% Math Tool

Percentage Calculator

Calculate any percentage instantly — 4 different calculators in one

What is X% of Y?
% of
Result
–
Percentage Increase / Decrease
→
Percentage Change
–
X is what % of Y?
out of
Percentage
–
Percentage Difference
vs
Difference
–
⚡ Common Percentages — Click to Calculate
5%
Sales tax
10%
Quick tip
15%
Standard tip
20%
Good tip
25%
Discount
50%
Half off

Free Percentage Calculator

This free percentage calculator has four calculators in one. Find a percentage of a number, work out a percentage increase or decrease, see what percent one number is of another, or compare two numbers with the percentage difference. Results appear as you type.

It is handy for discounts, sales tax, tips, grades, price changes, business reports and homework.

How to Use This Calculator

  1. Pick one of the four tabs: X% of Y, % Change, X is % of Y or % Difference.
  2. Type your two numbers into the boxes.
  3. Read the result straight away, along with a one-line explanation of what it means.
  4. Use the Common Percentages buttons for quick calculations such as 10% or 20%.

Percentage Formulas

X% of Y = (X ÷ 100) × Y
% Change = (New − Original) ÷ |Original| × 100
X is what % of Y = (X ÷ Y) × 100
% Difference = |A − B| ÷ ((A + B) ÷ 2) × 100

Examples:

Frequently Asked Questions

How do I calculate a percentage of a number?

Divide the percentage by 100 and multiply by the number. For example, 20% of 500 is 0.20 × 500 = 100. Use the first tab (X% of Y) to do this instantly.

How do I calculate a percentage increase or decrease?

Subtract the original value from the new value, divide by the original value, then multiply by 100. Going from 100 to 150 is a 50% increase. Going from 200 to 150 is a 25% decrease.

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

Divide the first number by the second and multiply by 100. For example, 25 out of 200 is 25 ÷ 200 × 100 = 12.5%. Use the "X is % of Y" tab.

What is the difference between percentage change and percentage difference?

Percentage change compares a new value to an original value, so the order matters. Percentage difference compares two values without calling either one the original, and it divides by their average. Use change for things like price rises and difference for comparing two similar measurements.

How do I calculate a discount?

Find the discount amount by taking the discount percentage of the price, then subtract it. A 25% discount on an $80 item is $20 off, so you pay $60.

Can a percentage be more than 100%?

Yes. A percentage over 100% means the amount is bigger than the reference value. For example, going from 50 to 150 is a 200% increase.

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Note: Results are shown rounded to two decimal places in most cases.