Percentage Calculator

Calculate percentages quickly and easily. Use the tools below to find a percentage of a number, calculate what percentage one number is of another, or calculate percentage increases and decreases.

What is X% of Y?

Example: 20% of 150 = 30

X is what percentage of Y?

Example: 30 is what percentage of 150? = 20%

Percentage increase

Example: 100 to 125 = 25% increase

Percentage decrease

Example: 125 to 100 = 20% decrease

Common Percentage Calculations

A few everyday examples, worked out using the formula (percentage ÷ 100) × number.

What is 10% of 100?: 10 ÷ 100 × 100 = 10
What is 15% of 200?: 15 ÷ 100 × 200 = 30
What is 20% of 500?: 20 ÷ 100 × 500 = 100
What is 25% of 80?: 25 ÷ 100 × 80 = 20
What is 50% of 250?: 50 ÷ 100 × 250 = 125
What is 75% of 400?: 75 ÷ 100 × 400 = 300

More Calculators

How to Calculate a Percentage

A percentage describes a part of something as a share of 100. "Per cent" literally means "per hundred," so 45% means 45 out of every 100. To turn any part-to-whole relationship into a percentage, divide the part by the whole and multiply by 100:

Percentage = (Part ÷ Whole) × 100

18 out of 24 questions correct: 18 ÷ 24 × 100 = 75%
A $12 tip on a $60 bill: 12 ÷ 60 × 100 = 20%
3 rainy days in a 30-day month: 3 ÷ 30 × 100 = 10%

How to calculate a percentage of a number

Convert the percentage to a decimal by dividing it by 100, then multiply by the number. For 15% of 80: 15 ÷ 100 = 0.15, and 0.15 × 80 = 12.

How to calculate percentage increase

Subtract the original value from the new value, divide the difference by the original value, and multiply by 100. A rent that rises from $1,200 to $1,320 went up by 120, and 120 ÷ 1,200 × 100 = 10% increase.

How to calculate percentage decrease

Subtract the new value from the original value, divide by the original value, and multiply by 100. A price that drops from $50 to $40 fell by 10, and 10 ÷ 50 × 100 = 20% decrease. Note that increases and decreases are not symmetrical: going from 40 back to 50 is a 25% increase, because the starting point is smaller.

These calculators provide mathematical estimates. Please verify results independently before relying on them for financial, tax, legal, medical, or other consequential decisions. Nothing on this site is professional advice.