Percentage Calculator
Calculate percentages, find what percent one number is of another, or compute percent change.
Enter values above to calculate.
Frequently Asked Questions
How do I calculate the percentage of a number?▼
To find X% of a number, multiply the number by X and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30.
How do I find what percentage one number is of another?▼
Divide the part by the whole, then multiply by 100. For example, 30 is what percent of 150? → (30 ÷ 150) × 100 = 20%.
How do I calculate percentage increase or decrease?▼
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase; a negative result is a decrease.
What is 20% of 100?▼
20% of 100 is 20. You can find this by multiplying 100 × 0.20 = 20%.
How do I calculate a tip percentage?▼
Multiply the bill amount by the tip percentage divided by 100. For an 18% tip on a $50 bill: $50 × 0.18 = $9.
What is the percentage difference between two numbers?▼
Percentage difference = |Value1 − Value2| ÷ ((Value1 + Value2) ÷ 2) × 100. This is used when neither value is a reference point.