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Free Online Percentage Calculator
Calculate percentages, percent change, discount sales, fractions, and percentage differences with step-by-step mathematical formula breakdowns.
1. What is X% of Y?
(15 ÷ 100) × 240 = 36
2. X is what % of Y?
(45 ÷ 180) × 100 = 25%
3. Percentage Increase / Decrease
((75 - 50) ÷ 50) × 100 = +50%
4. Sale Discount Calculator
You save: $30 (25% off)
How It Works
Simple, fast, and 100% secure in 3 steps.
Select Calculation Mode
Choose whether you need a basic percentage of a number, percentage change, or discount.
Enter Numbers
Type any positive or decimal numbers into the input boxes.
View Step-by-Step Formula
Instantly see the exact answer and the mathematical equation explaining how it was solved.
Key Features & Capabilities
Designed for accuracy, privacy, and maximum efficiency.
Instant Reactive Calculation
Results update in real-time as you type with zero page reload delays.
Formulas & Educational Explanations
Provides exact algebraic steps to help students and professionals understand the math.
Discount & Grocery Savings
Calculate final checkout prices after coupons, sales tags, and markdowns.
Frequently Asked Questions
Everything you need to know about using this tool.
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