Free online percentage calculator supporting discount calculations, growth rate calculations, percentage conversions and more
Formula: Result = Base Number × Percentage ÷ 100
Example: 15% of 200 = 200 × 15 ÷ 100 = 30
Applications: Calculate discount amounts, tax amounts, commissions, etc.
Formula: Percentage Change = ((New Value - Original Value) ÷ Original Value) × 100%
Example: From 100 to 150, growth rate = (150 - 100) ÷ 100 × 100% = 50%
Applications: Calculate sales growth, salary increases, price changes, etc.
Formula: Percentage = Decimal × 100%
Example: 0.25 = 0.25 × 100% = 25%
Applications: Data format conversion, grade conversion, ratio expression, etc.
Instant results as you type, no need to click buttons
Supports basic percentage, increase/decrease, conversion and more
Shows detailed calculation formulas to help understand percentage principles
Saves last 10 calculation records for easy review and comparison
Quickly copy calculation results to improve work efficiency
Works on mobile phones, tablets, computers and other devices
Choose from three tabs: Basic Percentage, Increase/Decrease, or Conversion.
Within each tab, select the specific calculation scenario such as percentage of a number, growth rate, decimal to percentage, etc.
Enter the corresponding values in the input fields. The system will automatically calculate results in real-time.
View calculation results and detailed formulas. Click "Copy Result" to quickly copy. History is automatically saved.
Calculate discounted prices, understand savings and discount amounts
Calculate sales growth rates, performance increases, year-over-year data
Calculate salary increases, bonus percentages, tax amounts, etc.
Calculate grade percentages, accuracy rates, score rates, etc.
Calculate data proportions, market share, completion rates, etc.
Calculate profit margins, cost ratios, return on investment, etc.
A percentage is a way of expressing a proportion, indicating how many hundredths one number is of another. The percentage symbol is %. For example, 50% means half, 25% means one quarter. Percentages are widely used in daily life and work, such as discount calculations, grade statistics, financial analysis, etc.
1. Calculate percentage of a number: Result = Base Number × Percentage ÷ 100
2. Calculate what percentage one number is of another: Percentage = (Part Value ÷ Total Value) × 100%
3. Find base number from percentage: Base Number = Part Value ÷ (Percentage ÷ 100)
4. Calculate growth rate: Growth Rate = ((New Value - Original Value) ÷ Original Value) × 100%
5. Calculate discounted price: Discounted Price = Original Price × Discount Rate ÷ 10
Decimal to percentage: Decimal × 100%, e.g., 0.75 = 75%
Percentage to decimal: Percentage ÷ 100, e.g., 75% = 0.75
Fraction to percentage: (Numerator ÷ Denominator) × 100%, e.g., 3/4 = 75%
Percentage to fraction: Write percentage as fraction with denominator 100, then simplify, e.g., 75% = 75/100 = 3/4
Mistake 1: Confusing "percentage of" and "percentage more than". For example, "A is 20% more than B" does not equal "B is 20% less than A".
Mistake 2: Consecutive percentages cannot be simply added. For example, increasing 10% then decreasing 10% does not return to the original price.
Mistake 3: Difference between percentage growth and absolute value growth. For example, growing from 1 to 2 is a 100% increase, but only increased by 1.