Percentage Calculator

How to Calculate Percentages

What is X% of Y?

To find a percentage of a number, multiply the number by the percentage (expressed as a decimal). For example, 10% of 200 = 200 × 0.10 = 20.

X is what percent of Y?

To find what percent one number is of another, divide the first number by the second and multiply by 100. For example, 30 is what percent of 150? 30 ÷ 150 × 100 = 20%.

Percentage Increase or Decrease

To calculate percentage change, subtract the original value from the new value, divide by the original value, and multiply by 100. A positive result is an increase; a negative result is a decrease.

Practical Uses for Percentage Calculator

• Discounts and sales: Calculate how much you save during a sale.
• Tips and gratuities: Quickly work out a tip percentage.
• Tax calculations: Determine GST or VAT amounts.
• Grade calculations: Work out test scores and final grades.
• Budgeting: Calculate what percentage of income goes to expenses.

Frequently Asked Questions

How do I calculate 10% of a number?

To calculate 10% of a number, divide the number by 10. For example, 10% of 250 = 250 ÷ 10 = 25.

How do I calculate percentage increase?

Subtract the original value from the new value, divide by the original value, then multiply by 100. For example, if a price rises from $50 to $60: (60 - 50) ÷ 50 × 100 = 20% increase.

How do I calculate a percentage of a total?

Divide the part by the total and multiply by 100. For example, if you scored 45 out of 60: 45 ÷ 60 × 100 = 75%.

What is percentage?

A percentage is a way of expressing a number as a fraction of 100. The word comes from the Latin "per centum" meaning "by the hundred". It is denoted using the % symbol.

How do I convert a fraction to a percentage?

Divide the numerator by the denominator, then multiply by 100. For example, 3/4 = 0.75 × 100 = 75%.