Factorial Calculator

Precision meets simplicity with our Factorial Calculator. Ideal for users of all levels, this tool guarantees swift and accurate factorial calculations.

factorial calculator

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A factorial calculator simplifies the calculations by swiftly computing the product of an integer and all the integers below it.

What is a Factorial Calculator?

A factorial calculator is a tool that solves math problems involving factorials. Factorials are about multiplying numbers together in a special way. If you have to find the factorial of a number, like 5!, you multiply every whole number from 1 up to that number.

So, 5! means doing 5 x 4 x 3 x 2 x 1, which equals 120.

This online calculator does the work fast and easy. You type in any positive integer, and it shows you the answer right away. It’s great for schoolwork or other projects where you need to use factorials.

With this tool, there’s no need to do all the multiplication by hand!

Understanding Factorials

Understanding factorials is a journey into the fundamental building blocks of mathematics, where we encounter the intriguing factorial function. This unique mathematical formula showcases how a single number can exponentially amplify as it multiplies by each preceding whole number down to one, revealing patterns and properties that are pivotal across various fields within mathematics.

The factorial function is represented by the symbol!

The symbol “!” stands for the factorial function in math. When you see this symbol after a number, it means you should multiply that number by all smaller positive numbers down to one.

For example, if you have 4!, that’s the same as saying 4 times 3 times 2 times 1, which equals 24. This function is important because it helps solve many kinds of problems in fields like calculus and algebra.

You can’t use the factorial function with negative numbers – it won’t work. But there’s something special about zero; when you look at 0!, it always equals just one (1). Remembering these rules makes using factorials easier and helps avoid mistakes when doing math problems that involve them. Navigate octal math effortlessly! Streamline your calculations with our Octal Math Calculator.

The formula for factorial calculation

Factorial formula

You can find the factorial of a whole number with a simple formula. It goes like this: n! = n x (n-1) x (n-2) x .. x 1. That means if you have a number like 5, you multiply it by each whole number less than it, all the way down to 1.

So, 5! equals 5 times 4 times 3 times 2 times 1, which is equal to 120.

Some numbers are special cases when talking about factorials. Zero is one of these because its factorial is always one. Remember, you can’t take the factorial of negative numbers – they just don’t work in this formula! Now let’s move on and see how we use this function with an online calculator for finding factorials easily.

Special cases of factorial calculation (negative and zero factorials)

Factorials are like building blocks, stacking from one up to a number. But there’s no stack for negative numbers; factorials don’t work with them. Think of it as trying to build a tower down into the ground—it just doesn’t make sense! Factorial formulas need whole, positive numbers.

There is an exception though: zero. Even though you might think you can’t multiply by zero, in factorials, zero is special. If we say 0!, it’s not anything at all—it’s actually 1.

This rule helps mathematicians keep their equations tidy and makes sure everything works out when they’re counting or arranging things in different ways. Explore the world of modular arithmetic effortlessly! Simplify complex calculations with our Modulo Calculator.

How to Use a Factorial Calculator

Discovering the functionality of a factorial calculator can streamline your mathematical journey, effortlessly handling complex calculations and offering instant results for any non-negative number you wish to explore further.

Simple factorials


factorial calculator helps you find the product of all whole numbers up to a certain number. This is how it works: if you have 5!, you multiply 5 by 4, then by 3, then by 2, and finally by 1.

It might sound like a lot but the calculator does this fast. For example, with our tool, type in ‘5’ and it quickly tells you that 5! equals 120.

Even for bigger numbers or when working with prime numbers, the process stays the same. You just keep multiplying all the way down to one. Our calculator also handles special cases like finding out what 0! is — remember from our facts that it’s always equal to 1.

So don’t worry about big digits or scientific notation; leave that to the calculator while you focus on your math problem or homework. Experience the precision of binary math with ease! Optimize your calculations using our Binary Math Calculator.

Addition, subtraction, multiplication, and division of factorials

After learning about simple factorials, let’s dive into how they can be combined through addition, subtraction, multiplication, and division. Factorial calculations can get tricky, but don’t worry. 

     1. Adding two factorials:

  • To add factorials, simply calculate each factorial separately and then add the results.
  • For example, (4!) + (5!) means you calculate 4! (which is 24) and 5! (which is 120) and then add them to get a total of 144.

      2. Subtracting one factorial from another:

  1. Just like addition, calculate both factorials first.
  2. If you have (7!) – (5!), find the value of 7! (5040) and 5! (120), then subtract the second from the first to get your answer: 4920.

      3. Multiplying factorials together:

  • Start by finding the value of each factorial.
  • A multiplication such as (3!) * (4!) involves calculating 3! (6) and multiplying it by 4! (24), giving you a product of 144.

      4. Dividing one factorial by another:

  • Divide after computing both values individually.
  • With a division like (6!) / (3!), find out what 6! equals which is 720, and divide this by what you get from calculating 3!, which is six to get a result of 120.
  • The expression ((k+1)! + (k+1)!) can be simplified by doubling the result of ((k+1)!)


1. How do you calculate a factorial using Excel?

To calculate a factorial in Excel, use the FACT function. For example, “=FACT(5)” calculates the factorial of 5. Simply replace the number with the desired value.

2. Can this calculator handle negative factorials?

No, this calculator is designed for non-negative integers only. Negative factorials are undefined in standard mathematics.

3. Are there any permuted calculations this tool can help with?

Yes, our Factorial Calculator is versatile and can assist with permutations. Simply input the values and use the results for your permutation calculations.

5. Could you explain simple arithmetic operations involving factorials?

Certainly! You can perform standard arithmetic operations like addition, subtraction, multiplication, and division with factorials. For example, “5! + 3!” calculates the sum of the factorials of 5 and 3.

6. How does this tool handle mathematical formulas involving permutations?

Our calculator accommodates mathematical formulas involving permutations. Input the values accordingly, and the tool will provide the factorial results for your permutation calculations.

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