Aspect Ratio Calculator

<html lang="en">
    <head>
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Aspect Ratio Calculator</title>
        
        <link
            href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap"
            rel="stylesheet"
        />
        
        <style>

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}
body {
    background-color: #895cf3;
}
.container {
    width: 500px;
    background-color: #ffffff;
    padding: 80px 40px;
    position: absolute;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    border-radius: 10px;
    box-shadow: 0 30px 45px rgba(18, 8, 39, 0.2);
}
h2 {
    text-align: center;
    font-size: 40px;
    line-height: 1.6;
    font-weight: 600;
    letter-spacing: 2px;
}
h2 span {
    color: #895cf3;
}
.wrapper-1 {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 50px 0 70px 0;
    gap: 10px;
}
.wrapper-1 input {
    width: 100px;
    font-size: 30px;
    font-weight: 600;
}
input {
    padding: 15px 10px;
    border: 1px solid #bbc0c5;
    border-radius: 5px;
    color: #170444;
    outline: none;
}
input:focus {
    border: 2px solid #895cf3;
}
label {
    color: #170444;
    font-weight: 600;
    letter-spacing: 0.6px;
}
.box {
    display: flex;
    justify-content: space-between;
    gap: 30px;
}
.wrapper-2,
.wrapper-3 {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.wrapper-2 input,
.wrapper-3 input {
    width: 100%;
    font-size: 18px;
}
        
        </style>
    </head>
    <body>
        <div class="container">
            <h2>
                <span>Aspect Ratio</span>
                Calculator
            </h2>
            <div class="wrapper-1">
                <input type="number" id="ratio-width" value="16" />
                <input type="number" id="ratio-height" value="9" />
            </div>
            <div class="box">
                <div class="wrapper-2">
                    <label for="width">Width:</label>
                    <input type="number" id="width" value="1280" />
                </div>
                <div class="wrapper-3">
                    <label for="height">Height:</label>
                    <input type="number" id="height" value="720" />
                </div>
            </div>
        </div>
        
        <script>

let ratioWidth = document.getElementById("ratio-width");
let ratioHeight = document.getElementById("ratio-height");
let width = document.getElementById("width");
let height = document.getElementById("height");

let calculateWidth = () => {
    let aspectRatio = ratioWidth.value / ratioHeight.value;
    width.value = parseFloat((height.value * aspectRatio).toFixed(2));
};

let calculateHeight = () => {
    let aspectRatio = ratioWidth.value / ratioHeight.value;
    height.value = parseFloat((width.value / aspectRatio).toFixed(2));
};

height.addEventListener("input", calculateWidth);
width.addEventListener("input", calculateHeight);
ratioHeight.addEventListener("input", calculateHeight);
ratioWidth.addEventListener("input", calculateHeight);

</script>
    </body>
</html>

demo

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Aspect Ratio Calculator