Percentage Calculator
Free online math tool
Calculate percentages fast
Calculate percentages, percentage change, discounts, tips, and more in seconds.
What is a percentage of a number?
Find a percentage of any number.
Result
30
20% of 150 is 30.
What percent is one number of another?
Find what percentage one number is of another.
Result
20%
30 is 20% of 150.
Percentage increase or decrease
Compare an original number with a new number.
Percentage change
25%
This is a 25% increase.
Discount, tip, or tax
Calculate a percentage amount and the final total.
Final total
$85.00
You save $15.00. Per person: $85.00.
How to calculate a percentage
To find a percentage of a number, convert the percentage to a decimal and multiply it by the number. For example, 20% of 150 is 0.20 × 150 = 30.
Percentage of a number = (percentage ÷ 100) × number
How to calculate percentage change
Subtract the original number from the new number, divide the difference by the original number, and multiply by 100. A positive result is an increase; a negative result is a decrease.
Percentage change = ((new number − original number) ÷ original number) × 100
Frequently asked questions
What is 20% of 150?
20% of 150 is 30.
How do I calculate a discount?
Multiply the original price by the discount rate to find the saving, then subtract the saving from the original price.
How do I calculate a tip?
Enter the bill amount and tip rate in the discount, tip, or tax card and choose “Add tax or tip.”
This calculator is provided for general educational and planning purposes. Always verify important financial, tax, or business calculations with the relevant professional or source.