Download time calculator

Enter a file size and your internet speed to see roughly how long a download should take. This is the best case, at full speed. Real downloads often take longer, and the reasons are below. Nothing you type leaves this page.

Megabits vs. megabytes: the 8× thing

Internet speed is measured in bits (Mb, megabits). File sizes are measured in bytes (MB, megabytes). There are 8 bits in a byte. So a 100 Mbps connection moves about 12.5 megabytes per second at best, not 100. Watch the lowercase b (bits) vs. capital B (bytes).

1 byte = 8 bits

Why your download probably takes longer

• Wi-Fi is usually slower than a wired connection, and it drops off with distance and walls.
• Other people and devices on your network share the same connection.
• The server you're downloading from may be slower than your connection, or busy.
• Older devices, routers, or Wi-Fi bands can cap your speed.
• Your plan's speed is usually an "up to" number. Run a speed test near the router and put the result in the optional box for a more realistic estimate.

Estimates only. We don't measure your connection, and nothing you type leaves this page.

Related: Why is my Wi-Fi slow?, 2.4 vs 5 GHz, Restart the router the right way, How much storage do I need?, Is this website down, or is it me?

Paying for fast internet but downloads still crawl? I can connect remotely and figure out where the slowdown is. Support is after-hours, nationwide, with local help in the Dallas–Fort Worth area. Details are on the Work with me page.