WOW Webtools

Calculator

Percentage Calculator

Calculate percentages, increases, decreases, percentage differences, and parts of a whole instantly.

Tool statusWorks in browserNo account needed

Functional calculator

Percentage Calculator

Enter your numbers and get a quick browser-based result. Use important results as estimates and double-check anything official.

1. Find what percent one number is of another

Example: What percent is 20 of 80?

2. Find percentage increase or decrease

Example: What is the percentage change from 80 to 100?

Result

Question 1: What percent is 20 of 80?
Answer: 20 is 25.00% of 80

Question 2: What is the percentage change from 80 to 100?
Answer: 25.00% increase

Helpful examples based on 80
10% of 80 = 8.00
25% of 80 = 20.00
Download result
This tool has two separate sections. Use the first section to find what percent one number is of another. Use the second section to find percentage increase or decrease.

Tool guide

How to use the Percentage Calculator

Use the Percentage Calculator to find what percent one number is of another, calculate percentage increase or decrease, compare discounts, check sale prices, estimate tips, review grade percentages, and quickly answer everyday questions like ‘what is 20% of 80?’ or ‘how much did this number increase?’

People also use this tool for

People also use this percentage calculator to check sale prices, calculate tips, compare grade percentages, estimate tax, work out invoice changes, find percentage increase or decrease, compare old and new prices, and answer quick questions like “what percent is 25 of 200?” or “what is 20% off $80?”

What this tool is useful for

  • Calculate what percent one number is of another, such as what percent 25 is of 200.
  • Check discounts, sale prices, tax, tips, and questions like what is 20% off or what is 15% of a bill.
  • Compare percentage increase, percentage decrease, percentage difference, grade percentages, and everyday number changes.

Practical example

Try questions like what percent is 25 of 200, what is 20% off a $80 price, how much did a value increase from 50 to 65, or what percentage grade you earned from 42 correct answers out of 50.

Helpful tips

  • Use percentage increase when a number goes up and percentage decrease when a number goes down.
  • For sale prices, calculate the discount first, then subtract it from the original price.
  • For taxes, tips, grades, invoices, or official numbers, double-check the final result before relying on it.

Related tools and next steps

Calculators, Finance Tools, Converters, All Tools

Common questions this tool can help answer

Common questions this calculator can help answer

  • What percent is one number of another?
  • What is 20% of 80?
  • How do I calculate percentage increase?
  • How do I calculate percentage decrease?
  • How much is 20% off a sale price?
  • What percentage grade did I get?

Frequently asked questions

What does the Percentage Calculator do?

The Percentage Calculator helps you find what percent one number is of another, calculate percentage increase or decrease, compare discounts, check sale prices, estimate tax and tips, review grade percentages, and answer questions like what is 20% of 80 or what percent is X of Y.

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

Enter the part and the total to see the percentage. For example, if you got 42 questions correct out of 50, the calculator can show the grade percentage.

Can I use it for discounts and sale prices?

Yes. Use it to calculate sale discounts, what is 20% off, what a coupon saves, how much tax adds, or how much tip to leave on a bill.

What is the difference between percentage increase, decrease, and percentage difference?

Percentage increase shows how much a number went up, percentage decrease shows how much it went down, and percentage difference helps compare two values. These are useful for prices, grades, statistics, invoices, and everyday number changes.

https://wowwebtools.com/calculators/percentage-calculator