Percentage Calculator

% of a number, % change & more

What do you want to calculate?

Percent (%)

Of value

20% of 150 is

Percentage Calculator — guide & how to use

What it does

This percentage calculator handles the three everyday percentage questions: what is X% of a number, X is what percent of Y, and the percent change (increase or decrease) between two numbers. Calculated privately in your browser, free.

How to use it

Pick the type of percentage question with the buttons.
Enter the two values — the labels update to match.
Read the answer and the formula used.

How to embed this tool on your website

No account, no coding. Copy the embed code and paste it where you want it to appear:

<iframe src="https://snaptoolsuite.com/percentage-calculator/?embed=1"
  style="width:100%;max-width:560px;height:700px;border:0;"
  title="Percentage Calculator" loading="lazy"></iframe>
<p>Free <a href="https://snaptoolsuite.com/percentage-calculator/">Percentage Calculator</a> by Snap Tool Suite</p>

2 Paste it on your page

3 It just works

See it live: view a real embed example →

Frequently asked questions

How do I find X% of a number?

Multiply the number by the percent divided by 100. For example, 20% of 150 = 150 × 0.20 = 30. Switch to the ‘% of a number’ mode and the tool does it for you.

How do I calculate percent change?

Subtract the old value from the new value, divide by the old value, then multiply by 100. A move from 80 to 100 is (100−80)/80 × 100 = +25%. Use the ‘% change’ mode.

Is it really free?

Yes — 100% free. Everything is calculated privately in your browser; nothing is stored or sold.

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🔒 Everything is calculated in your browser. We don't store or sell your data.