How to calculate percentage increase?

To calculate percentage increase: First, subtract the original value from the new value. Then, divide the result by the original value. Finally, multiply by 100. Formula: ((New - Old) / Old) * 100.

Multiply number Y by the percentage X, then divide by 100. For example, 20% of 50 is (50 * 20) / 100 = 10.

How to calculate percentage decrease?

To calculate percentage decrease: Subtract the new value from the original value to find the difference. Divide the difference by the original value, then multiply by 100.

What is the reverse percentage formula?

To find the original value before a percentage increase, divide the final value by (1 + percentage/100). To find it before a decrease, divide by (1 - percentage/100).

Is this percentage calculator free?

Yes, this tool is completely free and runs in your browser for privacy.

Percentage Calculator

Perform any percentage calculation instantly: increase, decrease, percentage of a number, and more. Includes step-by-step formulas.

🔢 Calculate X% of Y

What is % of ?

🎯 X is What % of Y?

is what % of ?

20%

📈 Percentage Increase

From to

50%

📉 Percentage Decrease

From to

25%

➕ Add Percentage

+ (increase by) %

115

➖ Subtract Percentage

- (decrease by) %

Tool Features

Multiple Modes: Increase, decrease, X of Y, Y in X.
Step-by-Step: Shows the exact formula used for every calculation.
Financial Ready: Perfect for discounts, taxes, tips, and interest.
Reverse Logic: Calculate value before a percentage change.
Privacy: No server uploads. instant local processing.

Understanding Percentages

A percentage is simply a ratio expressed as a fraction of 100. It is a universal way to compare quantities.

Basic Formula: (Part / Whole) × 100 = Percentage

Example: If you have 2 apples out of 10 fruits, that is (2/10)*100 = 20%.

Related Calculators

Frequently Asked Questions

How do I calculate a percentage of a number? +

To calculate X% of Y, multiply Y by X and divide by 100. For example, to find 20% of 150: 150 × 20 ÷ 100 = 30.

How do I calculate percentage increase between two numbers? +

Use the formula: ((New Value - Original Value) ÷ Original Value) × 100. For example, if a price increases from $50 to $65: ((65 - 50) ÷ 50) × 100 = 30%.

What is the difference between percentage change and percentage points? +

Percentage points measure the absolute difference between two percentages, while percentage change measures the relative change. For example, moving from 5% to 7% is a 2 percentage point increase, but a 40% percentage increase.

How do I calculate the original price before a discount? +

To find the original price before a X% discount, divide the sale price by (1 - X/100). For example, if an item costs $80 after a 20% discount: $80 ÷ (1 - 0.20) = $100.

How do I convert a fraction to a percentage? +

Divide the numerator by the denominator and multiply by 100. For example, 3/4 = 0.75 × 100 = 75%.