Percentage Calculator
Compute common percentage problems instantly: find what percentage of a number is, calculate percentage increase or decrease between test scores, and convert raw exam scores into percentages.
Find Percentage of a Number
Formula: (15 ÷ 100) × 80 = 12
Calculate Percentage Proportion
Formula: (42 ÷ 50) × 100% = 84%
Percentage Increase / Decrease
Formula: ((90 - 75) ÷ |75|) × 100 = +20% (difference of 15)
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[2 suggestions]About the Percentage Calculator
The Percentage Calculator provides instant solutions for the three most common percentage calculations: finding a specified percentage of a number (e.g., 15% of 80), finding what percentage one number is of another (e.g., 42 out of 50 points), and calculating percentage change/difference (e.g., difference between midterm and final scores). Results display formatted decimals, formulas, and step-by-step arithmetic explanations.
How is percentage increase/decrease calculated?▾
Percentage change is calculated using the formula: ((New Value - Initial Value) / |Initial Value|) * 100. A positive outcome indicates an increase, while a negative outcome indicates a decrease.
Can I use this to calculate test grade percentages?▾
Yes! Use the "What percent is X of Y" mode to enter your points scored and the total possible points to instantly get your percentage grade.