Calculate any percentage: what is X% of Y, percentage change, percentage difference, and more. Free percentage calculator. No signup.
Percentage calculations come up dozens of times daily — tips at restaurants, discounts while shopping, tax calculations, investment returns, and business metrics. Most people struggle with percentage change versus percentage difference. Our calculator handles every percentage type with clear explanations so you always get the right answer.
Type 1: What is X% of Y? Example: 15% of $85 = $12.75. Formula: Y × (X/100). Type 2: X is what percent of Y? Example: $12 is what % of $80 = 15%. Formula: (X/Y) × 100. Type 3: Percentage increase or decrease. Example: $80 to $100 = 25% increase. Formula: ((New-Old)/Old) × 100. Type 4: Find original value after percentage change. Example: $100 after 25% increase = original was $80. Formula: New / (1 + rate). Type 5: Percentage difference between two numbers. Formula: |A-B|/((A+B)/2) × 100.
Common business percentage uses: Profit margin: (Revenue - Cost) / Revenue × 100. Year-over-year growth: (This year - Last year) / Last year × 100. Sales tax calculation: Price × (1 + tax rate). Discount calculation: Original price × (1 - discount rate). Example: $200 item with 20% off = $200 × 0.80 = $160. Commission calculation: Sales amount × commission rate. Return on investment: (Gain - Cost) / Cost × 100.
Percentage increase formula: ((New Value - Old Value) / Old Value) × 100. Example: sales went from $50,000 to $65,000. ($65,000 - $50,000) / $50,000 × 100 = 30% increase. For decrease: same formula gives a negative number. Common mistake: confusing percentage points with percentages. Interest rate going from 5% to 6% is a 1 percentage point increase but a 20% relative increase.
Percentage change: directional comparison from one value to another (old to new). Formula: (New - Old) / Old × 100. Percentage difference: symmetric comparison between two values (neither is the reference). Formula: |A - B| / ((A+B)/2) × 100. When to use each: percentage change for time-based comparisons (revenue growth). Percentage difference for comparing two things without a clear baseline (comparing two prices).
Formula: (Part / Whole) × 100. Example 1: You scored 45 out of 60. 45 / 60 × 100 = 75%. Example 2: Marketing spend is $15,000 out of $100,000 total revenue. 15,000 / 100,000 × 100 = 15% marketing-to-revenue ratio. Example 3: 3 out of 25 employees are remote. 3 / 25 × 100 = 12% remote workforce percentage.
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The Percentage Calculator — All Percentage Calculations in One Place uses the same formulas, rates, and reference data that financial planners, professionals, and government sources publish. Results are estimates intended for planning and education — for situations involving large sums or legal consequences, confirm with a qualified professional before acting.
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