What This Percentage Calculator Does
| Feature | Description |
|---|---|
| 5 Calculation Modes | All common percentage operations |
| % of a Number | Calculate percentage of any value |
| What Percent? | Find what percent one number is of another |
| % Change | Calculate increase/decrease percentage |
| Add % | Add percentage to a number (tax, tip) |
| Subtract % | Subtract percentage (discount, sale) |
| Formula Display | Shows the calculation formula |
| Quick Presets | Common examples with one click |
| Copy Result | Export calculation to clipboard |
Five Calculation Modes
| Mode | Formula | Example |
|---|---|---|
| % of a Number | (P ÷ 100) × N | 20% of 200 = 40 |
| What Percent? | (Part ÷ Whole) × 100 | 30 is 15% of 200 |
| % Change | ((New – Old) ÷ Old) × 100 | 100→120 = +20% |
| Add % | N × (1 + P/100) | 100 + 10% = 110 |
| Subtract % | N × (1 – P/100) | 100 – 10% = 90 |
How to Use
Mode 1: % of a Number
- Enter percentage (e.g., 20)
- Enter “of” number (e.g., 200)
- Result: 40
Mode 2: What Percent?
- Enter “is” number (e.g., 30)
- Enter “of” number (e.g., 200)
- Result: 15%
Mode 3: Percentage Change
- Enter original value (e.g., 100)
- Enter new value (e.g., 120)
- Result: +20%
Mode 4 & 5: Add/Subtract %
- Enter base value (e.g., 100)
- Enter percentage (e.g., 10)
- Result: 110 (add) or 90 (subtract)
Quick Presets
| Click | Calculates |
|---|---|
| 10% of 100 | 10 |
| 15% of 200 | 30 |
| 20% of 500 | 100 |
| 25 is what % of 100? | 25% |
| 50 is what % of 200? | 25% |
| 50 → 75 | +50% |
| 100 → 80 | -20% |
| 100 + 20% | 120 |
Real-World Examples
| Scenario | Calculation |
|---|---|