Data Transfer Time Calculator
Estimate theoretical transfer time for data copies, backups, uploads, or downloads.
Estimate transfer duration
Estimated duration
—Formula and unit definitions
Time = data amount ÷ transfer rate after both values are normalized consistently. Decimal MB/GB/TB use base 1000; IEC MiB/GiB/TiB use base 1024. Mbps/Gbps are bits per second, while MB/s and GB/s are bytes per second.
Worked example
1 GB at 100 MB/s takes 10 seconds. 1 TB at 1 GB/s takes 1000 seconds.
Theoretical estimate
Results are theoretical estimates. Real transfers may be slower because of protocol overhead, server or device limits, Wi-Fi conditions, congestion, latency, and ISP behavior.