GB and Gb differ by a factor of eight
File sizes are normally expressed in bytes while network speeds are expressed in bits. Multiplying the byte-based size by eight is the key conversion behind the estimate.
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Enter the file size and transfer speed to estimate how long the transfer will take. For example, 10 GB at 100 Mbps is theoretically about 13 min 20 sec.
Enter file size and transfer speed to estimate how long the transfer will take. It answers questions such as “roughly how long should 10 GB take at 100 Mbps?”
Real transfers are slower because of Wi-Fi quality, congestion, protocol overhead and server limits. Treat the result as a best-case reference rather than a promise.
File sizes are normally expressed in bytes while network speeds are expressed in bits. Multiplying the byte-based size by eight is the key conversion behind the estimate.
The calculator uses 1 GB = 1,000,000,000 bytes. That is slightly different from binary GiB, so an operating system’s displayed size may not match the estimate exactly.
Plan speed and negotiated link speed are upper bounds. For a practical estimate, enter a speed measured on the same network path you expect to use.
For cloud backups or sending a large file, use the connection’s upload Mbps rather than its download Mbps. The two can be very different on some services.