Percentage Calculator

Percentage Calculator Free Online Tool

Our percentage calculator free online tool gives you instant answers for everyday percentage problems. Enter your numbers, pick the type of calculation, and the result appears right away. There is nothing to install and no sign-up, and everything runs directly in your browser, so your numbers stay private.

How to Calculate Percentage of Two Numbers

If you are wondering how to calculate percentage of two numbers, the formula is simple: divide the part by the whole, then multiply by 100. Here is the idea written as code:

percentage = (part / whole) × 100

For example, 25 out of 200 is (25 ÷ 200) × 100 = 12.5%. Type those two values into the calculator and it will show the same answer, so you can check your own working.

Percentage Change Calculator Free

Use this percentage change calculator free of charge to see how much a value has grown or dropped between an old number and a new one. The formula is:

change % = ((new − old) / old) × 100

A positive result means an increase and a negative result means a decrease. For instance, going from 100 to 80 is a 20% decrease, while going from 80 to 100 is a 25% increase. The percentages differ because the starting value is different. If you are tracking prices, grades or traffic, this is the quickest way to compare two periods.

How to Work Out Percentage Discount

Shopping and want to know how to work out percentage discount? Subtract the sale price from the original price, divide by the original price, and multiply by 100. If a jacket was $80 and is now $60, the discount is (20 ÷ 80) × 100 = 25%.

You can also work backwards. To find the sale price of a $50 item with 20% off, take 20% of 50 ($10) and subtract it, which leaves $40. Use the calculator to confirm the numbers before you buy, or to set discounts for your own store.

Calculate Percentage Increase Between Two Numbers

To calculate percentage increase between two numbers, subtract the original value from the new value, divide by the original value, and multiply by 100. If your monthly visitors rise from 1,200 to 1,500, the increase is (300 ÷ 1,200) × 100 = 25%.

This works for salary raises, rent changes, savings growth, website traffic and more. Always divide by the original number, not the new one. That is the most common mistake people make by hand.

Free Online Percentage Calculator for Marks

Students can use this free online percentage calculator for marks to turn exam scores into percentages. Enter the marks you scored and the total marks available. For example, 432 out of 500 is (432 ÷ 500) × 100 = 86.4%.

To find your overall percentage across several subjects, add up all the marks you scored, add up all the total marks, and divide one by the other. Teachers can also use it to grade quickly and compare results between classes.

Handy Tools for Your Next Project

Working on a website or a design as well? Build matching colors with our Color Palette Generator, add a custom site icon with the Favicon Generator, or share a link on flyers with the QR Code Generator. For secure accounts, try the Random Password Generator, and for developers there is the UUID Generator.

Tips for accurate percentages

• Always check which number is the "whole" and which is the "part" before you calculate.
• For percentage change, divide by the original (old) value.
• Percentage increase and decrease are not symmetrical: +25% then −25% does not return you to the start.
• Round only at the end to avoid small errors in your result.

Frequently asked questions

Is this percentage calculator really free? Yes. It is free, requires no registration, and has no usage limits.

Is my data uploaded anywhere? No. The numbers you enter stay in your browser.

Can I calculate a percentage decrease too? Yes. A negative result in the percentage change calculation is a decrease.

Can I use it for exam marks and grades? Yes. Enter your score and the total marks to get your percentage instantly.