a number.
How It Works
The calculator converts your percentage to a decimal by dividing by 100, then multiplies that decimal by the value you provided to find the result.
Result = (Percent / 100) × Value.
Common percentage calculations
| Question | Formula | Example |
|---|---|---|
| What is X% of Y? | (X ÷ 100) × Y | 20% of 150 = 30 |
| X is what percent of Y? | (X ÷ Y) × 100 | 30 of 150 = 20% |
| X is Y% of what number? | X ÷ (Y ÷ 100) | 30 is 20% of 150 |
For reverse percentage questions, use the What Percentage Is X of Y Calculator or Reverse Percentage Calculator.
Worked example
Scenario: Finding 25% of 200 — for example, a 25% deposit on a $200 order.
- Convert the percentage to a decimal: 25 ÷ 100 = 0.25.
- Multiply by the number: 0.25 × 200 = 50.
- The calculator also shows 200 + 25% = 250 and 200 − 25% = 150.
Result: 25% of 200 is 50.
When this calculation is useful
Use this calculator for quick percentage-of-a-value questions such as tips, commissions, allocations, grades, tax estimates, and proportions. If your question starts with “what is X% of Y?”, this is the direct calculation to use.
Tips and common mistakes
- X% of Y always equals Y% of X — 8% of 50 is the same as 50% of 8, which is easier to do in your head (4).
- For mental math, find 10% by moving the decimal one place, then scale: 25% is 10% + 10% + 5%.
- To find what percentage one number is of another, use What Percentage Is X of Y.
- For a price after a markup or discount, the + and − results already give the new total.
Assumptions & Limitations
- Assumes the percentage and value are both entered as plain numbers, with the percent sign implied.
- Works identically regardless of whether the percentage is above or below 100%.
- This is a direct multiplication tool — for reverse questions like 'what percent is X of Y', use the dedicated calculator for that instead.