๐ Percentage Calculator
Calculate Percentage of Value
๐ Quick Examples
Shopping Discount
Original price: $80
Discount: 25%
You save: $20
Final price: $60
Grade Calculation
Score: 85/100
Percentage: 85%
Grade: B
Salary Increase
Old: $50,000
New: $55,000
Increase: 10%
Restaurant Tip
Bill: $120
Tip: 20%
Total: $144
Split 4 ways: $36 each
โ Frequently Asked Questions
What is a percentage?
A percentage is a way to express a number as a fraction of 100. The symbol % means "per hundred". For example, 25% means 25 out of 100, or 25/100 = 0.25.
How do I calculate percentage of a value?
To find X% of Y, use the formula: (X รท 100) ร Y
Example: 20% of 150 = (20 รท 100) ร 150 = 0.20 ร 150 = 30
How do I calculate percentage change?
Percentage change = ((New Value - Old Value) รท Old Value) ร 100
Example: From 50 to 75: ((75 - 50) รท 50) ร 100 = 50% increase
What's the difference between percentage change and percentage difference?
Percentage change has a specific direction (increase/decrease from a baseline), while percentage difference compares two values without a specific baseline. Percentage difference uses the average of the two values as the base.
How do I find the original value before a percentage was applied?
If X is Y% of the original, then: Original = X รท (Y รท 100)
Example: If 30 is 20% of the original, then: Original = 30 รท 0.20 = 150
What are common tip percentages?
โข 15% - Standard service
โข 18% - Good service
โข 20% - Excellent service
โข 25%+ - Outstanding service
Remember to tip based on the pre-tax amount!
How do I calculate discounts while shopping?
Sale price = Original price ร (1 - Discount%/100)
Example: $100 item with 30% off = $100 ร 0.70 = $70
How do I calculate markup and profit margin?
โข Markup % = ((Selling Price - Cost) รท Cost) ร 100
โข Profit Margin % = ((Selling Price - Cost) รท Selling Price) ร 100