Percentage Calculator – Free Online All-in-One % Calculator

Free Online Percentage Calculator

Calculate percentages, percentage increase, decrease, difference and more – all in one fast and easy tool.

What is % of ?

is what percent of ?

From to – what is the % change?

Add % to

Subtract % from

is % of what number?

Percentage difference between and

Enter your numbers above and press Calculate to see the answer with the formula.

What Is a Percentage Calculator?

A percentage calculator is an online tool that solves everyday percent problems in seconds. Whether you are working out a discount while shopping, checking exam marks, calculating GST or tax, measuring business growth, or comparing two prices, this free percentage calculator gives you the exact answer instantly – no formulas to remember.

Percentage Formulas Used in This Tool

X% of Y(X ÷ 100) × Y

X is what % of Y(X ÷ Y) × 100

Percentage change((New − Old) ÷ Old) × 100

Add X%Y × (1 + X ÷ 100)

Subtract X%Y × (1 − X ÷ 100)

Find original numberValue ÷ (Percentage ÷ 100)

Percentage difference|A − B| ÷ ((A + B) ÷ 2) × 100

How to Use the Percentage Calculator

Choose the type of calculation from the tabs, type your numbers into the boxes, and click Calculate. The result appears immediately along with the formula used, so you can learn as you calculate.

Common Uses of Percentage Calculations

Shopping discounts and sales

Use the Subtract X% tab to find the final price after a discount, or X% of Y to see how much you save.

Taxes, GST and tips

Use the Add X% tab to add tax or a tip to any bill.

Growth, profit and marks

Use Percentage Change to track increase or decrease in sales, salary, or prices, and X is what % of Y to convert marks into a percentage score.

Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30.

How do I calculate percentage increase?

Subtract the old value from the new value, divide the result by the old value, then multiply by 100. A positive answer means an increase and a negative answer means a decrease.

What is the difference between percentage change and percentage difference?

Percentage change compares a new value to an original value. Percentage difference compares two values without treating either one as the original.

Is this percentage calculator free?

Yes. This tool is 100% free, works on mobile, tablet and desktop, and needs no sign-up.