How Long to Upload 100 GB at 1 Gbps?
With a 1 Gbps upload connection, a 100 GB file takes approximately 13m 39s under ideal conditions.
What 100 GB at 1 Gbps actually means
A 100 GB file is roughly the size of a finished 4K video project, a AAA game install, or an entire photo library — the kind of transfer you'd do when cloud backup to Backblaze or handing off project files to an editor. At 1 Gbps (gigabit-class fiber), This is a top-tier symmetrical fiber connection. Upload time is rarely a concern at this speed; your storage drive or the receiving server is usually the real limit.
For a transfer this long, a wired Ethernet connection instead of Wi-Fi will keep the speed steady and prevent stalls that restart chunks.To move a file this size in under an hour, you'd need at least 284.4 Mbps of real-world upload speed.
Why does a 100 GB upload take 13m 39s at 1 Gbps?
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 1 Gbps: 102,400 MB × 8 ÷ 1000 Mbps = 819 seconds ≈ 13m 39s
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 17m 4s. 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 1 Gbps
Upload 100 GB at other speeds
Other file sizes at 1 Gbps
Need custom calculations?
Use our interactive Upload Time Calculator for any file size, speed, and efficiency rate.
Open Upload Time Calculator →