How do I calculate percentage of a number?

To find X% of Y, multiply Y by X and divide by 100. Formula: (X × Y) / 100. For example, 20% of 150 = (20 × 150) / 100 = 30.

How do I calculate percentage increase?

Percentage increase = ((New Value - Old Value) / Old Value) × 100. For example, from 80 to 100: ((100-80)/80) × 100 = 25% increase.

How do I find what percent one number is of another?

To find what percent X is of Y, divide X by Y and multiply by 100. Formula: (X / Y) × 100. For example, 30 is what percent of 150? (30/150) × 100 = 20%.

What is the formula for percentage decrease?

Percentage decrease = ((Old Value - New Value) / Old Value) × 100. For example, from 100 to 80: ((100-80)/100) × 100 = 20% decrease.

How do I convert a decimal to a percentage?

Multiply the decimal by 100 and add the % symbol. For example, 0.25 = 0.25 × 100 = 25%. To convert back, divide by 100: 25% = 25/100 = 0.25.

Percentage Calculator 2026 | Calculate %, Increase, Decrease

What is Percentage?

Percentage (%) is a way of expressing a number as a fraction of 100. The word comes from Latin "per centum" meaning "by the hundred." Percentages are used everywhere: discounts, interest rates, statistics, grades, tax rates, and more.

Understanding percentages is essential for financial literacy, comparing values, analyzing data, and making informed decisions in daily life.

Percentage Formulas

1. Finding X% of Y:
Result = (X × Y) / 100

2. What percent is X of Y:
Percentage = (X / Y) × 100

3. Percentage Increase:
% Increase = ((New - Old) / Old) × 100

4. Percentage Decrease:
% Decrease = ((Old - New) / Old) × 100

5. New Value after X% Increase:
New Value = Original × (1 + X/100)

6. New Value after X% Decrease:
New Value = Original × (1 - X/100)

How to Use This Calculator

This calculator has four modes to solve different percentage problems:

X% of Y: Find what amount is a given percentage of a number (e.g., "What is 20% of 500?")
X is what % of Y: Find what percentage one number is of another (e.g., "30 is what percent of 150?")
% Change: Calculate the percentage increase or decrease between two values (e.g., "From 80 to 100")
Increase/Decrease: Calculate the result after applying a percentage change (e.g., "200 increased by 15%")

Common Percentage Calculations

Discounts: A 30% discount on ₹1,000 = ₹1,000 × 0.30 = ₹300 off, final price ₹700
Tips: 15% tip on ₹800 bill = ₹800 × 0.15 = ₹120
Tax: 18% GST on ₹5,000 = ₹5,000 × 0.18 = ₹900 tax
Grades: 45 out of 60 = (45/60) × 100 = 75%
Growth: Revenue from ₹10L to ₹12L = ((12-10)/10) × 100 = 20% growth

Benefits of This Calculator

Multiple modes: Solve any type of percentage problem with one tool.
Instant results: Calculations update in real-time as you type.
Simple interface: Clear, natural language format for inputs.
No app needed: Works in any browser on any device.
Always free: No registration or payment required.

Frequently Asked Questions

How do I calculate 15% of 200?

Multiply 200 by 15 and divide by 100: (200 × 15) / 100 = 30. Or multiply by 0.15: 200 × 0.15 = 30.

What's the difference between percentage and percentile?

Percentage is a fraction of 100. Percentile indicates a position in a distribution—the 90th percentile means you scored better than 90% of others.

Can a percentage be more than 100%?

Yes. 200% means twice the original amount. A 150% increase means the value more than doubled. Percentages over 100% are common in growth rates and comparisons.

How do I find the original price before a discount?

If you know the discounted price and discount percentage: Original = Discounted Price / (1 - Discount%/100). A ₹700 price after 30% off means original was ₹700 / 0.70 = ₹1,000.

How do percentage points differ from percent?

Percentage points measure absolute difference between percentages. If rates go from 5% to 8%, that's a 3 percentage point increase, but a 60% relative increase ((8-5)/5 × 100).

Why is 50% off twice not 100% off?

Each percentage is applied to the remaining amount. 50% off ₹100 = ₹50. Another 50% off ₹50 = ₹25. Total discount is 75%, not 100%. Percentages don't add when applied sequentially.