Download Time Calculator
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How long will that game, film or backup take? Enter the file size and your internet speed, and the calculator shows the download time — plus how long it would take at a few common speeds.
How the calculation works
| Step | Formula |
|---|---|
| Convert size to megabits | Size in GB × 8,000 = megabits (1 GB = 1,000 MB, 1 byte = 8 bits) |
| Divide by speed | Megabits ÷ speed in Mbps = seconds |
| Example | 50 GB at 100 Mbps: 400,000 ÷ 100 = 4,000 s ≈ 1 h 7 min |
Real downloads are often a little slower than the line speed, because the server, Wi-Fi and other traffic all play a part.
How the calculation works
The calculator converts the file size to bits and divides by your speed. A 50 GB game is 400,000 megabits; at 100 Mbps that's 4,000 seconds, or about 1 hour 7 minutes. At 300 Mbps it's about 22 minutes, and at 1 Gbps about 7 minutes. The comparison row shows the same file at common plan speeds, so you can see what an upgrade would actually change.
Why downloads take longer than calculated
The calculation assumes your full speed is used the whole time. In practice the download server may be slower than your connection — especially on launch days, when millions of people want the same game. Wi-Fi may cap your speed well below your plan, and other devices share the line. A download over weak Wi-Fi, with a 4K stream running in another room, can easily take twice as long as calculated.
Use your real speed
For the most realistic estimate, enter the speed you actually get rather than your plan's "up to" figure. Run the speed test on the device that will do the download, in the same spot, and use that number. On a cable it will be close to your plan; on Wi-Fi it may be much lower.
Megabytes, gigabytes and bits
File sizes use bytes (MB, GB); speeds use bits (Mbps). One byte is eight bits, so divide your Mbps by 8 to get megabytes per second. Some systems count 1 GB as 1,024 MB — the difference is under 3 %. If you're unsure which unit a number is in, the Mbps to MB/s converter and Mbps vs MBps explain it.
Typical file sizes
As a rough guide: a phone photo is a few megabytes, a song around 5–10 MB, an HD film 1–5 GB, a 4K film 15–25 GB, and big modern games 50–150 GB, with updates of several gigabytes. Phone and computer system updates range from hundreds of megabytes to several gigabytes.
Uploads work the same way
The same maths applies to uploads — sending a video, backing up photos — using your upload speed instead. Because upload is usually much slower than download, a backup can take many times longer than downloading the same data. Check yours with the upload speed test.
Speeding up big downloads
Use a cable, pause other downloads and streams, and schedule large downloads overnight so they don't slow everyone else. If downloads are regularly too slow for your household, see is 1 Gbps worth it or is 300 Mbps fast.