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.

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