CalcHub

Percentage Calculator | Free Online Tool - CalcHub

Free percentage calculator. Calculate percentages, percentage change, percentage difference, and more. Solve any percentage problem instantly.

What is% of?

Result

20% of 150 = 30

Formula

20% of 150

Step-by-Step Solution

  1. Convert percentage to decimal: 20% = 20 / 100 = 0.2000
  2. Multiply by the number: 0.2000 × 150 = 30.0000

What is Percentage Calculator?

The Percentage Calculator is a free online tool that solves any percentage problem instantly. It supports four common calculation modes: finding a percentage of a number, finding what percentage one number is of another, calculating percentage change between two values, and finding the percentage difference. Each calculation shows the formula and step-by-step solution so you can understand the math.

How to Use Percentage Calculator

Choose a calculation mode: (1) What is X% of Y? (2) X is what % of Y? (3) Percentage change from X to Y (4) Percentage difference between X and Y. Enter the required values and see the result instantly with a step-by-step formula breakdown.

How Percentage Calculator Works

Each mode uses a specific formula: (1) X% of Y = (X/100) * Y. (2) X is what % of Y = (X/Y) * 100. (3) Percentage change = ((New - Old) / Old) * 100. (4) Percentage difference = (|A - B| / ((A + B) / 2)) * 100. All calculations happen instantly in your browser.

Common Use Cases

  • Calculating discounts and sale prices while shopping
  • Finding percentage change in stock prices or investment returns
  • Computing grade percentages for school assignments
  • Determining tip amounts at restaurants
  • Calculating tax amounts on purchases

Frequently Asked Questions

How do I calculate a percentage of a number?▼

To calculate X% of Y, multiply Y by X and divide by 100. For example, 20% of 150 = (20/100) * 150 = 30.

What is the difference between percentage change and percentage difference?▼

Percentage change measures the change from an old value to a new value relative to the old value. Percentage difference measures how two values differ relative to their average, without implying one is the "original."

How do I calculate what percentage one number is of another?▼

Divide the part by the whole and multiply by 100. For example, 30 is what percent of 150? (30/150) * 100 = 20%.

Can percentage change be negative?▼

Yes. A negative percentage change indicates a decrease. For example, going from 200 to 150 is a -25% change.

Related Tools

Compound Interest Calculator

Enter principal, monthly contributions & rate, get a year-by-year growth table w...

Tip Calculator

Free tip calculator with bill splitting. Calculate tip amounts, split bills betw...

Loan Calculator

Free loan calculator. Calculate monthly payments, total interest, and amortizati...

Explore More Free Tools

Discover more tools from our network — all free, browser-based, and privacy-first.

CSS Grid Generator

CSSKit

JWT Decoder

DevToolKit

Meta Tag Generator

SEOKit

JSON Formatter

ToolBox Online

PNG to JPG

ImageToolKit

UUID Generator

DevToolKit