How to Use This Percentage Calculator

Whether you are calculating a store discount, figuring out a restaurant tip, or solving math homework, our free Percentage Calculator makes finding the right numbers instant and completely error-free.

1. Find the Percentage (What is X% of Y?)

Use this first tool when you know the total amount and the percentage you want to extract.

• Example: You want to leave a 20% tip on a $150 dinner bill.
• How to use: Type 20 in the first box and 150 in the second box. Click calculate to see that the tip is $30.

2. Find the Rate (X is what % of Y?)

Use the second tool when you have two numbers and need to know the ratio between them expressed as a percentage.

• Example: You scored 30 points out of a possible 150 points on a test.
• How to use: Type 30 in the first box and 150 in the second box. Click calculate to see that you got a 20%.

3. Percentage Decrease

Use this tool to find out how much a value has dropped in terms of a percentage.

• Example: A pair of shoes originally cost $100, but is now on sale for $80.
• How to use: Type 100 in the first box and 80 in the second box. Click calculate to see that the price decreased by 20%.

4. Percentage Increase

Use this tool to find out how much a value has grown in terms of a percentage.

• Example: Your monthly grocery bill went up from $80 to $100.
• How to use: Type 80 in the first box and 100 in the second box. Click calculate to see that your bill increased by 25%.

5. Percentage Difference

Use this tool when you want to compare two different numbers to see the distance between them as a percentage.

• Example: You want to compare two competing product prices, $50 and $60.
• How to use: Type 50 in the first box and 60 in the second box. Click calculate to see the percentage difference is 18.18%.

6. Increase a Number by a Percentage

Use this tool when you have a starting number and want to add a specific percentage on top of it.

• Example: You have a $100 bill and need to add a 20% late fee.
• How to use: Type 100 in the first box and 20 in the second box. Click calculate to see the new total is $120.

7. Decrease a Number by a Percentage

Use this tool when you have a starting number and want to subtract a specific percentage from it.

• Example: You are buying a $100 item with a 20% discount coupon.
• How to use: Type 100 in the first box and 20 in the second box. Click calculate to see the final price is $80.