Percentage Calculator

Find percent of, percent is, and percent increase or decrease.

  • 100% free
  • No sign-up
  • Instant results
  • Privacy-friendly

What is % of ? —

is what percent of ? —

Change from to ? —

About the Percentage Calculator

Calculate percentages instantly with this free percentage calculator. Find X% of Y, solve “X is what percent of Y?”, and compute percent increase or decrease from A to B — all with live results as you type.

Useful for discounts, tips, tax estimates, grade weighting, growth rates, and everyday money math. No formulas to memorize and no spreadsheet required.

The Percentage Calculator on The 360 Tools is free, private, and works in any modern browser.

How to use the Percentage Calculator

Pick the mode you need — percent of, percent is, or percent change — enter the numbers, and read the live result.

  1. 1 Choose a calculation mode: percent of, “is what percent,” or percent change.
  2. 2 Enter the values prompted for that mode (for example, percentage and base, or original and new amounts).
  3. 3 Read the result instantly — it updates live as you change inputs.
  4. 4 Switch modes for another problem without leaving the page.

Features of our Percentage Calculator

Three common percentage problems in one tool, with live results and a clean layout for phones and desktops.

X% of Y

Quickly find a percentage of any number — discounts, tips, commissions, and partial amounts.

X is what % of Y

Solve reverse percentage questions: what percent one value is of another.

Percent change

Calculate increase or decrease from A to B for growth, markdowns, and before/after comparisons.

Live results

Numbers update as you type so you can explore scenarios without clicking Calculate repeatedly.

Everyday clarity

Plain labels help you pick the right mode instead of wrestling with spreadsheet formulas.

Free & unlimited

No account and no limits — run as many percentage checks as you need.

Who uses our Percentage Calculator?

Shoppers, students, analysts, and small business owners all need quick percentage math — this tool covers the classics.

Shoppers & budgeters

Work out sale discounts, tips, and “what percent of my budget is this?” questions on the go.

Students & teachers

Check homework, grade weights, and exam score percentages without a graphing calculator.

Retail & sales teams

Compute markups, markdowns, and commission percentages during conversations with customers.

Analysts & founders

Quick growth or decline percentages between two metrics before opening a full spreadsheet.

Freelancers

Estimate tax set-asides, fee percentages, and client discount offers in seconds.

Coaches & fitness

Calculate percent of max weight, progress toward goals, or change between check-ins.

Why use our Percentage Calculator?

Percentage mistakes are common when you flip formulas under pressure. A dedicated calculator keeps the modes clear.

  1. 01

    Right mode, right answer

    Separate flows for “percent of,” “is what percent,” and “percent change” reduce mix-ups.

  2. 02

    Faster than a spreadsheet

    Open the page and type — no workbook, no cell formulas, no formatting.

  3. 03

    Mobile-friendly math

    Built for phones as well as desktops when you are comparing prices in a store aisle.

  4. 04

    Always free

    Unlimited calculations with no signup and no ads blocking the result.

People also ask

How do I calculate a percentage increase?

Subtract the original value from the new value, divide the result by the original value, then multiply by 100. The calculator does this automatically for you.

What percentage calculations are included?

You can find X% of Y, solve “X is what percent of Y?”, and calculate percent change (increase or decrease) from A to B — all with live results.

Is the Percentage Calculator free?

Yes. Unlimited calculations with no account. Everything runs in your browser.

Is the Percentage Calculator free to use?

Yes. The Percentage Calculator is completely free with no sign-up, no hidden charges and no usage limits. All tools on The 360 Tools are free forever.

Is my data safe when using the Percentage Calculator?

Yes. Your input is processed locally in your browser whenever possible and is never stored on our servers or shared with third parties.

Does the Percentage Calculator work on mobile?

Yes. The Percentage Calculator is built mobile-first and works on any modern phone, tablet or desktop browser without installing anything.

Embed this tool on your website

Add the free Percentage Calculator to your own site or blog — copy the snippet below and paste it into your HTML. It's free for any website; we only ask that you keep the credit link.

Related tools

Love Calculator

A fun tool to calculate compatibility between names.

Open tool

Age Calculator

Calculate exact age in years, months, and days — plus totals and next birthday.

Open tool

Date Difference Calculator

Find the difference between any two dates.

Open tool

Days Until Calculator

Count days until or since any date or event.

Open tool