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Percentage Calculator: Quickly Find X% of Any Number (and More)
The Percentage Calculator helps you compute a percentage of a number in seconds—perfect for discounts, tips, interest, and data analysis. Enter a base number and choose a percentage to instantly see the result.
1) What the Calculator Does
This tool calculates the value of a selected percentage of a given number. For example, 20% of 200 equals 40. It’s useful for quick price checks, budgeting, interest estimates, and any situation where you need a proportion of a total.
2) Inputs
| Input | Description |
|---|---|
| Number | The base amount you’re taking a percentage of (e.g., bill total, loan balance, sample size). |
| Percentage | The share of the base number expressed as a percent (0–100). Example: 15% means 15 per hundred. |
3) How It Works (Formula or Calculation Logic)
The calculator converts the percent to a decimal and multiplies it by the base number.
result = base × (percent ÷ 100)
base= the number you’re taking a percentage ofpercent= the chosen percent (e.g., 20 for 20%)result= the percentage value of the base
Example: 20% of 200 → 200 × (20 ÷ 100) = 40.
4) Outputs
| Output | What It Means |
|---|---|
| Calculated Percentage | The numeric value equal to the chosen percent of the base number. |
5) Practical Use Cases
- Shopping & Discounts: See final prices after sales (e.g., 30% off).
- Dining & Tips: Compute 15–20% gratuity quickly.
- Loans & Interest: Estimate simple interest portions of balances.
- Data & Surveys: Translate counts to percentages of a total.
- Health & Fitness: Work out macronutrient % of daily calories.
- Budgeting: Allocate a % of income to savings or expenses.
6) FAQ
How do I calculate X% of Y?
Multiply the base by the percent as a decimal. Example: 18% of 250 → 250 × 0.18 = 45.
How do I find what percent one number is of another?
Use percent = (part ÷ whole) × 100. Example: 30 is what percent of 120? (30 ÷ 120) × 100 = 25%.
What’s the difference between percentage and percentage points?
Percent is a relative change (e.g., price rises 10%). Percentage points measure the difference between two percentages (e.g., 12% to 15% is a 3 percentage-point increase, not 3%).
How do I increase or decrease a number by a percentage?
Increase: new = base × (1 + percent ÷ 100). Decrease: new = base × (1 − percent ÷ 100).
Common mistakes to avoid
- Forgetting to divide the percent by 100 before multiplying.
- Confusing percentage change with percentage points.
- Applying the percent to the wrong base number.
