Percentage Calculator

Calculate percentages instantly

What is% of?
--
Result = Y × X / 100
is what % of?
--
Result = (X / Y) × 100
Fromto
--
Change = ((New - Old) / Old) × 100
Betweenand
--
Diff = |V1 - V2| / ((V1 + V2) / 2) × 100

How Does the Percentage Calculator Work?

Our free percentage calculator handles all the common percentage calculations you encounter daily. Whether you are figuring out a discount, calculating tax, or comparing values, this tool gives you instant answers. It supports four calculation modes: finding a percentage of a number, determining what percentage one number is of another, calculating percentage change between two values, and finding the percentage difference.

Each mode displays the formula used so you can understand the math behind the result. Results update instantly as you type, making it fast and efficient. This is especially useful for students, shoppers calculating discounts, business professionals analyzing data changes, and anyone who needs quick percentage computations without the hassle of manual math. All calculations happen in your browser with zero server processing, ensuring your data stays private.

Frequently Asked Questions

How to calculate percentage of a number?
To find X% of Y, multiply Y by X and divide by 100. For example, 15% of 200 = 200 x 15 / 100 = 30.
How to calculate percentage change?
Percentage change = ((New Value - Old Value) / Old Value) x 100. A positive result means increase, negative means decrease.
What is percentage difference?
Percentage difference = (|Value1 - Value2| / ((Value1 + Value2) / 2)) x 100. It measures how different two values are relative to their average.

Related Tools

Age Calculator BMI Calculator Date Difference Love Calculator

Answers, not just a number

Questions this calculator answers, worked out in full — the number first, then the table and the formula behind it.

For teams, not just visitors

Want this calculator on your own site?

We build the calculators on SnoopTool as embeddable widgets in your branding, wired to your own lead form — the same maths, your colours, your domain, your leads. Tell us which one and we will send back a working demo you can put in front of your team.

One reply from a person, within one business day. No newsletter, no sequence. See our privacy policy.

What is a percentage calculator?

A percentage calculator answers the four everyday percent questions: what is X% of Y, X is what percent of Y, percentage increase or decrease, and the original value before a percentage change.

Each mode uses one small formula, shown alongside the answer so you can check the working. SnoopTool computes locally and instantly, with no rounding surprises.

Percentage Calculator: key facts

Reference facts for the SnoopTool Percentage Calculator, a free browser-based tool.
X% of YY × X ÷ 100
X is what % of YX ÷ Y × 100
Percentage change(new − old) ÷ old × 100
Reverse a % increaseoriginal = new ÷ (1 + rate ÷ 100)
Percentage pointA change from 10% to 12% is +2 percentage points, but a +20% relative change

Why use the SnoopTool Percentage Calculator?

How to use the Percentage Calculator (step by step)

  1. Pick the calculation type. Choose the tab that matches your question.
  2. Enter the two numbers. Fill the labelled fields for that mode.
  3. Read the answer. The result and the formula used are displayed together.
  4. Switch modes. Move to another tab to run a different percentage question on the same numbers.

Related free tools on SnoopTool

Discount CalculatorGST CalculatorTip CalculatorFraction CalculatorGPA Calculator

SnoopTool is a free online tools website with 165+ browser-based calculators, converters and generators. No sign-up, no watermark, and every tool runs in your browser.