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.
Master percentage calculations with these simple methods:
Formula: (Percentage ÷ 100) × Number
Example: What is 15% of 200?
(15 ÷ 100) × 200 = 0.15 × 200 = 30
Formula: Original × (1 + Percentage/100)
Example: Increase 100 by 20%
100 × (1 + 20/100) = 100 × 1.20 = 120
Formula: Original × (1 - Percentage/100)
Example: Decrease 500 by 25%
500 × (1 - 25/100) = 500 × 0.75 = 375
Formula: |V1 - V2| / [(V1 + V2)/2] × 100
Example: Difference between 50 and 75
|50-75| / [(50+75)/2] × 100 = 25/62.5 × 100 = 40%
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%
Calculate sale prices, discounts, and savings. Find final price after 30% off, or how much you save on clearance items.
Calculate restaurant tips (15%, 18%, 20%), service charges, and gratuities. Split bills and add appropriate tips easily.
Calculate interest rates, investment returns, profit margins, and portfolio performance. Track financial growth over time.
Convert marks to percentages (45 out of 60 = 75%). Calculate GPA, test scores, and academic performance metrics.
Calculate sales tax, GST, VAT, and other taxes. Add tax to prices or find pre-tax amounts from totals.
Track growth rates, market share, conversion rates, and KPIs. Compare performance metrics and analyze trends.
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.
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.
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.
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%.
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.
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.
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.
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.
