Download Time Calculator
Enter a file size and your connection speed to estimate the download time.
Connection speeds are in megabits per second (Mbps); file sizes are usually shown in megabytes (MB) — 1 byte equals 8 bits.
How download time is estimated
This calculator converts your file size from megabytes to megabits (multiplying by 8, since 1 byte equals 8 bits), then divides by your connection speed in megabits per second to find the time in seconds — this matches how ISPs advertise connection speed (in bits) versus how file sizes are usually displayed (in bytes).
This gives a theoretical best-case estimate assuming your connection runs at its full advertised speed continuously. Real-world download speeds are almost always somewhat lower due to network overhead, server limitations, and other traffic sharing your connection.
Frequently asked questions
Why is my actual download slower than this estimate?
Real connections rarely sustain their full advertised speed continuously — factors like network congestion, Wi-Fi signal quality, server-side bandwidth limits, and overhead from the download protocol itself all reduce actual throughput below the theoretical maximum.
Why does the calculator multiply file size by 8?
Internet connection speeds are conventionally measured in bits per second (like Mbps), while file sizes are conventionally displayed in bytes (like MB). Since 1 byte = 8 bits, converting megabytes to megabits requires multiplying by 8.
What's a typical speed for different connection types?
This varies widely — basic broadband might offer 25-100 Mbps, while higher-end fiber connections can reach 1,000 Mbps (1 Gbps) or more. Check your specific internet plan's advertised speed for an accurate estimate.