How long does it take to download 100 GB at 300 Mbps?
44 min 27 sec Theoretical minimum at full line rate (37.5 MB/s), real downloads typically run 5–15% slower. Edit the calculator and this updates live.
Mbps vs MB/s, why the math says 44 min 27 sec
Internet plans are sold in megabits per second (Mbps, small b). File sizes are shown in megabytes (MB, big B). One byte is 8 bits, so a 100 Mbps connection moves at most 12.5 MB of file data per second, divide your plan speed by 8 to get the number your download manager shows.
That factor of 8 is why a "100 meg" plan doesn't download a 100 MB file in one second: it needs 8 seconds in theory, and a little more in practice once protocol overhead (typically 5–15%), Wi-Fi conditions, and server limits are counted.
time = (100 GB × 8 bits/byte) ÷ 300 Mbps = 44 min 27 sec
100 GB at every common speed
| Connection speed | Download time |
|---|---|
| 5 Mbps | 1 day 20 hr 26 min |
| 10 Mbps | 22 hr 13 min 20 sec |
| 25 Mbps | 8 hr 53 min 20 sec |
| 50 Mbps | 4 hr 26 min 40 sec |
| 100 Mbps | 2 hr 13 min 20 sec |
| 200 Mbps | 1 hr 6 min 40 sec |
| 300 Mbps (this page) | 44 min 27 sec |
| 500 Mbps | 26 min 40 sec |
| 1 Gbps | 13 min 20 sec |
Other file sizes at 300 Mbps
| File size | Download time |
|---|---|
| 100 MB | 3 sec |
| 250 MB | 7 sec |
| 500 MB | 13 sec |
| 1 GB | 27 sec |
| 2 GB | 53 sec |
| 5 GB | 2 min 13 sec |
| 10 GB | 4 min 27 sec |
| 20 GB | 8 min 53 sec |
| 50 GB | 22 min 13 sec |
| 100 GB (this page) | 44 min 27 sec |
| 250 GB | 1 hr 51 min 7 sec |
| 500 GB | 3 hr 42 min 13 sec |
| 1 TB | 7 hr 24 min 27 sec |
| 2 TB | 14 hr 48 min 53 sec |
Frequently asked questions
How long does 100 GB really take at 300 Mbps?
The theoretical minimum is 44 min 27 sec. Real downloads lose 5–15% to protocol overhead, Wi-Fi conditions, and server throttling, so plan on roughly 48 min 53 sec to 51 min 7 sec.
What is 300 Mbps in MB/s?
300 megabits per second equals 37.5 megabytes per second (divide by 8, because one byte is 8 bits). Your download manager reports MB/s, which is why the number looks smaller than your plan speed.
What speed do I need to download 100 GB in under 10 minutes?
At least 1,334 Mbps of real throughput. Add ~10% headroom for overhead when choosing a plan.
How long would 100 GB take on gigabit (1 Gbps)?
13 min 20 sec, about 3× faster than 300 Mbps.