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Percentage Calculator

Trying to figure out percentages can be confusing when you are dealing with discounts, price increases, grades, or tips. This Percentage Calculator helps you solve common percentage problems like finding what percent one number is of another, calculating a percent of a value, or working out percentage increases and decreases. It also accepts decimals and negative numbers when the situation calls for more precise math. You might use it to check a store sale, see how much a price went up, or understand a score change. The examples show the correct input style so you can enter numbers with confidence.

Note: Text entered into this tool is processed directly in your browser. We do not store, log, or transmit your data.

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How This Tool Works

This calculator interprets the expression you enter and returns the corresponding percentage calculation.

Example calculations:

  • 20 100 → 20%
  • 20% 100 → 20
  • 100+20% → 120
  • 100-20% → 80
  • 12.5 200 → 6.25%
  • 12.5%200 → 25
  • 1,000+20% → 1200
  • 2,500 10,000 → 25%
  • -50 200 → -25%

The tool supports decimals, negative numbers, and large values with commas.

Practical Use Cases and Common Scenarios

This calculator can help in many everyday situations where percentage calculations are needed.

  • Shopping discounts – quickly see the final price after a percentage discount.
  • Price increases – calculate how much a product or subscription increases by a percentage.
  • Grade calculations – find what percent a score represents out of the total points.
  • Financial adjustments – estimate percentage changes in budgets, expenses, or investments.
  • Data comparisons – understand how one value compares to another in percentage terms.
  • Statistics and reports – quickly convert values into percentages when reviewing data.

Because the tool accepts decimals and negative values, it can also handle more precise or unusual scenarios.

Frequently Asked Questions

What types of percentage calculations does this tool support?

This calculator can determine what percent one number is of another, calculate a percent of a number, and compute percentage increases or decreases.

How do I calculate what percent one number is of another?

Enter two numbers separated by a space. For example, entering 20 100 will return 20%.

How do I calculate a percentage of a value?

Include the percent sign before the second number. For example, entering 20% 100 will return 20, which is 20 percent of 100.

How do I calculate a percentage increase or decrease?

Use plus or minus with a percentage. For example, 100+20% increases 100 by 20 percent, while 100-20% decreases 100 by 20 percent.

Can I use decimals or negative numbers?

Yes. The calculator supports decimals and negative numbers, which allows you to handle more precise calculations or values that represent decreases or losses.