Percentage Calculator

The Percentage Calculator by SEO Tools System is a free online tool that handles all common percentage calculations. Work out what percent one number is of another, find a percentage of a value, or calculate percentage increase and decrease instantly and accurately.

What is a Percentage Calculator?

A percentage calculator solves percentage problems without manual math. Percentages are used everywhere — discounts, taxes, grades, statistics, and finance — and this tool handles the main calculations: a percentage of a number, what percentage one number is of another, and percentage change.

Common Percentage Formulas

Percentage of a number: (percent ÷ 100) × number. For example, 20% of 150 = 30.

What percent X is of Y: (X ÷ Y) × 100. For example, 30 is 20% of 150.

Percentage change: ((new − old) ÷ old) × 100, giving an increase or decrease.

How Does the Percentage Calculator Work?

You enter your numbers into the calculation you need, and the tool applies the right formula and shows the result instantly.

Features of SEO Tools System's Percentage Calculator

Multiple Calculations — Percentage of a number, percent of a total, and change.

Instant, Accurate Results — Get answers immediately.

Everyday and Business Use — Discounts, taxes, grades, and more.

No Software Needed — Runs in your browser.

Free to Use — No signup required.

How to Calculate Percentages using SEO Tools System?

• Open the Percentage Calculator on SEO Tools System.
• Choose the type of calculation you need.
• Enter your numbers.
• View the result instantly.
• Copy the answer if you need it.

Percentage Calculator FAQs

How do I calculate a percentage of a number?

Divide the percentage by 100 and multiply by the number. For example, 25% of 80 is (25 ÷ 100) × 80 = 20.

How do I calculate percentage increase?

Subtract the old value from the new value, divide by the old value, and multiply by 100. The calculator does this for you.

Do you have a discount calculator?

Yes. Use our Discount Calculator for sale prices.

Is the Percentage Calculator free?

Yes. It is free to use with no account required.

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• Sales Tax Calculator — add or remove sales tax.
• Average Calculator — calculate the average of numbers.
• Probability Calculator — calculate probabilities.
• Age Calculator — calculate age from a date.
• AdSense Calculator — estimate AdSense earnings.