📐 Percentage Calculator
Free percentage calculator supporting three calculation types: what percent is X of Y, what is X% of Y, and percentage increase/decrease. Choose your calculation type and get instant results.
❓Frequently Asked Questions
How do you calculate what percentage one number is of another?▼
Divide the part by the total and multiply by 100. For example, if the part is 20 and the total is 80, the calculation is (20 ÷ 80) × 100 = 25%.
How do you calculate what is a percentage of a number?▼
Multiply the percentage by the number and divide by 100. For example, 20% of 100 is (20 × 100) ÷ 100 = 20.
How do you calculate percentage increase or decrease?▼
Use the formula: ((new value - old value) ÷ old value) × 100. A positive result is an increase, negative is a decrease.
Can the total be zero?▼
No, the total cannot be zero because division by zero is mathematically undefined. The calculator will show an error message if you try to use zero as the total.