% Percentage Calculator
Supports calculating X% of Y, what percentage X is of Y, and percentage increase/decrease calculations
🔢 Calculation Modules
1️⃣ Calculate X% of Y
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2️⃣ Calculate what percentage X is of Y
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3️⃣ Calculate percentage change
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💡 Tip: All calculations are performed in real-time. Results appear immediately after entering values.
Supports decimals and negative numbers with sufficient precision.
📚 Reference Information
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💡 Percentage Calculation Formulas:
Formula 1: X% of Y = (X / 100) × Y
Formula 2: X / Y × 100 = Percentage
Formula 3: ((New Value - Original Value) / Original Value) × 100 = Change Rate
Scenario Instructions Example
Discount Calculation Calculate discounted price 20% off $100 = $80
Tip Calculation Calculate tip amount on bill 15% of $50 = $7.5
Score Percentage Calculate score rate 90/100 = 90%
Growth Rate Calculate growth/decline percentage From 100 to 150 = +50%
📝 Common Uses:
• Business discounts and promotions
• Tax and tip calculations
• Performance and grade analysis
• Stock and investment returns
• Data growth analysis
• Survey results interpretation
• Budget planning and expense tracking
🔍 Special Cases:
• If Y is 0, division returns "Invalid"
• Negative percentages indicate decline
• Results are automatically rounded to appropriate decimal places

💡 Percentage Calculation Formulas:
1) X% of Y = (X ÷ 100) × Y
2) X is what % of Y = (X ÷ Y) × 100
3) Percentage change = ((New Value - Original Value) ÷ Original Value) × 100
💡 About Percentage Calculator: Our percentage calculator helps you perform three types of percentage calculations: calculate X% of Y, find what percentage X is of Y, and calculate percentage increase/decrease. Perfect for discounts, tips, tax calculations, grade analysis, growth rates, and financial planning. Real-time calculation updates as you enter values.