Percentage Calculator - Calculate Percentages Online
Calculate percentages instantly with our free online calculator. Find percentage of a number, percentage increase/decrease, percentage difference, and more. Easy, accurate, and works for all percentage calculations.
What is 15% of 200?
Increase 100 by 20%
Decrease 500 by 25%
Percentage difference between 50 and 75
Common Percentage Calculations
How to Calculate Percentages
Master percentage calculations with these simple methods:
Basic Percentage
Formula: (Percentage ÷ 100) × Number
Example: What is 15% of 200?
(15 ÷ 100) × 200 = 0.15 × 200 = 30
Percentage Increase
Formula: Original × (1 + Percentage/100)
Example: Increase 100 by 20%
100 × (1 + 20/100) = 100 × 1.20 = 120
Percentage Decrease
Formula: Original × (1 - Percentage/100)
Example: Decrease 500 by 25%
500 × (1 - 25/100) = 500 × 0.75 = 375
Percentage Difference
Formula: |V1 - V2| / [(V1 + V2)/2] × 100
Example: Difference between 50 and 75
|50-75| / [(50+75)/2] × 100 = 25/62.5 × 100 = 40%
Percentage Formulas
Basic Percentage: Find percentage of any number. Example: 20% of 150 = (20÷100) × 150 = 30
Percentage Increase: Add percentage to original. Example: 100 + 25% = 100 × 1.25 = 125
Percentage Decrease: Subtract percentage from original. Example: 200 - 30% = 200 × 0.70 = 140
Percentage Change: Find change between two values. Example: From 50 to 75 = [(75-50)/50] × 100 = 50%
Real-World Percentage Uses
Shopping & Discounts
Calculate sale prices, discounts, and savings. Find final price after 30% off, or how much you save on clearance items.
Tips & Service Charges
Calculate restaurant tips (15%, 18%, 20%), service charges, and gratuities. Split bills and add appropriate tips easily.
Finance & Investments
Calculate interest rates, investment returns, profit margins, and portfolio performance. Track financial growth over time.
Grades & Scores
Convert marks to percentages (45 out of 60 = 75%). Calculate GPA, test scores, and academic performance metrics.
Taxes & Fees
Calculate sales tax, GST, VAT, and other taxes. Add tax to prices or find pre-tax amounts from totals.
Business Analytics
Track growth rates, market share, conversion rates, and KPIs. Compare performance metrics and analyze trends.
Frequently Asked Questions
How do I calculate percentage of a number?
Divide the percentage by 100, then multiply by the number. For example, to find 20% of 150: (20 ÷ 100) × 150 = 0.20 × 150 = 30. Or use our calculator's "Basic %" tab for instant results.
What's the difference between percentage increase and percentage change?
Percentage increase adds a percentage to the original value (100 + 20% = 120). Percentage change calculates the relative difference between two values as a percentage. Both are useful for different scenarios.
How to calculate percentage discount?
Use the percentage decrease formula. For 30% off $80: $80 × (1 - 30/100) = $80 × 0.70 = $56. You save $24. Use our "% Decrease" tab to calculate any discount instantly.
How to convert fraction to percentage?
Divide numerator by denominator, then multiply by 100. Example: 3/4 = 0.75 × 100 = 75%. Or for scores: 45 out of 60 = (45 ÷ 60) × 100 = 75%.
What is percentage difference vs percentage change?
Percentage change uses the original value as base (old to new). Percentage difference uses the average of both values as base (symmetric). Use percentage change for trends, percentage difference for comparing two values.
How to calculate tip percentage?
Multiply bill amount by tip percentage. For 18% tip on $45: $45 × 0.18 = $8.10. Total with tip: $45 + $8.10 = $53.10. Use "Basic %" tab for quick tip calculations.
Can percentages be more than 100%?
Yes! Percentages above 100% represent values greater than the original. For example, 200% of 50 = 100 (double the original). Common in growth rates and comparisons.
How to reverse calculate percentage?
If you know the result and percentage, divide result by (1 + percentage/100). Example: After 20% increase, value is 120. Original = 120 ÷ 1.20 = 100.