How Long to Upload 100 GB at 100 Mbps?

With a 100 Mbps upload connection, a 100 GB file takes approximately 2h 16m 32s under ideal conditions.

Why does a 100 GB upload take 2h 16m 32s at 100 Mbps?

Upload speed is measured in megabits per second (Mbps), while file size is measured in megabytes (MB) or gigabytes (GB). Since 1 byte = 8 bits, you divide your file's size in megabytes by your speed in megabits, then multiply by 8 to get the transfer time in seconds.

For 100 GB (102,400 MB) at 100 Mbps: 102,400 MB × 8 ÷ 100 Mbps = 8,192 seconds ≈ 2h 16m 32s

In practice, network overhead, protocol headers, and ISP throttling reduce effective throughput to about 80% of your advertised speed — making the realistic upload time closer to 2h 50m 40s. If you're on Wi-Fi instead of Ethernet, expect even longer due to signal interference.

100 GB upload time at different speeds

Different file sizes at 100 Mbps

Upload 100 GB at other speeds

Other file sizes at 100 Mbps