Everyday tool

Percentage Calculator

Solve the most common percentage questions: what is X% of Y, what percent A is of B, and percentage increase or decrease.

Start tool ← Back to home View everyday maths cluster

Instant useNo sign up, quick result.

Practical outputBuilt for real everyday checks.

Clear next stepJump from result to related guides.

What this tool helps with

Use this percentage calculator for discounts, markups, grade changes, price moves and everyday maths.

Quick start

Enter your values, review the result and use the guide block below for a clearer explanation, example and related tools.

1) What is X% of Y?

Percent (%)

Number

Answer

2) A is what percent of B?

Answer

75%

3) Percentage increase or decrease

Original value

New value

Change

25%

This is a percentage increase.

Quick examples

Question

Input

Result

What is 20% of 150?

20 and 150

45 is what percent of 60?

45 and 60

75%

80 to 100

original 80, new 100

25% increase

FAQ

How do you calculate a percentage of a number?

Multiply the number by the percentage and divide by 100.

How do you calculate percentage change?

Subtract the original value from the new value, divide by the original, then multiply by 100.

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Guide

How percentage calculations work

Percentage calculations compare a number to 100 and are used in pricing, finance, school and daily life.

This tool helps with common percentage tasks such as finding a percentage of a number, change between two numbers, and increase or decrease.

Example

Example use case

If you want to find 20% of 80, the calculator multiplies 80 by 0.20 to get 16. For percentage change, it compares the difference against the original value.

Frequently asked questions

What is percentage change?

Percentage change shows how much a value has gone up or down relative to the starting value.

Can I use this for discounts?

Yes. It is useful for sale prices, VAT checks, markups and everyday shopping maths.

Why are percentages useful?

They make comparisons easier by putting different values on the same 0 to 100 scale.

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Explore related tools

Use the related tools below to compare scenarios, check supporting numbers or solve nearby tasks faster.

Tool guide

How to use the percentage calculator

Calculate percentages, percentage increase, decrease and change with a free online percentage calculator. Use this page for a fast estimate, compare a few scenarios, and adjust the inputs until the result matches what you need to decide.

This tool also sits inside the CalcBeacon everyday maths and time cluster. That makes it easier to find from category pages, related tools, and supporting guides when you want to compare options.

When it is usefulUse this tool when you want a fast estimate, want to compare options, or want a clearer answer before moving on.

Common mistakesCheck that your numbers use the same units, avoid leaving key fields blank, and test a second scenario so you can see how sensitive the final result is.

Next useful stepAfter using this page, compare the result with a related calculator or open the guide to check the number in context.

Related tools

Use these related tools to compare nearby calculations and move to the next step faster.