diff --git a/Factorial-Calculator/README.md b/Factorial-Calculator/README.md
new file mode 100644
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+++ b/Factorial-Calculator/README.md
@@ -0,0 +1,33 @@
+# FACTORIAL CALCULATOR
+
+---
+
+## **Description 📃**
+
+- This project is made by using HTML, CSS and JS.
+- This project can calculate factorial of the very large numbers.
+- This project is responsive towards the small devices also.
+
+
+
+## **Functionalities 🎮**
+
+- Enter the number you want to know the factorial of that number.
+- Project will calculate and show the answer instantly.
+- Best front-end project.
+
+
+
+## **ScreenShot 📸**
+
+![image](https://github.com/shrey141102/Javascript-projects/assets/114330097/1c3e626e-40b3-4ee3-9f0c-ab92263d39c3)
+
+
+
+## **Developed By 👦**
+
+[Avdhesh Varshney](https://github.com/Avdhesh-Varshney)
+
+
+
+### **Happy Coding 🧑💻**
diff --git a/Factorial-Calculator/index.html b/Factorial-Calculator/index.html
new file mode 100644
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+++ b/Factorial-Calculator/index.html
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+
+
+
+
+
+
+
+ Large Factorial Calculator
+
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+
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diff --git a/Factorial-Calculator/script.js b/Factorial-Calculator/script.js
new file mode 100644
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+++ b/Factorial-Calculator/script.js
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+// Initialising variables
+const input = document.querySelector('input');
+const output = document.getElementById('show-output');
+
+// Take input from the user
+input.addEventListener('input', () => {
+ if (input.value !== '') {
+ let num = parseInt(input.value);
+ calcFactorial(num);
+ } else {
+ output.textContent = '';
+ }
+});
+
+// Function which calculate the factorial of the entered number
+function calcFactorial(n) {
+ let len = 1;
+ let num = [1];
+
+ // Main algorithm of calculating the large number factorial
+ for (let i = 1; i <= n; i++) {
+ let c = 0;
+ for (let j = 0; j < len; j++) {
+ let k = num[j] * i + c;
+ num[j] = k % 10;
+ c = Math.floor(k / 10);
+ }
+ while (c) {
+ num.push(c % 10);
+ c = Math.floor(c / 10);
+ len++;
+ }
+ }
+
+ let result = '';
+ for (let i = num.length - 1; i >= 0; i--)
+ result += num[i];
+
+ // Showing result to the user
+ output.textContent = result;
+}
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diff --git a/Factorial-Calculator/style.css b/Factorial-Calculator/style.css
new file mode 100644
index 0000000..66fd0a7
--- /dev/null
+++ b/Factorial-Calculator/style.css
@@ -0,0 +1,150 @@
+/* Default settings */
+* {
+ margin: 0;
+ padding: 0;
+ box-sizing: border-box;
+ align-items: center;
+ text-align: center;
+ overflow: hidden;
+ font-family: cursive;
+}
+
+.box1,
+.box2 {
+ position: absolute;
+ width: 100%;
+ height: 100%;
+ transition: all 0.5s;
+}
+
+.box1 {
+ top: 0;
+ background-color: salmon;
+ transform: rotateY(0deg) rotate(45deg);
+}
+
+.box2 {
+ bottom: 0;
+ background-color: lightgreen;
+ transform: rotateY(45deg) rotate(145deg);
+}
+
+/* Styling the main container */
+.container {
+ background-color: rgba(255, 255, 255, 0.6);
+ width: 50%;
+ height: 90%;
+ border: none;
+ border-radius: 0.5rem;
+ position: absolute;
+ top: 50%;
+ left: 50%;
+ transform: translate(-50%, -50%);
+ transition: all 0.5s;
+}
+
+/* Styling the heading */
+h1 {
+ font-size: 2.5rem;
+ font-weight: normal;
+ color: green;
+ user-select: none;
+ margin: 1rem 0;
+ transition: all 0.5s;
+}
+
+/* Styling the paragraph element nested inside the container */
+.container>p {
+ color: red;
+ font-size: 1.2rem;
+ margin-top: 0.5rem;
+ user-select: none;
+ transition: all 0.5s;
+}
+
+a {
+ text-decoration: none;
+ color: red;
+}
+
+a:hover {
+ text-decoration: underline;
+}
+
+/* Styling the input box */
+input {
+ margin: 2rem 0;
+ width: 60%;
+ height: 10%;
+ font-size: 2rem;
+ border: none;
+ border-radius: 0.75rem;
+ outline: none;
+ padding: 15px;
+ background: transparent;
+ transition: all 0.5s;
+}
+
+/* Removing the spinner of the number input box */
+input[type='number']::-webkit-inner-spin-button,
+input[type="number"]::-webkit-output-spin-button {
+ -webkit-appearance: none;
+ margin: 0;
+}
+
+/* Styling the output box */
+#output {
+ font-size: 1.5rem;
+ color: #9C27B0;
+ width: 96%;
+ margin: 0 2%;
+ height: 55%;
+ overflow: auto;
+ /* Wrap the answer into a fixed container */
+ transition: all 0.5s;
+}
+
+#output p {
+ word-wrap: break-word;
+}
+
+/* Responsiveness of the website */
+@media (max-width: 900px) {
+ h1 {
+ font-size: 1.5rem;
+ }
+
+ .container>p {
+ font-size: 1rem;
+ }
+
+ input {
+ font-size: 1.5rem;
+ margin: 1.5rem 0;
+ }
+
+ #output {
+ font-size: 1rem;
+ height: 65%;
+ }
+}
+
+/* For small devices */
+@media (max-width: 450px) {
+ h1 {
+ font-size: 1rem;
+ }
+
+ .container>p {
+ font-size: 0.7rem;
+ }
+
+ input {
+ margin: 1.5rem 0;
+ }
+
+ #output {
+ font-size: 1rem;
+ height: 68%;
+ }
+}
\ No newline at end of file
diff --git a/script.js b/script.js
index 5fa7393..cd3a6ee 100644
--- a/script.js
+++ b/script.js
@@ -372,6 +372,11 @@ const projects = [
discription: "This a simple project where i created a amplification wave of the sound using only html, css and js, which can be shows according to the pitch of the user's sound.",
link: "AudioAnalyser/index.html",
image: "https://github.com/shrey141102/Javascript-projects/assets/114330097/1f68df5e-b745-43a7-a63a-d55211694848"
+ },
+ { title: "Factorial Calculator",
+ discription: "This project can calculate factorial of the very large numbers.",
+ link: "Factorial-Calculator/index.html",
+ image: "https://github.com/shrey141102/Javascript-projects/assets/114330097/1c3e626e-40b3-4ee3-9f0c-ab92263d39c3"
}
];