Percentage Calculator

**Percentage Calculator — Solve Any Percentage Problem Instantly**

Percentages are everywhere — discounts, interest rates, tax calculations, statistics, grade scores, and performance metrics. Yet many people still struggle with percentage calculations. Our Percentage Calculator handles all three common percentage problems with a single tool.

**Three Calculation Modes**

**Mode 1: What is X% of Y?**
Formula: Result = (X / 100) × Y
Example: What is 15% of 800? → (15/100) × 800 = 120

**Mode 2: X is what percent of Y?**
Formula: Percentage = (X / Y) × 100
Example: 45 is what percent of 180? → (45/180) × 100 = 25%

**Mode 3: Percentage Change (increase or decrease)**
Formula: Change = ((New Value – Old Value) / Old Value) × 100
Example: Price changed from 500 to 650 → ((650–500)/500) × 100 = +30% increase

**Real-World Use Cases**

*Shopping* — Calculate discount savings: a 30% discount on ₹2,500 saves you ₹750.

*Finance* — Calculate interest earned: 8% on ₹50,000 = ₹4,000/year.

*Academic* — Convert raw scores to percentages: 72 out of 90 = 80%.

*Business* — Track growth: revenue increased from ₹10L to ₹13L = 30% growth.

*Health* — BMI percentile, caloric deficit percentage, weight loss percentage.

*Tax* — Calculate 18% GST on ₹5,000 = ₹900.

**Common Percentage Mistakes**

1. **Percentage of vs. percentage change** — 20% of 100 = 20, but a 20% increase from 100 = 120.
2. **Adding percentages** — You cannot add percentages of different bases. 10% of 100 + 10% of 200 ≠ 20% of 300.
3. **Reversibility** — A 50% increase followed by a 50% decrease does NOT return to the original value. 100 × 1.5 × 0.5 = 75, not 100.

**Percentage Tips and Tricks**

- To calculate 10% of any number, simply move the decimal point one place left.
- To calculate 1%, move the decimal point two places left.
- To calculate 25%, divide by 4.
- To calculate 33.33%, divide by 3.