Java-Scripts.net

Bandwidth Calculator

Estimate transfer times. This tool converts file sizes and connection speeds into a readable time duration, helping users understand how long a download will take.

Copy the Script

<script>
function calculateDownloadTime() {
    var sizeMB = document.getElementById("mb").value;
    var speedMbps = document.getElementById("rate").value;
    
    // Convert to bits: (MB * 8) = Megabits
    var sizeMb = sizeMB * 8;
    
    // Time = Size / Speed
    var seconds = sizeMb / speedMbps;
    
    // Format Result
    var h = Math.floor(seconds / 3600);
    var m = Math.floor((seconds % 3600) / 60);
    var s = Math.floor(seconds % 60);
    
    alert("Estimated: " + h + "h " + m + "m " + s + "s");
}
</script>

<input type="number" id="mb" placeholder="Size in MB">
<select id="rate">
    <option value="10">10 Mbps</option>
    <option value="100">100 Mbps</option>
</select>
<button onclick="calculateDownloadTime()">Calc</button>

Frequently Asked Questions

File Size (in bits) divided by Connection Speed (in bits per second) equals Time (in seconds). Note: 1 Byte = 8 bits.

This calculator assumes a perfect, constant connection (theoretical max). Real-world speeds fluctuate due to network congestion, server load, and protocol overhead (approx 10%).

Yes. The dropdown values are customizable. Just ensure the value is consistently in Kilobits per second (Kbps) or another base unit for the formula to work.