The Ultimate
Percentage Calculator
Instantly calculate percentages, percent changes, and differences. No math skills required. Fast, responsive, and completely free to use.
What is X% of Y?
Result
X is what % of Y?
Result
Percentage Change
Result
Percentage Difference
Result
Explore More Calculators
We offer a wide variety of specific, tailored calculators for students, investors, freelancers, and everyday math problems.
GPA Calculator
Quickly calculate your high school or college Grade Point Average.
Final Exam Calculator
Find out exactly what grade you need on your final exam to pass.
Gradebook Calculator
Manage classroom grades and weigh assignments effortlessly.
Negative Marking Calculator
Calculate exam scores accounting for penalties on incorrect answers.
Stock Average Calculator
Find the average cost of your shares after multiple purchases.
Stock Average Down
Calculate how many shares you need to buy to lower your average cost.
DCA Calculator Tool
Dollar Cost Averaging calculator for smart, long-term investing.
Profit/Loss Calculator
Easily figure out your business margins, net profit, and loss percentages.
Freelance Profit
Calculate hourly rates, project margins, and freelance take-home pay.
Payment Percentage
Determine processing fees and split payments accurately.
% Change Calculator
Dedicated tool to find the exact percentage shift between two values.
% Increase Calculator
Add a specific percentage to an initial number for markups and taxes.
% Difference Calculator
Compare two positive numbers to find the relative difference between them.
Recipe Ingredient Tool
Scale recipes up or down using Baker's percentages perfectly.
Lithium Battery Tool
Calculate charge capacity, runtime percentages, and battery health.
Comprehensive Guide: How to Calculate Percentages
Welcome to the internet's most accurate and user-friendly percentage calculator. Whether you're calculating a discount on a sale, trying to figure out your test score, analyzing financial growth, or simply trying to calculate percentage for everyday math, this guide and our suite of tools have you covered.
What is a Percentage?
In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%". For example, 45% (read as "forty-five percent") is equal to 45/100, or 0.45. Using a reliable percent calculator eliminates manual errors and saves time in your daily workflow.
How to Get a Percentage of a Number
One of the most common questions we see is: "How do I find out the percentage of a number?" The process is straightforward if you know the formula. To calculate the percentage of a specific number, you multiply the number by the percentage fraction.
Formula: (Percentage / 100) × Base Number = Result
Example: What is 20% of 150?
- Convert 20% to a decimal: 20 / 100 = 0.20
- Multiply by the base number: 0.20 × 150 = 30
If you prefer not to do manual math, just use the first tab of our free percentage calculator at the top of this page!
How to Calculate Percentage Change Between Two Numbers
When tracking data over time—such as website traffic, stock prices, or weight loss—you need a percentage change calculator. This metric tells you the degree of change over time, showing you not just the raw numbers, but the relative momentum.
Formula: ((New Value - Old Value) / |Old Value|) × 100 = % Change
If the result is positive, you have a percentage increase. If the result is negative, it represents a percentage decrease. For highly specific tracking, check out our dedicated Percentage Change Calculator.
How to Calculate Increase Percentage
Adding a markup, calculating sales tax, or tipping at a restaurant all require understanding percentage increase. If you want to calculate the final amount after an increase, you multiply the original amount by 1 plus the decimal of the percentage.
For example, to add a 15% tip to a $40 bill: $40 × 1.15 = $46. You can streamline this process by using our Percentage Increase Calculator, which does the heavy lifting for retail markups and tax adjustments.
How to Calculate a Percent Difference Between Two Numbers
Often confused with percentage change, the percentage difference calculator is used when comparing two separate, distinct values where neither is obviously the "old" or "new" value (e.g., comparing the heights of two mountains or the costs of two different cars). It uses the absolute difference divided by the average of the two numbers.
Formula: (|Value 1 - Value 2| / ((Value 1 + Value 2) / 2)) × 100
Avoid the complex division by using our specialized Percentage Difference Calculator tool.
Real World Applications
Our calculators aren't just for math class. They are vital for everyday decisions:
- Investing: Use our Stock Average Calculator and Average Down Calculator to manage your portfolio efficiently. Don't forget our DCA Tool for long-term strategies.
- Business: Freelancers love our Freelance Profit Calculator. If you run a small shop, the Profit/Loss Calculator and Payment Percentage Calculator are must-bookmarks.
- Education: Students and teachers utilize our GPA Calculator, Final Exam Calculator, and Gradebook Calculator every semester. We even have a Negative Marking Calculator for strict competitive exams.
- Hobbies: Cooking a big meal? Try the Recipe Ingredient Calculator. Building electronics? See the Lithium Battery Calculator.