Percentage Calculator

Simple Percentage Calculator

Quickly answer common percent questions: What percent is X of Y? What is the percent increase from A to B? What is the percent decrease? This calculator is designed for everyday tasks like discounts, markups, grades, tips, and quick comparisons. It runs entirely in your browser for speed and privacy.

Formulas used

• X% of Y: (X ÷ 100) × Y
• What percent is X of Y? (X ÷ Y) × 100
• Percent increase: ((New − Original) ÷ Original) × 100
• Percent decrease: ((Original − New) ÷ Original) × 100

Examples

• Sale price: If $30 is reduced to $24, the percent decrease is ((30 − 24) ÷ 30) × 100 = 20%
• Grades: If you scored 42 out of 50, that is (42 ÷ 50) × 100 = 84%
• Growth: From 120 to 150 is ((150 − 120) ÷ 120) × 100 = 25% increase

Tips

• Results are rounded to two decimals for readability
• Ensure Y (the denominator) is not zero when computing “X is what % of Y”
• Use the Clear button to reset inputs before switching panels

Whether you’re checking a discount, comparing metrics, or calculating grade percentages, this tool gives clear results with minimal steps.