ToolsPopper
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Percentage Calculator

Find percentages, increases, decreases, and percent of any number.

ToolsPopper's Percentage Calculator handles three common percent problems in one tool: find X% of Y, calculate percent change between two values, and determine what percent X is of Y. Switch modes with one click, enter two values, and get an instant answer — no manual formula lookup required.

Percentage Calculator — Find percentages, increases, decreases, and percent of any number

What is the Percentage Calculator?

All percentage math runs locally in your browser. Your homework figures, sale prices, and budget numbers stay completely private.

When to use a percentage calculator

  • Math homework — verify percent-of, percent-change, and ratio problems
  • Shopping discounts — calculate sale prices and savings amounts
  • Finance — find tip percentages, tax amounts, and investment returns
  • Business — measure growth rates and market share changes

How the Percentage Calculator works

How to use Percentage Calculator — step-by-step guide

Choose a mode: X% of Y computes (X ÷ 100) × Y; percent change finds ((new − old) ÷ old) × 100; and "X is ?% of Y" computes (X ÷ Y) × 100. Enter values A and B according to the active mode and click Calculate.

How to calculate percentages

  1. Select the mode: X% of Y, percent change, or X is ?% of Y.
  2. Enter Value A and Value B as labeled for that mode.
  3. Click Calculate to see the result.
  4. Switch modes to solve different problem types on the same page.

ToolsPopper vs Calculator.net

  • Three modes in one page — percent-of, change, and ratio without navigating separate URLs
  • Unlimited free use — no throttled sessions
  • 100% private — values processed on your device only
  • No signup — calculate immediately
  • Mobile-friendly — quick discount checks while shopping

More free calculators on ToolsPopper

Percentage Calculator works even better alongside our other utilities. Try BMI Calculator, Tip Calculator and Age Calculator — every tool in our Calculators collection is free, runs without signup, and keeps your data private.

Frequently Asked Questions

Common questions about Percentage Calculator

What are the three calculation modes?

X% of Y finds a percentage of a number. Percent change measures growth or decline between two values. X is ?% of Y finds what percentage one number represents of another.

How do I calculate a discount?

Use X% of Y mode: enter the discount percentage as A and the original price as B. Subtract the result from the original price for the sale price.

Is this percentage calculator free?

Yes. Calculate unlimited percentages with no account, subscription, or daily limit.

Can I use this for math homework?

Yes. It covers the most common percent problems in middle school through business math. Show your formula steps on paper if your teacher requires work shown.

Are my numbers sent to a server?

No. All percentage calculations run entirely in your browser. ToolsPopper never receives or stores the values you enter.

How does this compare to Calculator.net's percentage calculator?

Calculator.net offers extensive percent tools on a server-rendered page. ToolsPopper provides three core modes with unlimited free use, no signup, and fully private browser processing.

Does it work on mobile phones?

Yes. Open the page on iPhone or Android, pick a mode, enter your values, tap Calculate, and read the result instantly.

How accurate are the results?

Results use JavaScript floating-point math, displayed to two or four decimal places depending on the mode. Suitable for homework, shopping, and everyday finance.