Enter your file size and download speed to find out exactly how long a download will take. Set the file size unit (KB, MB, GB, or TB), your connection speed unit (Kbps, Mbps, or Gbps), and an optional network overhead percentage to account for real-world TCP inefficiency. You get back the estimated download time broken down into hours, minutes, and seconds.
Estimated Download Time
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Total Seconds
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Effective Speed
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File Size in Megabits
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Download time is calculated by dividing the file size (converted to bits) by the effective download speed (in bits per second). The formula is: Download Time = File Size in Bits ÷ Effective Speed in bps. Network overhead, such as TCP/IP protocol overhead, further reduces the usable bandwidth, so applying a 10% overhead factor gives a more realistic estimate.
Mbps stands for Megabits per second, while MBps stands for Megabytes per second. Internet speeds are almost always advertised in Mbps (bits). Since 1 byte equals 8 bits, a 100 Mbps connection transfers roughly 12.5 MBps of actual data. Confusing the two is one of the most common reasons people underestimate download times.
Several factors can slow a download below your advertised speed: network congestion on your ISP's infrastructure, Wi-Fi signal quality, server-side bandwidth limits, TCP/IP protocol overhead (typically 10%), the number of simultaneous connections on your network, and the geographic distance to the server you're downloading from.
On a 100 Mbps connection with 10% TCP overhead, a 20 GB file (160,000 Mb) would take roughly 29.6 minutes. On a 1 Gbps (1000 Mbps) fiber connection the same file would download in about 3 minutes. Use this calculator with your actual speed to get a personalized estimate.
Network overhead refers to the extra data that communication protocols (like TCP/IP) add to manage the connection — acknowledgements, headers, error checking, etc. Typical TCP overhead is around 10%, meaning a 100 Mbps link effectively delivers about 90 Mbps of useful data. Including it gives you a more realistic download time than using the raw advertised speed.
You can improve download speeds by connecting via Ethernet instead of Wi-Fi, closing background apps that consume bandwidth, using a download manager that opens multiple connections, choosing a server geographically closer to you, or upgrading your internet plan. Restarting your router can also help if speeds have degraded over time.
Simply enter the game's file size (e.g. 100 GB for a large title) and your current download speed. For example, on a 50 Mbps connection with 10% overhead, a 100 GB game would take approximately 4.9 hours. This calculator lets you quickly compare how much faster a faster plan would complete the download.
The calculator assumes you are using your full advertised bandwidth. In reality, multiple devices may share your connection, the source server may throttle speeds, or your Wi-Fi signal may be weak. Try the calculator with a lower speed reflecting what a speed test actually measures for a more accurate estimate.