Percentage Calculator
Calculate percentages easily with multiple calculation modes
What is X% of Y?
Find a percentage of a number (e.g., discounts, tips)
X is what percent of Y?
Find what percentage one number is of another (e.g., test scores)
Percentage Change
Calculate percentage increase or decrease between two values
Percentage Difference
Find the percentage difference between two numbers
% of =
is of
%
From to
%
Difference between and
%
Calculation Details
Quick Reference
Common Percentages
10% = 1/10 = 0.1
25% = 1/4 = 0.25
50% = 1/2 = 0.5
75% = 3/4 = 0.75
Converting Percentages
% to Decimal: ÷ 100
Decimal to %: × 100
% to Fraction: /100
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About Percentage Calculator
What is a Percentage Calculator?
A percentage calculator is a versatile mathematical tool that helps you perform various percentage-related calculations quickly and accurately. Whether you're calculating discounts, tips, grade percentages, tax amounts, or growth rates, this calculator handles all common percentage operations.
How to Use This Calculator
- Select calculation mode: Choose from four different percentage calculations
- Enter your values: Input the numbers based on your selected mode
- View instant results: Get accurate results calculated in real-time
- Try different calculations: Switch modes to perform various percentage operations
Calculation Modes Explained
Mode 1: What is X% of Y?
Finds a percentage of a given number.
- Formula: Result = (Percentage / 100) × Number
- Example: What is 25% of 200? Answer: 50
- Use cases: Calculating tips, discounts, tax amounts
Mode 2: X is What Percent of Y?
Determines what percentage one number is of another.
- Formula: Percentage = (Part / Whole) × 100
- Example: 50 is what percent of 200? Answer: 25%
- Use cases: Test scores, completion rates, market share
Mode 3: Percentage Change
Calculates the percentage increase or decrease between two numbers.
- Formula: Change = ((New - Old) / Old) × 100
- Example: From 100 to 150? Answer: 50% increase
- Use cases: Price changes, growth rates, performance metrics
Mode 4: Percentage Difference
Finds the percentage difference between two numbers.
- Formula: Difference = (|A - B| / ((A + B) / 2)) × 100
- Example: Difference between 100 and 80? Answer: 22.22%
- Use cases: Comparing values, variance analysis
Frequently Asked Questions
How do I calculate a percentage manually?
To find X% of Y: multiply Y by X, then divide by 100. For example, 20% of 150 = (150 × 20) / 100 = 30.
What's the difference between percentage change and percentage difference?
Percentage change measures how much a value has changed relative to its original value (directional). Percentage difference measures the difference between two values relative to their average (non-directional).
How do I calculate percentage increase?
Percentage increase = ((New Value - Original Value) / Original Value) × 100. If the result is negative, it's a decrease.
Can I use this for calculating grades?
Yes! Use Mode 2 to calculate your score percentage. Enter your points earned as the first number and total possible points as the second.
How accurate is this calculator?
This calculator provides results accurate to multiple decimal places and uses standard mathematical formulas used worldwide.
Tip: For financial calculations like tips or discounts, Mode 1 (X% of Y) is typically what you need. For comparing before/after values, use Mode 3 (Percentage Change).