Percentage Calculator

_ is ?% from _

Enter a value and a base to find the percentage.

_% from _ is?

Enter a percentage and a base to calculate the value.

🔢 _ increased/decreased to _ is ?%

Find percentage change between original and new number.

❓ What is _% of _?

Get the value of X percent of a number.

How to calculate percentages

A percentage expresses a number as a fraction of 100. The three most common calculations are:

  • X% of Y: multiply Y by X and divide by 100 — e.g. 20% of 150 = 150 × 20 ÷ 100 = 30.
  • What percent X is of Y: divide X by Y and multiply by 100 — e.g. 30 of 150 = 30 ÷ 150 × 100 = 20%.
  • Percentage change: subtract the old value from the new, divide by the old, and multiply by 100 — a positive result is an increase, a negative one a decrease.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 200 × 15 ÷ 100 = 30. Use the 'What is X% of Y' card above.

How do I find what percentage one number is of another?

Divide the part by the whole and multiply by 100. For example, 45 out of 60 is 45 ÷ 60 × 100 = 75%.

How do I calculate percentage increase or decrease?

Subtract the original value from the new value, divide by the original, and multiply by 100. A result above zero is an increase; below zero is a decrease.

How do I calculate a discount or percent off?

Find the percentage of the price, then subtract it. A 25% discount on $80 is 80 × 25 ÷ 100 = $20 off, giving a final price of $60.

Related calculators