What is a percentage anyway?
A percentage is just a way to express a number as a fraction of 100. The word literally means "per hundred". For example, 45% simply means 45 out of 100.
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Percentage Calculator
A fast, simple percentage calculator. No ads, no popups, and no tracking cookies.
Calculate Percentage Portion
Calculate Percentage Rate
Calculate Percentage Change (Increase/Decrease)
How to calculate percentages yourself
1. Finding the amount
To find a percentage of a number, divide the percentage by 100 and multiply it by the total amount. Useful for calculating sales tax or discounts.
Formula:
Amount = (Percentage / 100) × Total
Example: 15% of 200? (15 / 100) × 200 = 30
2. Finding the percentage
To find what percent one number is of another, divide the part by the whole number and multiply the result by 100.
Formula:
Percent = (Part / Whole) × 100
Example: 50 is what percent of 200? (50 / 200) × 100 = 25%
3. Finding the percentage change
To find the difference between two values as a percentage, subtract the old value from the new value, divide the result by the old value, and multiply by 100.
Formula:
Change % = ((New - Old) / Old) × 100
Example: Changing from 100 to 150? ((150 - 100) / 100) × 100 = 50%
Frequently Asked Questions
How do I calculate a 15% tip?
Move the decimal point of your bill one spot to the left (which gives you 10%), cut that number in half (which gives you 5%), and add them together. Or, just multiply your bill by 0.15. For example, a 15% tip on $40 is $40 × 0.15 = $6.00.
What does a negative percentage change mean?
It just means the value has decreased. For example, if an item's price goes down from $100 to $80, the price dropped by 20%, so the percentage change is -20%.
Why we built this tool
Most percentage calculators online are cluttered with popups, banner ads, and tracking cookies that follow you across the web. We wanted to build a clean, fast, and simple tool that just works.
Percentcal.net is completely free, ad-free, and cookie-free. We do not track your calculations or collect your personal data. Whether you are calculating discounts, tipping at a restaurant, analyzing financial changes, or working on math homework, you can get your answers instantly without any distraction.
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